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GE GE-DS-82 Switch User Manual

1. m FIG 4 PART 6751547G11 SLEEVE PULLER COMM END Vertical Drilling Motor Type GE752 GEK 91584D FIG 2 PART 6751547610 SPACER PULLER COMM END FIG 5 PART 675154764 SLEEVE PULLER COMM END FIG 3 PART 675154766 BEARING PULLER COMM END 4 t 22 FIG 6 PART 6751547611 SLEEVE AND INNER RACE PULLER END s PRESSURECAP zo 23 FIG 16 PULLER TOOLS 410731569 CHG 0 14383 Reach into the drive end of the motor and dis connect grease tubes a On UP1 and AUP1 models disconnect two grease tubes 21 and 22 from the inner bear ing cap 51 Pull these tubes out through their hole in the frame The sealing RTV in the hole will separate with sufficient force b On UP2 and AUP2 models disconnect one grease tube 21 from the inner bearing cap 51 Pull this tube out through its hole in the frame The sealing RTV in the hole will sepa rate with sufficient force c On all other models only one grease tube is used connected between the inner bearing cap and the framehead Remove this tube 9 10 11 12 Place three 0 125 in spacers wedge shaped around the armature in the air gap between the armature and the fields to maintain a vertical atti tude of
2. 380 Mineral Gil Viscosity 100 5507 4 iet ek e e a er eed IC 475 525 Free Alkali Percent Max 0 50 Free Acid Percent 2 41 2 Nil Golor eee ats gas Amber Base With Antioxidant Lithium Oxidation Resistance Time To Reach 20 psi Drop At 210 F Hr 1000 COITOSIOI a oed ou rope LO C re Let etu Got cie aA boe Must Pass Approved 0 1 2 12 24 22 Shell Oil Brand ie REX RERUM RU e eis SRM UU Ke ERN RW Rete RR Cyprina RA GEK 91584D Vertical Drilling Motor GE752 SPECIAL TOOLS AND EQUIPMENT CAUTION This machine is of open splash proof construction It is force ventilated and requires an ample supply of cooling air The cooling air should not contain combustible gases If it is applied in an environment which may contain combustible gases an adequate supply of contaminated cooling air must be provided The following items are required to maintain repair and overhaul the motors Part Megohmmeter or Megger 600 vo
3. 50 13 TAP THRU 4 HOLES 8 00 7 VIEW AT B 1 12 75 SHOWING FLANGE FLAT WITH COVER VIEW AT A REMOVED SHOWING FLANGE 375 24 THREAD REMOVED 50 13 TAP THRU m 4 HOLES 50 VIEW SHOWING HYDRAULIC FLAT PUMP OFF FOR HUB VIEW AT C BOTH ENDS SHOWING FLANGE WITH COVER REMOVED FIG 49 OUTLINE 051 AUT 41E903745 CHG A E 37954B 78 Vertical Drilling Motor Type GE752 GEK 91584D 005 11 375 DIA 1 06 5 69 ARMATURE LOCK ARRANGEMENT SEE NOTE 1 2 NPT 2 HOLES FOR PRESSURE TAPS 10 50 B NOTE FOR ARMATURE LOCKING ARRANGEMENT LOCATED ON COMMUTATOR END TO BE IN PLACE DURING MOUNTING OF MOTOR BUT TO BE REMOVED vpn Co aM MOTOR 1 56 DIA THRU 4 HOLES 002 11000 1 005 DIA THRU 2 HOLES 15 1 10 2 HOLES FIG 49 OUTLINE 051 AUT 41E903745 CHG 37954 79 GEK 91584D Vertical Drilling Motor GE752 562 DIA THRU 2 HOLES 1 25 TAPER IN DIA PER FT IN LENGTH BOTH ENDS m JR 005 11 375 3 125 8 NS 2A THREADS BOTH ENDS AIR INLET YY T 0 656 DIA DRILL X 2 12 DEEP 0 750 10 TAP X 1 50 DEEP e 50 13 1 00 DEEP 4 HOLES AS SHOWN VIEW AT D Bes 6 HOLES 390 DIA DRILL THRU DRILL X 1 50 AIR INLET FLANGE 1 25 DIA C BORE 20 DEEP
4. 1 4 15 375 Riser Width minimum permissible 0 625 Dust Groove in Width zs ceo retra memet Latte oe 0 250 Bi PET 0 125 Commutator Cont d Concentricity New Commutator in Total Indicated Runout 0 001 Variation of Indicator Runout within in any Group of 20 Bars De Ren seh Pre Rauch MR vao D 0 0004 Variation of Indicator Reading between in any Two Adjacent Bars s p e eie TEES 0 0001 Concentricity Used Commutator in Resurface if runout exceeds 0 010 TIR or 0 003 within any group of 6 bars After Resurfacing TIR 0 001 Bar To Bar Test 500 v Voltage Varlation Bar lo Bar a uso sse RUE ALIE UHR ede DLE Led p UR LE We upi 5 Armature Balance Commutator Ends ara aA 12 0 42 2 Dive Ended utu ON Me rue 10 0 35 2 Armature Bearings Min Max Diametral Clearance Assembled In Drive End 0 005 0 009 Commnutator Erid ir easa ee wade erie peed wae 0 0005 0 0035 Runout Measured from Shaft to Outer Race in Drive End ws oh eh Pale oad
5. 0 112 GASKET LEEVE MODELS US2 UP6 AUT2 AND AUP5 APPLY NALCO RC TO BORE OF P7 AND SHAFT HEAT P7 TO 1809 3560 P RISE AND ASSEMBLE AS SHOWN 12 REFER TO ASSEMBLY INSTRUCTIONS FOR DETAILS 9 10 FILL BEARING COMPLETELY 7 F WITH 20 8 OZ OF P11 2 USE 5 2 OZ OF P1 USE 5 2 OZ 11 THI THI f if Fo W N 6 SMEAR 0 80 OZ OF P11 ON GREASE SEALS AND SEAL SURFACE FIG 39 COMMUTATOR END BEARING ASSEMBLY 41B538068 CHG 0 39300 63 GEK 91584D Vertical Drilling Motor GE752 1 OUTER BEARING RACE WITH ROLLERS BEARING CAGE FIG 40 CHECKING INTERNAL CLEARANCE OF BEARING A 120403 11 The clearance between the rollers and the inner race should measure between 0 0012 and 0 004 in Try various gauge thicknesses until clearance can be determined by the feel of the gauge as the gauge is slowly pulled from between the roller and the inner race 12 Pack 4 8 oz of grease in the outer circumference of outer bearing cap 5 13 Install a new gasket 54 and bearing cap 5 with bolts and lockwashers 53 14 Smear seals on bearing cap 5 and sleeve 47 with grease 15 Heat sleeve 47 to 110 C 230 F rise and shrink it onto the shaft tight against the roller bearing inner race 48
6. 4 BOSSES 2 HOLES FURNISHED MODELS FURNISHED ON MODELS SHOWN IN TABLE SHOWN IN TABLE 1 562 DIA THRU 2 HOLES 1 25 TAPER IN DIA PER FOOT IN LENGTH a BOTH ENDS 005 m 3 125 8 NS 2A THREADS BOTH ENDS AIR INLET FURNISHED ON MODELS SHOWN IN TABLE 1 390 DIA DRILL THRU 578 DIA DRILL X 1 50 DEEP 50 13 X 1 00 DEEP LES 1 25 DIA C BORE X 20 DEEP 6 HO GREASE VENT TUBE 4375 20 TAP THRU AND 375 DIA DRILL X 2 12 DEEP FITTING D REF 75 10 X 1 50 DEEP SEE TABLE 1 1 25 20 4 HOLES AS SHOWN VIEW ATG LT i 1 50 SECTION ENLARGED TABLE 1 FITTING MODELS MODELS MODELS UP1 AUP1 UP2 AUP2 SEE NOTE A 25 PIPE NOT NOT PLUG FURNISHED FURNISHED B 25 MALE 25 PIPE NOT NPT PLUG FURNISHED C 25 MALE NOT NOT NPT FURNISHED FURNISHED D 25 25 PIPE NOT PLUG PLUG FURNISHED NOTE ALL MODELS EXCEPT UP1 UP2 AUP1 AND AUP2 FIG 48 OUTLINE UP AND AUP 41E903631 CHG H E 28755B 76 Vertical Drilling Motor Type GE752 GEK 91584D MINIMUM REQUIRED TO REMOVE COVER AIR FLANGE 21 00 50 2 HOLES 562 DIA 2 HOLES REF BOTTOM INSPECTION COMMUTATOR END COVER 687 DIA IN 132
7. 915840 VERTICAL DRILLING MOTOR TYPE GE752 CONTENTS CONTENTS CONT D Page Page INTRODUCTION 2 BRUSHHOLDER SLEEVE REPLACEMENT 36 GENERAL DESCRIPTION 2 ARMATURE oats 37 IM aie ma A 4 TABLE 3 STANDARD BOLT TORQUE SPECIAL TOOLS AND EQUIPMENT 8 VALUES Su a eme k ERE 37 GROUNDING INSTRUCTIONS 8 TEST AFTER REPAIR Armature 44 GROUNDING PROCEDURES 9 MOTOR FRAME FIELD COIL OVERHAUL 9 REPLACEMENT 45 LUBRICATION 9 TEST AFTER REPAIR GREASE TUBES AND PIPE PLUGS 9 Coiled Frame Without Armature 55 INSPECTION 4 cicuta Sea 8B eee 10 TABLE 4 VARNISH VISCOSITY CHART 10 FOR DIPPING COILED FRAME 55 13 VARNISH TREATMENT ARMATURE 56 BASIC REPAIRS 13 BALANCING ARMATURE 56 BRUSH REPLACEMENT 13 REASSEMBLY 56 BRUSHHOLDER REPLACEMENT 13 BRUSHHOLDER CLEARANCE BRUSHHOLDER CLEARANCE ADJUSTMENT 65 ADJUSTMENT 14 BRUSH INSTALLATION 65 COMMUTATOR RESURFACING 14 HUB MOUNTING
8. 1 5 4375 20 TAP THRU AND 375 f A 25 NPT 2 HOLES REF 1 25 FOR REGREASING SECTION D D ENLARGED 50 NPT 2 HOLES REF A 1 00 8 UNC 2B THREAD 1 50 DEEP 8 HOLES EQ SP ON 25 00 DIA B C 1812 DIA 1 94 DEEP 2 00 8 HOLES EQ SP ON 25 00 DIA B C 1325 24 ARMORED CABLES EXTENDING BOTEOMIINSPECTSI N 562 DIA 2 HOLES REF 10 FEET FROM COVER COMMUTATOR END FRAME FIG 49 OUTLINE 051 AUT 41E903745 CHG E 37954B 80 Vertical Drilling Motor Type GE752 GEK 91584D 81 GEK 91584D Vertical Drilling Motor GE752 GE Transportation Systems 2901 East Lake Road NEW 5 90 WLF REVISED 10 90 WLF REVISED 8 92 WLF Erie Pennsylvania 16531 REVISED 11 93 WLF PRINTED REVISED 02 05 NBS USA 82
9. 4 ROLLERS 6 Lower the armature slowly into the frame being careful not to damage the commutator When the armature is almost fully inserted use the guide studs to align bearing housing 46 and framehead bolt holes 56 Position the bearing cap to accommodate the grease tubes in UP1 and AUP1 models SUPPORT FOR INDICATOR ON ARMATURE SHAFT INNER BEARING 7 When the armature has reached its limit of travel la remove the guide studs and install bearing cap 4 with a new gasket 57 using bolts and wash ers 52 Draw the bearing housing into framehead 56 Torque bolts to 105 115 ft lbs FIG 37 CHECK ALIGNMENT OF BEARING AFTER ASSEMBLY 120402 61 GEK 91584D Vertical Drilling Motor GE752 FOR P10 AND P12 ETT FOR TYPE OF GREASE SEE DATA SECTION DESCRIPTION FRAMEHEAD NOTE FOR P5 MODELS UP1 AND AUP1 ONLY 1 APPLY NALCO RC BORE OF P5 AND SHAFT DIAMETER 2 HEAT P5 TO 180 RISE AND ASSEMBLE AS pale FILL BEARING COMPLETELY WITH 20 8 07 OF P10 USE 5 25 OZ OF P10 IN THIS CAVITY 11 USE 5 25 07 0F P10 IN THIS CAVITY w psum MODELS SEE TABLE 2 PAGE 20 SMEAR 0 50 02 OF P10 DN GREASE SEALS FIG 38 COMMUTATOR END BEARING ASSEMBLY 41B532745 E 39090A 8 Install framehead bolts 10 and lockwashers ing cap so that they protrude through a hole in 12 Torque to 440 495 Ib ft the frame
10. 66 BASIC OVERHAUL 19 TESTING AFTER OVERHAUL 67 TESTING BEFORE DISASSEMBLY 19 TESTING SERIES MACHINES TABLE 2 DRAWING REFERENCE 20 Models 5GE752AUP AUT 67 DISASSEMBLY 20 TESTING SHUNT MACHINES CLEANING 30 Models 5GE752UP and US 68 INSPECTION AND TEST OF REMOVING ARMATURE DISASSEMBLED MOTOR 31 LOCKING ARRANGEMENT 69 BEARING INSPECTION 31 LOCKING THE ARMATURE FOR SHIPMENT 69 ARMATURE tcc oie ee Resta peels 31 SHIPPING 69 COMMUTATOR 32 HANDEIN G a RE 69 ARMATURE SHAFT INSPECTION 32 CLEANING AND SLUSHING 69 MOTOR FRAME 32 SKIDDING 70 BRUSHHOLDERS 35 PROTEG TION eritis 70 REPAIR 5 0 35 ARMATURES 70 LUBRICATION OF BOLTS 35 PREPARATION OF 70 BOXING THE ARMATURE 71 STORAGE ek Sa ERE 71 Pi EET PLACING INTO STORAGE 71 W Revisions are indicated by margin bars REMOVING FROM STORAGE 72 Copyright 1992 1993 2005 General Electric Company All rights reserved This copyrighted document ma
11. EU EXER AE ks ak MENU ti 52 54 Megohmmeter Test Lift the brushes and perform a megohmmeter test on the armature windings and field coils to determine the condition of the insulation A reading of less than 2 megohms indicates poor insulation dirt accumulation or excessive moisture Bar To Bar Resistance Test Test for open or short circuited armature coils 1 Pass a regulated d c current through the arma ture coils 2 Read the voltage drop between the commutator bars with a millivoltmeter if the reading varies more than 5 from the average value de fective or short circuited coil is indicated 20 ex Fo ross Feat rex 35 Fos ro recs Fos Foss Foi Fo 2 roe es Fo 29 Fez 98 Fo Fa DISASSEMBLY Armature Removal From Frame Models UP AUP Before turning the machine from horizontal to verti cal or vice versa attach the armature locking ar rangement to prevent the armature from moving axially Remove the armature locking arrangement before op erating the machine See Table 2 to determine the correct armature lock ing arrangement drawing Refer to the longitudinal drawing Fig 15 and puller tool drawings Figs 16 and 17 1 Clean the outside of the frame 2 Remove the hubs from the
12. Hold the separate field excitation at 10 to 15 am peres Vary the armature voltage to obtain the required rpm At approximately 338 terminal volts no load the speed will be 900 rpm 1 Run the motor for five minutes at 450 rpm In crease the speed to 900 rpm and run for two hours Bearing temperatures should not exceed 70 C 158 F Run until the bearing tempera ture remains constant for 30 minutes Increase the speed to 1300 rpm and hold it while perform ing Steps 2 3 and 4 Then shut down the motor Do not exceed 1300 rpm 2 Measure vibration when running the motor up to speed Vibration should not exceed 0 004 in If excessive rebalance the armature 3 Check the commutator for roughness Be sure brushes are riding properly 4 Listen for noisy bearings with a listening rod 5 Stop the motor and mount an indicator on the frame Turn the armature by hand and measure commutator runout Runout should not exceed 0 001 in 6 Measure the insulation resistance of the wind ings with a megohmmeter If the resistance mea sures not less than one megohm apply an high potential test to ground for one minute as outlined in the DATA section WARNING Electric shock cause serious or fatal injury To avoid such injury personnel should take and observe proper precautions during the high potential testing REMOVING ARMATURE LOCKING ARRANGEMENT See Fig 43 1 Remove the two shipping bolts 1 from t
13. 6 38 18 VIEW AT Y OF 11 13 BRUSH HOLDER 48 I CONNECTION 5 11 13 16 17 24 48 8 Al 62 9 A2 63 24 SEE NOTE 25 SEE NOTE 2 mad FILL C BORES 58 WITH P25 22 24 PLACES 57 12 14 15 5 h 10 F1 49 06 45 F2 39 75 FILL C BORES 38 41 76 A D 5i WITH P25 24 PLACES VIEW OF PINION END ASSEMBLE FLUSH TO TOP OF INSIDE WALL WITHIN 25 AND TIGHTEN UNTIL PLUG IS 75 4 EXPANDED AND TIGHT IN HOLE ENLARGED VIEW AT A 24 SEE NOTE B 38 41 76 VIEW OF PINION END NOTE FOR P74 ATTACH MARKING BAND P74 TO EACH END OF CABLE PTS 8 9 60 61 62 63 68 69 76 77 78 81 82 83 STAMP WITH APPROPRIATE MARKING AT ASSEMBLY FIG 30 COILED FRAME ASSEMBLY 41D732345 CHG V E 39095A 48 Vertical Drilling Motor Type GE752 GEK 91584D MAG FRAME 12 7 10 45 WALL N 19 eut TERM STAPLE 22 BEFORE ASSEMBLING CABLE TERM 6 CONNECTIONS INSULATE CABLE SUPPORTS AS SHOWN 15 COMM END iin 20 VIEW SHOWING METHOD VIEW SHOWING METHOD i OF ASSEMBLING CABLES OF CONNECTING SHUNT ATTACH BRUSH HOLDER THRU STAPLES CABLES CABLES AGAINST INSIDE PINION END WALL OF MAG FRAME P27 FOR PRESSURE SWITCH VPI COILED FRAME WITH ONE COAT STATIONARY BAKE FOLLOWED ONLY IF NO PRESSURE SWITCH BY ONE SPRAY COAT ON THE COMM CHAMBER ONLY REQUIRED PLUG HOLE WITH P51 MODELS R7A AND R7B INSULATE EXCITING AND COM MUTATING FIELD
14. As the brazing strips melt add more solder to fill the joint and form a level surface Coil Installation Procedure for New Coil Pole Assembly 4 Remove heat absorbent packing from insulation Use dry compressed air and blow out the inside of the frame NOTE Install any exciting coils and braze their connections before installing commutating coils WARNING Personal injury may result if prop 1 Before installing any coil and pole clean the pole contact surface on the frame and the pole piece mounting surface er eye protection is not worn when cleaning with compressed air 5 Torque the pole bolts to the values listed in Table Install the new pole and coil in the frame with any shims that were on the damaged coil Use new 3 Page 37 Standard Bolt Torque Values washers under bolt heads Lubricate the bolt 6 Check the polarity of the field poles heads threads and washers and draw the pole Energize the field circuit with a battery and check bolts moderately tight pole polarity with a compass Fig 33 Refer to Table 2 Page 20 to determine the cor 7 Insulate the connections with silicone putty and rect coiled frame assembly drawings All coil wrap connections with Mylar film 80 Apply connections must be brazed with silver solder glass tape and extend each taping 1 2 in beyond GE B20A6 Use two pieces of solder 0 010 x 1 the bare area of the connection Brush the con in X 1 in between terminal surfaces and
15. INSUL OVER EQUALIZERS INSUL IN EQUALIZER LOOP INSUL OVER EQUALIZER z m LAST TURN DECK oo oo gt m IDENTIFICATION PRINT WINDING INSUL C E INSUL IN LOOP LOWER DECK INSULIN LOOP LAST TURN 38 LOWER DECK RADIUS SPACER C E TOP 59 FILLER FOR COMM LAST TURN AND BOTTOM STRING BAND DECK BINDER OVER COMM 6o BINDING BASE SEAL OVER COMM AND STRING BAND LPO NEUL 7 a 2ND AND 3RD DECK RADIUS SPACER BOTT 7 67 BAND FOR EQUALIZERS CONTINUOUS WIRE DIAGRAM 55 NSULOVEREQUALIZERS SHIM IN RISER SLOT 69 NSUL OVER EQUALIZERS WINDING INSUL C E 17 FILLER 34 FILLER FOR COMM STRING BAND FILLER FOR COMM STRING BAND 37 Babone f 7 BINDING BASE 3 NOTE FOR P38 P E BINDING mE APPLY 37 ACTIVE TURNS OF P38 AT 560 20 LB TENSION AS THE 1ST DECK ADAE DE TURNS OF P38 550 20 LB TENSION APPLY 35 ACTIVE TURNS OF P38 AT 600 201 TENSION AS THE 2ND DECK THE 2ND AND 3RD DECK MUST BE A CONTINUOUS BAND FIG 19 ARMATURE INSULATION 410731545 CHG F 18156 34 0000 DIAM 0 0000 0 0009 DIAM 0 0000 0 000 4 938 0000 DIAM 0 0008 5 5 1203 oi ane 63 63 y 5 9 16 1 64 DIAM DO NOT GRIND 5 6295 SHAFT CENTERS ee s8 1 2 REF 1 8 DRIL
16. Install puller Part 6751547G10 and pull spacer 43 from the commutator end of shaft 22 Install puller Part 675154706 and pull bearing housing 46 with bearing 44 from the shaft 23 Press ball bearing 44 from bearing housing 46 using an arbor press 24 If applied remove the nilos 4 Fig 39 from the bearing and discard 25 If applied remove the seal ring 5 Fig 39 from the sleeve and discard 26 Install puller Part 6751547G11 and pull sleeve 45 from the shaft 27 If it is necessary to remove the commutator end framehead 56 place the frame commutator Vertical Drilling Motor Type GE752 GEK 91584D end up and remove bolts 11 and lockwashers 12 Use bolts in the framehead jackout holes to break the fit and remove the framehead Armature Removal From Frame CAUTION When lifting the armature out of the frame proceed slowly so that no damage will occur to the armature end windings bear ings bearing fits or the commutator Models US1 AUT Before turning the machine from horizontal to verti cal or attach the armature locking ar rangement to prevent the armature from moving axially Remove the armature locking arrangement before op erating the machine See Table 2 to determine the correct armature lock ing arrangement drawing Refer to the longitudinal drawing Fig 18 and puller tool drawings Figs 16 and 17 1 Clean the outside
17. Smear 0 5 oz of grease on the bearing housing and bearing Models UP and AUP cap seals and on the seal ring wear surface on the nilos ring 4 Armature Assembly Into Frame Refer to Fig 15 1 Assemble the brushholders into the frame Move them well back from commutator to avoid inter ference when installing the armature Fasten and insulate the connections and install outgoing cables 7 Heat the bearing and housing assembly in an oven to 100 C 212 F While hot assemble it onto the shaft with the inner race tight against sleeve 13 2 Block and level the frame in a vertical position commutator end down on a heavy duty stand Be sure there is clearance for the commutator end shaft extension when the armature is low ered into the frame CAUTION Be sure that the nilos ring is assembled over sleeve 13 not pinched between the sleeve and the bearing 3 Install three guide studs in the commutator end bearing housing bolt circle to guide the housing into the framehead fit NOTE Do not heat the bearing and housing as sembly above 1007 C 212 F Higher tempera tures may cause the oil to bleed from the grease 4 Pack 5 25 oz of grease in the outer circumfer ence of bearing cap 4 5 Lift the armature with the hoist and lifting bail at the drive end Line up the hoist directly over the center of the cavity in the frame POINTER RESTS OUTER BEARING AGAINST OUTER RACE WITH BEARING
18. TO RUN CW VIEWED FROM COMMUTATOR END CONNECT F1 TO NEGATIVE F2 TO POSITIVE A1 TO POSITIVE A2 TO NEGATIVE FIG 24 CONNECTION DIAGRAM 414330179 CHG A E 37950A 42 COMMUTATOR CAP AN 2 COMMUTATOR COPPER rara an 22 FIG 25 TIGHTENING 4270 WARNING During resurfacing operations eye protection and a respirator should be worn to protect personnel from dust and fly ing particles use slot guides and depth gauges for accurate uniform cuts Make a few practice passes over a scrap commu tator to get the feel of the tool Care must be taken to prevent the power undercutter from jumping out of the slot and across the commutator surface The high speed operation of the blade will quickly gouge the com mutator 1 After a commutator has been resurfaced the mica between the bars should be undercut to a depth of 0 047 in Undercutting should be done with a sharp edged tool with a cutting width of 0 063 in 2 Blow loose material off the commutator with dry compressed air COMMUTATOR CAP I HE P PRESS THIS DIA 70 TONS TO TIGHTEN COMM TORQUE BOLTS TO 145 LB FT FIG 26 COMMUTATOR PRESSING DIAMETER 18140 Vertical Drilling Motor Type GE752 GEK 91584D WARNING When using compressed air for cleaning purposes flying debris and particles may present a hazard to personnel in the im mediate
19. 16 Seal the grease tubes which protrude through the hole in the frame with RTV 108 64 17 At the commutator end smear the seals on bear ing cap 4 and sleeve 42 with grease NOTE Prior to heating sleeve 42 apply NAL CO RC Hail Conditioner to the inside diame ter of the sleeve and to the mating surface on the shaft Apply the NALCO with a Scott 150 white paper towel only and allow it to dry to a thin white film on both surfaces before pro ceeding with Step 18 18 Heat sleeve 42 to 180 C 356 F rise and shrink it onto the shaft tight against the spacer 43 19 Assemble the grease tubes to the bearing 4 UP1 and AUP1 models only Install pipe plugs in tubes and tube fittings as indicated in Fig 15 NOTE Insure that grease tubes are packed full of grease Armature Assembly Into Frame Models US1 AUT Refer to Fig 18 1 Assemble the brushholders into the frame Move them well back from the commutator to avoid in terference when installing the armature Fasten and insulate the connections and install outgoing cables Block and level the frame in a vertical position commutator end down a heavy duty stand Be sure there is clearance for the commutator end shaft extension when the armature is low ered into the frame Install three guide studs in the commutator end bearing housing bolt circle to guide the housing into the framehead fit Pack 5 25 oz of grease in t
20. IN PLACE DURING MOUNTING OF MOTOR WITH GREASE FITTING FOR BUT TO BE REMOVED BEFORE OPERATION OF REGREASING ALL MODELS EXCEPT UP2 AUP1 AND AUP2 58 50 gt ARMATURE LOCK a ee 7 88 ARRANGEMENT EI 1 1 06 1 56 DIA THRU 4 HOLES AIR OUT I Q ARMATURE 50 NPT FOR AIR PRESS MEASUREM 005 11 375 DIA gt 562 DIA 2 HOLES GE 752 AUP SHOWN IN MAIN VIEWS GE 752 UP SHOWN IN FIG 1 APPROXIMATE WEIGHTS GE 752 UP 6750 POUNDS GE 752 AUP 6850 POUNDS AIR FLOW REQUIREMENTS 2300 CFM OF STANDARD AIR MINIMUM 900 HP G PN 6 50 y _ G 12 2 38 346 1 00 R 3 62 B nen FOOT FOR JACKING DIMENSIONS 2800 CFM OF STANDARD AIR MINIMUM 1000 HP IMPORTANT THE ELECTRICAL EQUIPMENT SHOULD BE LOCATED IN A SPACE WHICH 2 PROVIDES SUFFICIENT ACCESSIBILTY FOR BRUSH INSPECTION 2 ALLOWS REMOVAL OF ALL THE BRUSHES AND PIGTAIL FASTENERS 3 ALLOWS MAINTENANCE PERSONNEL TO COMPLY TO THE GE MAINTENANCE INSTRUCTION SPECIAL REQUIREMENTS E HOLE FIG 48 OUTLINE UP AND AUP 41E903631 CHG H E 28755B 75 GEK 91584D Vertical Drilling Motor GE752 SEEN Gen GREASE VENT TUBE GREASE TUBE FITTING C FITTING A FITTING B 50 NPT THRU SEE TABLE 1 SEE TABLE 1 SEE TABLE 1 2 00 DIA
21. Teflon or buckling of the band 3 The surface must be free of damage including scratches and cuts Rewinding Armature The armature must be rewound if any coils are shorted or grounded Riser Width During the rewinding procedure the TIG welds on the commutator risers are machined to break the arma ture coil connections Machining reduces the width of the risers 1 32 to 1 16 in each time which in turn de creases the current carrying capacity of the risers If the calculated width of the risers after machining will be less than the Minimum Permissible Riser Width listed in the DATA section a new commutator must be installed before new armature coils are assembled Vertical Drilling Motor Type GE752 GEK 91584D TABLE 3 STANDARD BOLT TORQUE VALUES For Lubricated Bolts USE THE TORQUE VALUES IN THIS TABLE AS A GUIDE TO IN SURE SATISFACTORY TIGHTENING OF BOLTS AND NUTS TIORSS A SPECIFIC VALUE IS NOT GIVEN IN THE INSTRUC TIONS INCLUDES SOCKET HEAD SCREWS TORQUE VALUES LB FT MEDIUM CARBON ALLOY STEEL SAE GRADE 5 SAE GRADE 8 110 123 130 145 152 169 185 205 185 205 285 315 220 245 340 370 9 300 330 440 490 340 380 510 565 1 8 440 490 685 735 12 530 570 790 8665 1 1 8 7 935 1040 12 750 830 1115 1240 1 1 4 7 1250 1360 12 1040 1160 1600 1750 1160 1290 1745 1940 1420 1580 2125 2360 1570 1740 2300 2600 1 1800 2000 2600 3020 38274 Diameter Refer to the DATA section for
22. as shown in Fig 40 1 Clean and inspect the bearing and the shaft 4 Pack 5 20 oz grease into the outer circumfer bearing fit Remove nicks and burrs ence of the cavity of bearing housing 8 59 GEK 91584D Vertical Drilling Motor GE752 14 ASSEMBLED TO EITHER P13 OR P17 DEPENDING ON MODEL 16 21 13 NOT INCLUDED ON ALL MODELS 12 NOT INCLUDED ON ALL MODELS APPLY 15 THREADS AT BOTH ENDS OF P12 20 USE IF NECESSARY TO NOT INCLUDED ON ADJUST FOR PROPER ALL MODELS ASSEMBLY OF PARTS 24 17 18 AND 19 3 TORQUE TO 110 120 FT LBS 22 FILL BEARING COMPLETELY USE 4 8 OZ OF WITH 29 OZ OF P7 P7 IN EACH CAVITY SMEAR 5 OZ OF P7 ON SEALS MODELS SEE TABLE 2 PAGE 20 3 BEARNGCAP 17 FITTING90ELBOW 4 LOCKWASHER 5 8 N i8 FIG 36 DRIVE END BEARING ASSEMBLY 41B537821 E 37952B 60 Heat bearing housing 2 oven to 100 212 F While hot assemble nilos ring 4 ori ented as shown in Fig 40 and the ball bearing Vertical Drilling Motor Type GE752 GEK 91584D Heat spacer 6 to 110 C 230 F and shrink it onto the shaft tight against the inner race of ball bearing 3 3 into the housing firmly against the shoulder at the bottom of the bearing fit The bearing assembly will be completed when the armature is assembled into the frame 6 Fill all voids in the ball bearing completely with approximately 20 8 oz of grease
23. com nish grade stones for the final grinding If new mutator surface and one stone with a feeler stones will be used they should be contoured gauge or a fiber strip approximately 0 030 in on a Carborundum wheel to approximate the thick Traverse the carriage to the other end of curvature of the commutator the commutator and check the clearance under the same stone The clearance should be the Install the stones in the grinder so the entire surface same at both ends If clearance is not equal at of the commutator will be resurfaced when the carriage both ends adjust the mounting bracket by is traversed from side to side Proceed with alignment means of the set screws to obtain equal clear of the grinder as follows ance at both ends 17 GEK 91584D Vertical Drilling Motor GE752 2 Turn the feed control to back the stones away from the commutator before starting the ma chine NOTE If possible use some method of collect ing the copper chips and abrasive dust pro duced by the grinding operation For example use a vacuum cleaning device with the suction wand set just behind the trailing edge of the stones Grinding 1 18 Apply power to the machine and gradually in crease speed to 900 1000 rpm NOTE Do not grind the commutator to a depth where no mica undercut remains or to a diame ter which is smaller than the minimum permis sible diameter listed in the DATA section Begin grinding by radially feedi
24. fixture Part 41C685430G1 on the commutator and apply 70 tons pressure at the diameter shown on Fig 26 4 Tighten the commutator bolts to 145 Ib ft torque in a crisscross sequence Fig 27 Tighten the bolts twice in this sequence then tighten bolts once around at 145 Ib ft torque NOTE The specified torque values have no sig nificance unless the bolts are lubricated 5 Checkthe dimension between cap face and seg ments at four locations 90 degrees apart to as sure surfaces are still parallel within 0 020 in Torque Wrench Acceptable Method In the absence of a suitable press bolts may be tight ened with a torque wrench adjusted to apply the indi cated torque to each bolt 1 Clean the front face of the cap and the segments Using a depth micrometer measure the distance X in Fig 25 between the face of the cap and the segments at four points 90 degrees apart The face of the cap and the segments should be par allel within 0 020 in If necessary tighten the appropriate bolts to obtain this parallel relationship between the face of the cap and the segments 2 Remove ONE bolt Clean and lubricate the bolt threads under the bolt head Reassemble bolt and torque to 97 Ib ft 3 Repeat Step 2 for remaining bolts following the crisscross tightening sequence shown on Fig 27 4 Repeat the tightening sequence increasing the torque by 1096 each time until a FINAL value of 145 lb ft torq
25. of sufficient strength to protect the it from damage 1 Clean the armature by removing dirt oil or grease from its surface 2 Treat all unpainted exposed finished surfaces as follows a Remove any corrosion b Wipe off the surface with a clean cloth dipped in petroleum spirits GE D5B8 c Wipe off the surface with a clean rag dipped in methanol and wipe dry DO NOT touch the cleaned surfaces with bare hands d Immediately after cleaning slush the cleaned surface with GE D6C6A1 shushing com pound 3 Wrap heavy paper or cardboard around the com mutator for protection 4 Wrap and secure waterproof paper around ar mature punchings This will prevent saddle tim ber moisture from condensing on the core punchings 5 Wrap both ends of the shaft with Grade C Type 1 wax treated cloth and tape it securely into place NOTE Wherever metal parts come in contact with the wood insert a good grade of water proof paper between metal and wood This will prevent rust formation from the condensation of moisture on the metal PREPARATION OF BOX 1 a suitable box from yellow pine lumber us ing timbers of proper size to support the weight of each armature See Fig 45 2 Make 4 saddle blocks of 3 by 6 in timber cut out to fit circumference of armature core Nail two to the bottom of the box in the proper position to 2 X 6 X 20 1 2 8 PIECES 1X6X22 NO HOLE 1 X 6 57 1 2 11 6
26. of the frame using com pressed air a steam jenny or cleaning solvents to remove accumulated dirt Remove the coupling hub from the shaft if not al ready removed Remove the commutator covers Disconnect and remove all brushes and wrap heavy paper around the for protection during handling Install puller tool Part 6751547G4 and pull the sleeve 6 from the commutator end of the shaft Remove bolts 10 which hold the bearing cap and the bearing housing to the commutator end framehead Remove the bearing cap 8 and gasket 11 Turn the machine on end on a stand commuta tor end down and level it so that the armature can be lifted vertically out of the frame without damaging the bearings commutator or brush holders Screw three guide pins into the commutator end bearing housing 3 to help guide the armature out of the frame 27 GEK 91584D Vertical Drilling Motor GE752 42 UE E Y ILU SS JO ps RRS if AWA DA 7 FIG 18 LONGITUDINAL SECTION 410735357 CHG E 37949B 28 Vertical Drilling Motor Type GE752 GEK 91584D REF DESCRIPTION 22 ARMATURE 23 MAGNET FRAME 24 EXCITING POLE BOLT AND BALL BEARING HARDENED WASHER SPACER 25 EXCITING FIELD COIL 27 ASHER 7 28 IT
27. or grinding 2 Use rubber air hose with the nozzle removed and sweep the commutator surface with 70 psi air pressure WARNING Observe all the following safety precautions to avoid injury 1 Hemove all metal fittings from the air hose or if impossible to remove insulate the fitting Be certain an operator is stationed at the power supply control to quickly remove power from the machine should an emer gency arise Wear rubber insulated gloves goggles while air curing Stand on an in sulated platform Avoid contact with the cable terminals WARNING Do not come into close proximity of an energized motor during the cleaning pro cess The armature commutator and brush rig ging have a high electrical charge which could cause serious injury or death Always use a hose tip that is an electrical when cleaning with air Vertical Drilling Motor Type GE752 GEK 91584D 3 Increase the machine speed to approximately 900 rpm and blow air on the commutator until the sparking stops 4 Increase the speed until full speed is reached do not exceed 1000 rpm and continue to blow air on the commutator until all sparking stops Stop the machine 6 Disconnect external power supply to machine Make all necessary mechanical and electrical changes to restore the machine to service 7 Use a clean cloth and wipe off the brushholders creepage band and accessible surfaces in the commutator c
28. ring Has AG type commutator coils and poles with brazed instead of bolted connections Has air vents in the drive end framehead Has a frame specially machined for mounting the customer gearbox at the drive end Has a different drive end grease arrangement Has rubber hardtop brushes instead of regular duplex brushes Same as AUT1 except Has an improved commutator end bearing assembly and an ABS certified armature shaft DATA Max Permissible Speed rpm 1800 Max Permissible Vibration Commutator End 42 0 002 Resistance at 25 C Ohms Min Max Armature Model 7520 5 amat ivo ut dead hor dead eee ree dee eats 0 00912 0 00949 Model 752AUP ctr rens en IRR NUR RUE 0 00912 0 00949 Model 752US 4 5 Sdn Cb S me ete este 0 00749 0 00800 Model 752AUT 1 ira ied ete re ee Yi quic ed e Duces 0 00749 0 00800 Exciting Field With Cables Model 752U P Bie dae eae ca sie eae kaa ene ed PU RR d 1 25 1 33 Model 752UP After 3 88 1 13 1 22 Model S2AURS dez ed Gertler 0 00512 0 00558 Model 752US eee e n ede ev e ORC SS n a 1 13 1 22 Model 752AU eot LN e 0 00486 0 0053
29. shaft if not already re moved 3 Remove the commutator covers Disconnect and remove all brushes and brushholders Wrap 5 0 0 002 23 15 0 000 ALL DIMENSIONS IN INCHES FOR 6 752 7 ROLLWAY BRG FOR GE752 7 S K F AND TORRINGTON FOR GE752 M R C AND NORMA HOFFMAN BRG FIG 13 COMMUTATOR END BEARING PILOT 18150 Vertical Drilling Motor Type GE752 GEK 91584D heavy paper around the commutator for protec tion during handling Remove grease tubes from the end bearing cap a and AUP1 models there are two grease tubes 19 20 b On UP2 and AUP2 models there is one grease tube 19 c On all other models only a pipe plug is pro vided in the bearing cap Install puller Part 675154764 and pull sleeve 42 from the shaft at the commutator end The sleeve has four tapped holes for applying the puller Apply heat to the sleeve with a torch while pulling to facilitate removal Remove bolts and washers 52 and remove bearing cap 4 and gasket 57 from the frame head Make sure the armature locking arrangement is securely installed Turn the machine on end on a stand commutator end down and level it so the armature can be lifted vertically out of the frame without damaging the bearings commutator or brushholders Remove the armature locking ar rangement N
30. spacer 9 to 110 C 230 F and shrink it sembly above 100 C 212 F Higher tempera onto the shaft tight against the inner race of ball tures may cause the oil to bleed from the bearing 3 grease 58 Vertical Drilling Motor Type GE752 GEK 91584D DESCRIPTION FRAMEHEAD GASKET BEARING LOCKWASHER N405P47P BOLT N22P33056 SLEEVE 6 GREASE SEE NOTE FITTING NOTE FOR P7 8 9 TUBE ASSEMBLY FOR TYPE OF GREASE FITTING SEE DATA SECTION NUT FLODAR PT NO 17 8 PIPE FITTING PIPE PLUG N5700P31 LOCTITE 497A8 NOTE FLINGER 06P36 SEE ROLLER BEARING 5 15 18 BEARING FILL BEARING COMPLETE WITH 29 0 02 OF P7 8 USE 4 8 OZ OF P7 IN THIS CAVIT APPLY P15 TO PIPE THREADS 2 PLACES Ly 10 TORQUE BOLTS P5 110 120 FT LB 45 USE 4 807 OF P7 IN THIS CAVITY T3 6 SMEAR 0 50 07 P7 GREASE SEALS MODELS SEE TABLE 2 PAGE 20 FIG 35 DRIVE END BEARING ASSEMBLY 39301 The bearing assembly will be completed when the 2 f sleeve 13 was removed heat it to 110 C armature is assembled into the frame Commutator End Bearing Models US2 UP6 AUT2 and AUP5 Refer to Fig 39 230 F and shrink it tight onto the shaft against the shoulder 3 When sleeve 13 has cooled assemble a new seal ring 5 onto the sleeve oriented
31. the Minimum Permissi ble Commutator Diameter dimension If the commutator brush surface diameter will be less than the minimum permissible diameter after resurfacing operations are performed replace the commutator before the new ar mature coils are assembled 37 GEK 91584D Vertical Drilling Motor GE752 NOTE Before rewinding the armature first check the shaft pinion and bearing fits to deter mine whether or not shaft replacement is re quired See Table 2 to determine the correct shaft drawings The armature can be rewound using a GE Co Sup ply Kit Part 41D730545G8 and the information supplied in the kit NOTE After the armature is rewound the arma ture coil leads must be TIG welded to the com mutator risers the armature must be Vacuum Pressure Impregnated and the commutator must be cleaned and polished Commutator Tightening If the commutator requires tightening commutator assembly pressure can be restored at overhaul by per forming a commutator tightening procedure however it is necessary that spin seasoning and resurfacing oper ations be performed after the commutator is tightened Before proceeding to tighten a loose commutator it must first be determined whether or not the brush sur face diameter of the commutator will be larger than the minimum permissible diameter after the commutator is resurfaced If the brush surface diameter is calculated to be smaller after resurfacing than
32. the armature and to prevent the armature from contacting the fields Remove bolts 10 and lockwashers 12 from the framehead 55 Insert bolts into the jackout holes in the framehead Install a lifting bail Fig 14 onto the end of the shaft Line up the hoist cable with the centerline of the armature before engaging the hook in the lifting bail on the end of the shaft Engage the hook and lift slightly With sufficient strain on the hoist cable to take the weight of the armature off the 25 GEK 91584D Vertical Drilling Motor GE752 00000 675154764 x I SLEEVE PULLER NOTE REFER TO PARTS PART 675154705 LIST ON FIG 16 BEARING INNER RACE PULLER PINION END PINION END 18 22 6 5 00000000 675154767 675154766 SLEEVE AND RETAINING RING PULLER FLINGER PULLER PINION END END 4 17 STD 5 Jj gor ts 2 su 6 19 23 NUT 7 16 14_ 12 Nut se 20 sto DESCRIPTION DESCRIPTION DESCRIPTION 21 22 23 FIG 17 PULLER TOOLS 18155 framehead jack the drive end framehead loose 14 Install puller Part
33. tie IER QU APA 0 004 Gomrmutator End oe Mte acera e s Ace 0 003 GEK 91584D Vertical Drilling Motor GE752 DATA Cont d Pole Bore Diameter measured at center of pole in Motors Min Max Exciting Poles Shunt models 19 606 19 640 Exciting Poles Series 15 19 613 19 640 Commutating Poles Both Shunt and Series models 19 956 19 998 Impedance Test Voltage Drop Coiled Frame Without Armature Min Max Exciting Field With Cables Model 752UP 0 5 Amps 60 2 59 0 66 6 Model 752AUP 24 Amps 60 2 13 1 15 6 Model 75205 0 5 Amps 60 2 59 0 66 6 Model 752AUT 24 Amps 60 2 13 1 15 6 Commutating Field With Cables Model 7520 24 Amps 60 Hz 7 3 8 5 Model 752AUP 24 Amps 60 2 7 2 8 5 Model 75205 24 Amps 60 2 7 3 8 1 Model 752AUT 24 Amps 60 2 7 7 8 5 Lubrication Armature Bearings Grease Capacities 2 Drive Endi C UEM 39 1 COMMULALOMENIG 2 ate e teretes W p e ra be gui dec e REOR C RE EHE PR dotar ER
34. to determine the correct sponding pole when the coil s is installed in the coiled frame assembly drawing for the machine being frame repaired Coil Installation Coil Removal Procedure for New Coil Pole Assembly 1 Remove terminal insulation and disconnect coil leads Use a gas torch or brazing tongs to sepa rate brazed connections When using brazing tongs use low voltage and high a c current to heat coil connections 1 Before installing any coil and pole clean the pole contact surface on the frame and the pole piece mounting surface NOTE Install any exciting coils and braze their connections before installing commutating coils WARNING Safety glasses and leather gloves must be worn at all times during brazing oper 2 Install the new pole and coil in the frame with any shims that were on the damaged coil Use new washers under bolt heads Lubricate the bolt heads threads and washers and draw the pole bolts moderately tight ations to protect personnel from physical harm NOTE a gas torch is used coil insulation must be protected from heat by non flam anre near qosorosnt 3 Refer to Table 2 Page 20 to determine the cor 1 Pack absorbent around the insulation near rect coiled frame assembly drawings All coil the connection and over adjacent coils connections must be brazed with silver solder 2 Make sure all exposed insulation is covered GE B20A6 Use two pieces of solder 0 010 x 1 with a thick
35. 0 150 C 284 302 F in 60 minutes at 2940 rpm and check commu tator smoothness at 2940 rpm 5 Allow the commutator to cool and grind cold See the Commutator Resurfacing section Check commutator runout per the information in the DATA section If the commutator is rough or has high bars repeat the pressing tightening spin seasoning and resurfacing procedures un til the runout is within the limits specified in the DATA section 6 Tack weld the bolts to the commutator cap with bronze welding rod GE B50E37 7 Refer to the Test After Repair Armature sec tion for the test voltage and perform a High Po tential test on the armature windings Commutator Resurfacing Prior to turning or grinding the commutator be cer tain there is sufficient stock so the commutator will not be turned or ground below the minimum permissible di ameter Refer to the DATA section for the minimum permissi ble commutator diameter dimension If the brush surface diameter will be less than the minimum permissible diameter after the resurfacing op erations are performed the commutator must be re placed Grinding 1 Prior to grinding true the shaft centers with re spect to the bearing fits by scraping 2 Place the armature in a lathe equipped with a grinding attachment or in a grinding machine Check the concentricity of the bearing fits The TIR should not exceed 0 001 in 3 Cover the armature windings to prev
36. 22 18 PIECES 2 PIECES WITH HOLES 2 6 24 6 22 LPIECES 18 PIECES FIG 45 BOX FOR SHIPPING ARMATURES E 3782A support the armature on core punchings CAUTION Locate the saddle blocks so they do not project beyond the punchings other wise scuffing of coil insulation could occur 3 Support the commutator end of the shaft by two 1 X 6 in boards nailed to the end of the box Drill a hole in the two boards just large enough for the end of the shaft See Fig 45 The end of the shaft will fit in this hole against the end of the box to prevent movement 4 After the armature has been placed in the box insert a board of proper thickness between the end of the shaft and the end of the box Securely nail it in place This will prevent any lateral move ment of the armature in the box BOXING THE ARMATURE 1 Prepare the armature as specified in the forego ing 2 Place it in the box Support it on two saddle blocks under the punchings and secure it against lateral movement See Fig 46 Vertical Drilling Motor Type GE752 GEK 91584D WRAP HEAVY PAPER AROUND COMMUTATOR WRAP WATERPROOF PAPER AROUND PUNCHINGS ADJUST THICKNESS OF END BOARD TO SUIT LENGTH OF SHAFT FIG 46 ARMATURE PLACED IN SHIPPING BOX 3783 3 Place two saddle blocks over the core punch ings as shown in Fig 46 and nail them to the side boards If the box is the correct size the top of the sad
37. 41D735343 CHG C E 37951C 53 GEK 91584D Vertical Drilling Motor GE752 NOTE If a gas torch is used coil insulation Machine Brazing must be protected from heat by a non flam 1 The recommended brazing current is 10 800 mable heat absorbent amperes at 1 6 volts With silver solder brazing strips inserted between connections clamp the brazing tongs on the connection and braze the joint If necessary add additional solder to fill the joint and form a level surface 1 Pack absorbent around the insulation near the connection and over adjacent coils 2 Make sure all exposed insulation is covered with a thick layer of absorbent then heat and separate the coil connections 2 2 Heatthe coiled frame an oven at 150 C 302 F for four hours to soften the varnish so pole bolts can be removed Braze all exciting coil connections before install ing the commutating coils Gas Torch Brazing 1 Pack the coil insulation with non flammable heat Remove the pole bolts and the coil pole assem absorbent material e g interwoven glass cloth bly from the magnet frame 2 Insert the brazing strips and use a C clamp or vi se grip pliers to clamp the connection surfaces tightly together 3 Mark any shims for reassembly with the corre sponding pole when the coil s is installed in the frame m 3 Useatorch tip with a 0 1 in orifice and adjust the torch to obtain a slightly reduced flame
38. 5 Commutating Field With Cables Model z52U P S rap or e v umts RE OT UDINE ute Noe ade 0 00508 0 00540 Model 752UP After 3 88 0 00439 0 00534 Model 752AUP paene toten tace eroe emn cien eter ara 0 00439 0 00477 Model 752UJS nager eyed ERR ONU ROO ee d RR TENTE EN RATE ea 0 00432 0 00480 iore TEST Bn 0 00432 0 00480 Vertical Drilling Motor Type GE752 GEK 91584D DATA Cont d Carbon Brushes MI MP T900 3 4 x 2 1 4 x 2 Minimum Brush Length length at which brush becomes inoperative in 1 3 32 brush is measured the longest side Spring Pressure on Brush Preset 10 12 Brushholder Clearance to Commutator in 1 16 3 32 Clamp Bolt Torque 225 250 Commutator Side Mica Thickness in 0 060 Slot Depth m oraret RUD eu RW e Sele ee 0 047 Undercutting Saw im 0 063 BIEInI 1 000 Diameter in ee Munt 16 625 Worn minimum
39. 5 24 CABLES EXTENDING 10 FEET FROM 812 DIA X 1 94 DEEP 8 HOLES EQ SPACED ON 25 00 DIA B C 1 00 8 2 THREAD X 1 50 DEEP FRAME 1 12 I 6 x93 8 00 7 11 09 3 25 10 25 AM Y Y 8 00 DE lt 8 00 gt lt 1 12 1 12 8 00 lt 1 12 VIEW SHOWING FLANGE WITH COVER REMOVED VIEW AT F SHOWING FLANGE WITH COVER REMOVED SHOWING FLANGE WITH COVER REMOVED FIG 48 OUTLINE UP AND AUP 41E903631 CHG H E 28755B 8 HOLES SPACED ON 25 00 DIA 0 77 GEK 91584D Vertical Drilling Motor GE752 25 NPT FOR REGREASING 2 25 DIA 3 HOLES FOR LIFTING d AIR OUT MY 4 CORNERS AIR OUT BEN 50 13 1 00 DEEP 8HOLES IMPORTANT THE ELECTRICAL EQUIPMENT SHOULD BE LOCATED IN A SPACE WHICH 1 PROVIDES SUFFICIENT ACCESSIBILITY FOR BRUSH INSPECTION 2 ALLOWS REMOVAL OF ALL THE BRUSHES AND PIGTAIL FASTENERS 3 ALLOWS MAINTENANCE PERSONNEL TO COMPLY TO THE GE MAINTENANCE INSTRUCTION SPECIAL REQUIREMENTS GE752AUT AND US1 SHOWN IN MAIN VIEWS ml 1 72 APPROX WEIGHT GE 752 AUT 7035 LBS AIR FLOW REQUIREMENTS 2300 CFM OF STANDARD AIR MINIMUM 900 HP THIS AREA FOOTFLUSH 2800 OF STANDARD AIR WITH FRAME FACE MINIMUM 1000 HP 50 19 TAP THRU BOTH SIDES 4 HOLES 1 12 9
40. 6751547G4 and pull sleeve and lift the complete armature assembly out of 47 from the shaft at the drive end Heat may be the frame DO NOT DAMAGE THE COMMUTA applied TOR 15 Remove bolts and lockwashers 53 from bear 13 Move the armature to a suitable fixture for further ing cap 5 Remove the bearing cap and gasket bearing disassembly or repair 54 26 16 Remove the framehead It will come with the bearing outer race and bearing rollers 17 Pullthe inner bearing race off the drive end of the shaft with puller Part 675154705 18 Remove flinger 49 and inner bearing cap 51 with puller Part 6751547G6 by inserting the four puller bolts into tapped holes in the inner bearing cap 19 If necessary remove inner sleeve 50 with puller Part 6751547G7 20 Press the outer bearing race and rollers from the framehead with an arbor press NOTE Before pressing the outer bearing race out of the framehead observe and record the number on the face of the race which is opposite the arrow on framehead After re moval mark the date with electric pencil un der this number to indicate that this position has been used Reassemble the bearing with another number opposite the arrow If the bear ing has not been previously marked etch Nos 1 2 3 and 4 spaced 90 degrees apart on the face of race with an electric pencil Locate No 1 opposite the arrow on the framehead and mark it with the date 21
41. 8 725 VARNISH 414239176848 e ME PUTTY 414239176P448 70 CABE BOX c 61 64 25 SEALANT 49748066 SEE NOTE CAME cas cow 72 i REDUCER CABLE ASSEMBLY lt 7728 CONN BOX SEE NOTE MARKING BAND 29 FLEX CONDUIT PLUG Fe o FITTING CONDUIT Cd CABE G3 AND G4 32 LOCKNUT CABLE LUBRICATE BOLTS 33 BRUSHHOLOER CABLE ASSEMBLY SURGE TREE 34 BRUSHHOLDER SUPPORT 80 SEALER PART SUE LEFT 35 MAGNET FRANE ei f tune uc Le sss 15 size 36 POLE EXCITING POLE piat 9 sc 38 BOLT N22P45060 FITTING L32 5432 Sas S65 39 40 BOLT N22P37052 86 NIPPLE 1 50 X 3 00 41 HARDENED WASHER 87 PIE 150 X 450 42 LOCKWASHER N405P49P MAGNET FRAME MODELS 43 CABLE 89 REDUCER 1 00 2 00 BIED pA 44 90 CABLE ASSEMBLY SEE TABLE 2 PAGE 20 45 CABLE SEE NOTE REUCER 46 CONN STRAP 192 PIPE PLUG N5700P103 FIG 30 COILED FRAME ASSEMBLY 410732345 CHG V E 39095A 49 GEK 91584D Vertical Drilling Motor GE752 x 6 A Pane GS LR Ee ee M amp 6 TORQUE TABLE SIZE TORQUE LBS FT 1 25 12 435 483 250 es MODELS SEE TABLE 2 PAGE 20 VIEW SHOWING BRUSH HOLDER ASSEMBLY SIDE VIEW OF COMM CHAMBE
42. A1 x 32 COMMUTATOR END 22 23 FOR FILLETS FILL C BORES WITH P31 6 TVPIQAE S 7 28 12 PLACES 09 MIN TYP 26 SIDE VIEW OF COMMUTATOR CHAMBER SHOWING PIPE PLUG LOCATIONS BOTH SIDES PINION END FIG 32 COILED FRAME ASSEMBLY 41D735343 CHG C E 37951C 52 Vertical Drilling Motor Type GE752 GEK 91584D Roo 5 2 3 4 BOLT PLUG 1 2 5700 51 HARDENED WASHER 1 1 4 PIPE PLUG 3 4 NPT N5700P63 _COMMUTATING POLE A BOLT 114 124 NO 1473 SILMATE 4974806 60 BRUSH HOLDER ASSEMBLY SEALER NO 1473 SILMATE 497A806P60 BRUSH HOLDER SUPPORT PUTTY 4142391762443 Cd BOLT 7 8 9 X 3 1 4 N22P37052 3 PUTTY 41A239176P443 CABLE 35 2NDTAPING41D735343P35 CABLE 3e PAD 0 cease Pp j i58 CABLES X 3 410735343 38 4 EXCITINGPOLE 5 7 10 11 12 13 14 15 16 17 18 PART 10 13 20 4375 14 30 5 NOTE FOR PTS 33 34 AND 35 INSULATE EXCITING AND COMMUTATING FIELD COIL TERMINALS BY FILLING ALL VAVITIES WITH P33 THEN INSULATE ENTIRE TERMINAL ASSEMBLY WITH 2T 1 2L OF P34 AND 2T 1 2L OF P35 V P l COILED FRAME ONE COAT STATIONARY BAKE SPRAY THE COMMUTATOR CHAMBER INNER SURFACES AND THE FRAME EXTERIOR DO NOT SPRAY THE EXCITING AND COMMUTATING COILS MODELS SEE TABLE 2 PAGE 20 FIG 32 COILED FRAME ASSEMBLY
43. AIR Coiled Frame Without Armature 1 Pass 24 0 amperes 60 Hz current through the exciting series field and read the voltage drop Minimum Volts 13 1 Maximum Volts 15 6 2 Pass 24 0 60 Hz current through the commutating CP field and read the voltage drop For Non Magnetic retainers Standard Oil Co of Pa Vertical Drilling Motor Type GE752 GEK 91584D TABLE 4 VARNISH VISCOSITY CHART FOR DIPPING COILED FRAME NOTE When necessary use Solvesso No 100 to thin var nish GE NO 8001 VARNISH NO 3 ZAHN CUP 70 60 50 TIME SECONDS B 6 20 0 10 20 30 40 50 60 DEGREES THIS END COMPASS NEEDLE NORMALLY POINTS TO EARTH S NORTH MAG NETIC POLE COMPASS USED TO CHECK FIELD COIL POLARITY VARIABLE 2 OHM RESISTOR 6 VOLT BATTERY FIELD COILS FIG 33 FIELD POLARITY CHECK 888 55 GEK 91584D Vertical Drilling Motor GE752 Minimum Volts 7 3 Maximum Volts 8 5 For Magnetic retainers Minimum Volts 0 7 Maximum Volts 12 4 High Potential Test Frame With Used Coils Apply a high potential test voltage of 2000 volts 60 Hz for one minute Frame With New Coils Apply a high potential test voltage of 3500 volts 60 Hz for o
44. ATA section If the commutator requires grinding refer to Com mutator Resurfacing in the BASIC REPAIRS section of this manual for instructions Creepage Band Clean the creepage band located on the commuta tor cap with a clean cloth dipped an approved sol vent Inspect the band for possible flashover damage Make sure the creepage band is tight on the commu tator cap Flash Ring Examine the flash ring for possible flashover dam age Wipe the flash ring clean Keep ring free of dirt and varnish KEEP SHUNTS CLEAR OF LEVER ARMS BRUSH SHUNTS FIG 6 CORRECT POSITION OF BRUSH SHUNTS 22568 Insulation Measure the insulation resistance with a meg ohm meter Megger to determine the condition of the insula tion If reading is low make a further inspection to deter mine if insulation failure or excessive moisture is caus ing the low megohmmeter reading Correct the cause of low readings before returning the motor to service Inspect all accessible parts of the field coil insulation for cracking and evidence of overheating Power Cables Inspect the power cables for signs of excessive heat ing poor insulation or mechanical damage Assure all terminals are tight Replace any cables which show low insulation resistance or will not stand 75 above rated voltage Mounting Bolts Check all mounting bolts to assure tightness SEMI ANNUALLY 1 Perform inspection ope
45. COIL TERMINALS BY FILLING ALL CAVITIES AND COVERING ALL BOLT HEADS WITH 24 INSULATE TERMINAL ASSEMBLY WITH E P18 AND 17 AND BRUSH THOROUGHLY WITH P23 SECTION 51 DESCRIPTION REF DESCRIPTION SIDE VIEW OF COMM CHAMBER _ 1 E PIPE PLUG N5700P1031 2 COMMUTATO 48 CONN BAR ML E E CON BAR 40 4 CONN STRAP 50 CONN BAR 34 i 42 5 CONN STRAP 51 PIPE PLUG N5700P63 6 CABLE BRUSHHOLDER 52 MARKING BAND SEE NOTE 7 CABLE MARKING BAND SEE NOTE 8 cable __ PIPt PLUG N5700P51 CARBON SARBO o pese E 711 BOLT 022227020813 57 REDUCER BOLT AND WASHER 58 L CKNUT LOCKWASHER N405P44P 59 FITTING CONDUIT 14 NUT N203P21813 0 cape 15 WASHER 61 CABLE 16 1ST TAPING 50 00 07 17207 414238176748 62 CABLE VIEW SHOWING BRUST NO TDERASSEMBRY 2ND TAPING 50 00 71720 41423917613 63 CABLE NOTE FORP10 AND E15 18 1 3 64 BUSHNG Du EO Lad UN I mium ras az 20 TAPE 21 017 1720 41 239176 21 56 BOLT NOTE FOR P52 AND P53 INSTALL P52 AND P53 ON CONNECTION 21 f BUSHING 87 MAGNET FRAME BOX END OF P10 AND P45 TIE 11 FT 414239176 399 6
46. D N22P39032 1 00 8 X 2 00 11 BOLT FRAMEHEAD N22P39036 1 00 8 X 2 25 12 LOCKWASHER N405P50P 1 00 MEDIUM 18 BOLT COVER N22P29014B13 0 50 13 X 0 88 14 LOCKWASHER N405P45P 0 50 MEDIUM 15 NAMEPLATE 16 ESCUTCHEON PIN N532P1106 NO 12 X 0 38 17 MONOGRAM 18 ESCUTCHEON PIN N532P1108 NO 12 X 0 50 19 TUBING 20 TUBING 21 TUBING SEE NOTE 22 TUBING SEE NOTE 23 PIPE PLUG N5700P31 1 4 24 SPACER 1 4 EXST PIPE 3 4 LG 25 CLAMP 26 BOLT N22P21020B13 0 25 20 X 1 25 27 LOCKWASHER N405P41P 0 25 MEDIUM 28 SEALER RTV 108 29 1ST TAPING 12 00 IT 1 2L 41A239176P112 30 2ND TAPING 24 00 IT 1 2L 41A239176P18 31 COILED FRAME 32 COILED FRAME 33 TUBING SEE NOTE 34 GREASE SEE NOTE 35 CAP 36 ARMATURE AND BEARING ASSEMBLY 37 BEARING ASSEMBLY PE SEE NOTE 38 PLUG 39 COVER TOP INSPECTION 40 COVER BOTTOM INSPECTION 41 COVER HAND HOLE 42 SLEEVE 43 SPACER 44 BALL BEARING 45 SLEEVE 46 BEARING HOUSING 47 SLEEVE 48 ROLLER BEARING 49 FLINGER 50 SLEEVE 51 BEARING HOUSING 52 BOLTS AND WASHERS 53 BOLTS AND WASHERS 54 GASKET 55 FRAMEHEAD 56 FRAMEHEAD 57 GASKET FIG 15 LONGITUDINAL SECTION 41D732922 CHG N E 28621D FIG 1 PART 675154704 SLEEVE PULLER COMM END 22 pg
47. GE752 GEK 91584D ASSEMBLE FLUSH TO TOP OF INSIDE 2 45 M 9 ppm WALL WITHIN 25 amp TIGHEN UNTIL 3 PLUG IS EXPANDED amp TIGHT IN HOLE X QNM 2 3 s i 17 74 34 17 1 VIEW B ENLARGED TYPICAL P44FOR PRESSURE SWITCH USAGE i ON CONNECTION BOX SIDE ONLY IF NO PRESSURE SWITCH IS REQUIRED PLUG HOLE WITH P42 CONN BOX xl i GROUND ARMOR WITH P52 G3 amp G4 ONLY VIEWAT D 42 44 SECTION C C STAPLE MAG FRAME WALL SIDE VIEW OF CHAMBER SHOWING PLUGS ON SIDE SECTION E E OPPOSITE CONNECTION BOX ATTACH BRUSH HOLDER CABLES 34 AGAINST INSIDE WALL FRAME 38 NOTE FOR P61 ATTACH MARKING BAND P61 TO EACH END OF CABLE PTS 11 12 13 45 46 47 48 50 56 57 58 64 65 67 amp STAMP WITH APPROPRIATE MARKINGS AT ASSEMBLY CARBON BRUSH DESCRIPTION E DESCRIPTION 1 MAGNET FRAME BRUSHHDLDER EXC FIELD COIL BRUSHHOLDER SUPPORT EXC FIELD COIL PIPEPLUG VIEW SHOWING BRUSH HOLDER ASSEMBLY 4 j COMMUTATOR FIELD COIL 4 PIPE PLUG 5 CONN STRAP 4 REDUCER 6 STRAP CABLE CONN STRAP 46 CABLE CONN STRAP 47 CONN STRAP CABLE 2 4 45 L 5 L 3 10 CABLE BRUSHHOLDER BUSHING 11 CABLE 50 CABLE 54 e gt r gt NOTE AN ACCEPTABLE ALTERNATE METHOD IS TREAT COILED FRAME WITH ONE VPI STA
48. K 91584D 5 Use a digital ohmmeter to check that the bolted connections are solid low resistance connec tions from the cable conductor to the ground point and to the motor frame The meter reading should be 0 2 ohms or less OVERHAUL Overhaul intervals will depend on the severity of ser vice seen by the machine However General Electric Co recommends that an overhaul be performed every 18 000 hours approximately every two years on all machines subjected to normal operation The motor should be removed disassembled cleaned inspected and reconditioned as necessary in cluding varnish treatment of armature and fields Motor bearings should be repacked with grease See the DATA section for grease type and quantity LUBRICATION Periodic lubrication is required on all GE752 drilling machines designed for vertical operation between scheduled overhaul periods Every six months or 2500 hours whichever comes first apply approximately 2 oz of grease at each end GREASE TUBES AND PIPE PLUGS The following lists grease tube and pipe plug configu rations for all models covered in this publication 1 UP1 AUP1 Four grease tubes with pipe plugs two at each end 2 UP2 and AUP2 Two grease tubes with pipe plugs one at each end 3 UP4 UP5 UP6 AUP3 AUP5 One grease tube with a pipe plug at the drive end one pipe plug only at the commutator end 4 US1 US2 AUT1 AUT2 On
49. L 7 16 1 16 ALL DIMENSIONS IN INCHES 0 18 1 16 SECTION Vertical Drilling Motor Type GE752 GEK 91584D 3 1 8 8 NS 2A FULL THDS FOR 15 16 BOTH ENDS 0 0000 5 1535 100008 0 0000 0 0011 DIAM 0 0000 0365 0011 0 0000 6 0335 20710 DIAM 0 0000 5 9077 0 0029 DIAM BRG FIT 627 6 92 5 6 0045 c RADII 1 16 UNLESS OTHERWISE SHOWN MODELS SEE TABLE 2 FULL FHD ENLARGED VIEW AT FIG 20 ARMATURE SHAFT 334B336 D E 39091A 4 a 500 volt megohmmeter test on the coils A reading of 20 megohms or more is ac ceptable 5 See Figs 21 thru 24 and measure and record commutating and exciting coil resistance Re fer to Table 2 to determine the correct connection diagram for the machine being repaired 6 High potential test the field coils to ground WARNING Electric shock can cause serious injury or death Strict safety precautions must be taken and observed by personnel conduct ing a high potential test Apply a high potential test of 2000 volts 60 Hz for one minute BRUSHHOLDERS 1 Inspect the brushholder for flashover damage cracks and burned or pitted areas 2 Check the brush springs to be sure they move freely and do not bind 3 Insert a new brush in the carbonway and move it up and down in the carbonway to be sure it moves freely REPAIR LUBRICATION OF BO
50. LE 2 F1 F2 Al COMM PINION gt END END LEADS A NOTE THE A2 LEAD MUST BE CONNECTED ON THE GROUND SIDE OF THE CIRCUIT VIEW OF COMM END TO CHANGE MOTOR DIRECTION TO RUN CCW VIEWED FROM COMMUTATOR END CONNECT F1 TO POSITIVE F2 TO NEGATIVE A1 TO POSITIVE A2 TO NEGATIVE TO RUN CW VIEWED FROM COMMUTATOR END CONNECT F1 TO NEGATIVE F2 TO POSITIVE A1 TO POSITIVE A2 TO NEGATIVE COMMUTATING ARMATURE COIL EXCITING FIELD FIELD PART 427040461 PART 885548361 PART EQUALIZER 41063021761 PART 8837013P1 FIG 21 CONNECTION DIAGRAM 493A210 CHG 4 E 39092B 36 ARMATURE Creepage Band Replacement Because of its superior adhesion qualities the Teflon creepage band on the outer end of the commutator should be applied using the hot bond process A copy of this process is included in each Teflon Band Kit Part No 76518 which can be ordered from the following ad dress General Electric Company Insulating Materials Product Section One Campbell Road Schenectady NY 12345 Attn Customer Service NOTE The Teflon band is not included in the kit but can be ordered through normal Renewal Parts channels Inspect the Band 1 There should be no gaps at the joint or between the edge of the Teflon band and the copper bars 2 The band surface must be smooth free of var nish and bonded to the underlay material There must not be any bubbles under the
51. LTS The threads and washer faces of bolts and nuts should be lubricated to obtain maximum clamping force at the nominal or at a recommended torque value when bolts and nuts are installed at reassembly Lubri cate all bolts Use a High Pressure Lubricant such as graphite in oil 1 part graphite to 5 parts machine oil by volume Lu 35 GEK 91584D Vertical Drilling Motor GE752 briplate Part 147X1614 Molykote Part 147 1143 Dag Part 147X1613 or anti seize compound Part 147X1640 to lubricate bolts NOTE Threads and washer contact surfaces must be clean before lubricant is applied Where specific torque values are not listed in these instructions refer to Table 3 for standard bolt torque val ues of lubricated bolts Product of Fisk Bros Refining Co Newark Registered trademark of Dow Corning Corp Acheson Colloids Co Port Huron Mich NO 1 0 186 V EVERY BAR EQUALIZED BRUSHHOLDER SLEEVE REPLACEMENT 1 Remove the damaged Teflon sleeve from the brushholder stud To remove sleeve heat the brushholder in an oven to 150 C 302 F then peel or cut sleeve from the stud 2 Thoroughly clean the surface of the stud and re move any carbon or dirt build up 3 Heat a new Teflon sleeve in a 150 C 302 F oven for 15 minutes 4 Using adequate hand protection immediately assemble the hot sleeve on the stud MODELS SEE TAB
52. NOTE UP1 AND AUP1 MODELS HAVE 2 TUBE ASSEMBLIES UP2 AND AUP2 HAVE ONE B NOTE FOR P34 T ridera TERT Llp 444 a T a j GREASE SEE DATA SECTION HH EN NOTE FOR Pe 22 amp P33 E FILL WITH 18 Oz OF P34 I FILL 222 4 P33 WITH 19 OZ P34 1 4 l 197 Dd A TORQUE TO eE 08 92 440 495 FT LBS poc a s APPLY P29 4 P30 OVER 22 ERA P22 4 P33 IN AREA NEAR FIELDS 21 P22 amp P33 TO FIELD STRAP USING P30 25283 FORM CLEAR ARMATURE COIL 53 5 125 IN DIA 47 PER FT IM LENGTH 125 2 THD MODELS SEE TABLE 2 PAGE 20 FIG 15 LONGITUDINAL SECTION 41D732922 CHG N E 28621D 23 GEK 91584D Vertical Drilling Motor GE752 24 REF DESCRIPTION 1 COILED FRAME 2 COILED FRAME 3 ARMATURE AND BEARING ASSEMBLY 4 OUTER BEARING 5 OUTER BEARING CAP 6 CARBON BRUSH 7 COVER TOP INSPECTION 8 COVER BOTTOM INSPECTION 9 COVER HAND HOLE 10 BOLT FRAMEHEA
53. O CENTER HOLE 7 7 8 31 4 y 8 cS Si 2 1 2 4 D iL 4 ALL DIMENSIONS 3 1 8 X 8 THD gt 1 g X 45 IN INCHES FIG 14 ARMATURE LIFTING BAIL 23932 21 GEK 91584D Vertical Drilling Motor GE752 VIEW OF COMMUTATOR END FOR ALL MODELS EXCEPT UP1 UP2 AUP1 AND AUP2 FILL TUBES 4 FITTINGS WITH LS Oz QF LIE E M r VIEW OF PINION END FOR ALL MODELS EXCEPT UP2 AUP1 THIS GREASE TUBE CONFIGURATION AND AUP2 IS APPLICABLE TO MODELS UP1 UP2 AUP1 AND AUP2 ONLY SEE VIEW ABOVE FOR i ALL OTHER MODELS ARBON BRUSHES TORQUE TO 225 250 FT LBS TORQUE TO 440 495 FT LBS TUBING CLAMP 122 MECH AIR GAP 360 ELEC AIR GAP FIG 15 LONGITUDINAL SECTION 410732922 CHG E 28621D 22 Vertical Drilling Motor Type GE752 GEK 91584D REMOVE 8USHING AND REPLACE WITH PLUG P38 VIEW AT PINIDN END FOR UP3 AND AUP3 ONLY BRING TUBING P2t P22 amp P33 OUT THRU THE UNUSED CABLE BUSHING AND SEAL WITH END UP6 5 0
54. R CAUTION Special precautions should be taken to avoid damage to the armature end windings bearings or bearing fits and the commutato when lifting the armature in the vertical position or turning the armature to a horizontal position 11 Place the armature horizontally in an armature saddle for bearing disassembly 12 At the drive end remove the lubricating tube as sembly 9 33 32 and 28 from the framehead 13 Using puller tool Part 675154764 pull the out er sleeve 37 from the drive end of the shaft The sleeve has tapped holes for applying the puller Heat may be applied 14 Remove bolts 34 and then remove outer bear ing cap 36 and gasket 35 15 Slide framehead 29 off the shaft together with the outer race and rollers of bearing 38 The in ner race will remain on the shaft 16 Pull the inner bearing race off the shaft with puller Part 675154705 17 Remove flinger 39 and inner bearing cap 40 with puller Part 675154766 by inserting the four puller bolts into the tapped holes in inner bearing cap 40 18 Press the outer bearing race and rollers from the framehead with an arbor press 30 NOTE Before pressing the drive end outer bearing race out of the framehead observe and record the number on the face of the race which is opposite the arrow on the framehead After removal mark the date with electric pencil un der this number to indicate that this position has been use
55. R COMM END SHOWING PIPE PLUG LOCATION NOTE FOR PARTS 37 38 39 INSULATE EXCITING AND COMMUTATING FIELD COIL TERMINALS BY FILLING ALL CAVITIES AND COVERING ALL BOLT HEADS WITH P37 THEN INSULATE ENTIRE TERMINAL ASSEMBLY WITH 1 1 2 L OF P38 AND 1 1 2 L OF P39 NOTE FOR P40 ASSEMBLE P40 FLUSH TO TOP OF INSIDE WALL OF MAGNET FRAME WITHIN 2 25 AND TIGHTEN UNTIL PLUG P40 IS EXPANDED AND TIGHT IN HOLE 1 SEE ENLARGED VIEW A V P l COILED FRAME ONE COAT STATIONARY BAKE FOLLOWED BY ONE SPRAY COAT THE COMM CHAMBER FIG 31 COILED FRAME ASSEMBLY 410735440 A E 38056B 50 Vertical Drilling Motor Type GE752 GEK 91584D O9 MIN VIEW SHOWING METHOD OF ASSEMBLING CABLES THRU STAPLES PINION END VIEW SHOWING METHOD OF CONNECTING SHUNT CABLES PINION END PINION END ENLARGED VIEW C 1 MAGNET FRAME BOLT 7 16 14 1 BOLT NON MAGNETIC 1 1 4 12X4 LOCKWASHER 7 16 BRAZING STRIP 1X1 6 114 7 334 1 1 26 BRAZING ROD BUSHNG 28 BOLTWASHER 14 20X12 9 9 4 22 LOCKWASHER 7 8 11 FIG 31 COILED FRAME ASSEMBLY 410735440 A E 38056B 51 GEK 91584D Vertical Drilling Motor GE752 FILL C BORES WITH P31 12 PLACES 22 23 FOR FILLETS 8 PLACES TYPICAL 89 VIEW SHOWING BRUSH 37 38 f 96 38 HOLDER ASSEMBLY COMMUTATOR END 32 18
56. R 31 8 EubriGarit ss oreet Re RePEc ERN HE E eme ee ipte des GE D6A2C10 See Grease Specification at the end of the DATA table Weights approx 6720 Armature Only eed teh oet esten tO 2100 High Potential Test 60 Hz to ground for one minute All Windings volts New or Rewound Armature 2 3500 Reconditioned pupu rumu umacha pete IPAE 2000 Megger Test Minimum Megohmmeter Reading megohms Shunt Models 7A Fen E LUE o aestas aman faf E 1 4 FIEF2 neque e c eiecti eer eti ceu e ran UA MUI E dae 0 3 Series Models ATZA2 I ae iiM Qu OR MS tese aiti bd Aide ARM f dads 1 4 2 aiu beter En DLE 1 4 With Commutating Poles CP out Excitation Field in Vertical Drilling Motor Type GE752 GEK 91584D DATA Cont d Motor Ratings Continuous Max HP Shunt UP VONS MEI EDU ee 750 Armature Amps sues sik iae bru a ELE Se 1050 Field Amps s iex ner Re bes al eee ate xe doen eee ace A e OC e E RAD eri fee d ceci ees 57 RPM co IEEE 1050 HorsepowWel RE PAM PAN aie RM MEE ene eae 1000 Series AUP MONS ci oe hee Set ae ete 750 Attmature Amps 35 Sus pa Dc REV Resa anderson 1050 Fiel
57. STALL P11 NOTE FOR P47 ENCLOSE ONE IDENTIFICATION C SIZE PRINT OF 41D730423 IN EACH CARTON OF SUPPLY INSUL NOTE FOR P32 TAPE OVER RISERS WITH 3 4 WIDE A2L14B GLASS TAPE LEAVING 1 4 IN OF RISERS EXPOSED ON THE CORE END FILL BETWEEN ARMATURE LEADS BEHIND RISERS AND OVER BACK 1 4 IN OF RISER WRAP OVER PUTTY WITH A16B39B MYLAR TAPE AND BAKE AS PART OF THE PREHEAT PERIOD FOR INSTALLING P37 COMM SEGMENTS XN ORPHAN ST SLOT 1 COIL M m MAIN WINDING CONNECTIONS SLOT 16 SLOT 15 SLOT 1 ON COILS COILS NOTE P37 BINDING APPLY THE P37 PERMANET CE BINDING COLD TAPE TO HOT 125 135 C ARMATURE APPLY 77 ACTIVE TURNS OF P37 500 25 LB TENSION FIG 19 ARMATURE INSULATION 41D731545 CHG F E 18156A 33 GEK 91584D Vertical Drilling Motor GE752 DEO 38 SEE NOTE 1 146 1 16 12 18 19 20 75 4 7 8 MAX 2 SATURATE P2 THOROUGHLY NOTE FOR TEMPORARY BINDING WITH P56 APPLY TEMPORARY BINDING 6 TOTAL PASSES WITH 0 102 26 PT26 TO BE APPLIED DIAM B4Y19B AT 800 LB TENSION BAKE IN A 150 C OVEN OVER COILS TO LEVEL FOR 4 HOURS THE SURFACE FIRST TURN 2ND DECK DESCRIPTION DESCRIPTION 1 HEAD INSUL BINDING CLIP HEAD INSUL TIE CLIP ETHOD OF FASTENING DING WIRE P E HOD OF SWAGING MM RISERS NSUL 42 ARMATURE COIL
58. Seal around the grease tubes at CAUTION Alternate tightening of commu their hole in the frame with RTV tator end bearing housing and drive end b On UP2 and AUP2 models one grease tube is required The procedure is the same as in dicated in Step 9a framehead bolts Uneven tightening of bolts could damage bearings or related fitted sur faces c On all other models one grease tube is re NOTE Be sure framehead bolt holes are quired This tube connects the inner bearing aligned with bolt holes in inner bearing cap be cap with the framehead and should have fore assembling bolts 10 and lockwashers been assembled with the drive end bearing 12 assembly 9 Install grease tubes at the drive end NOTE Insure that all grease tubes are packed full of grease a On UP1 and AUP1 models two grease tubes are required Clean all residual sealing RTV 10 Use a feeler gauge and check the radial clear from the grease tube clearance hole in the ance on the drive end bearing between each frame Then reach into the cavity of the ma bearing roller and the inner race at the top of the chine around the drive end inner bearing bearing Fig 40 Place the feeler gauge between cap 51 and install these tubes to the bear the top roller and the inner race 62 Vertical Drilling Motor Type GE752 GEK 91584D SEALRING 16 SPACER 8 BEARINGCAP 9 BOLT 5 8 11 X 2 3 4 N22P33044 i0 OCKWASHER N405P47B
59. TING 29 FRAME HEAD 6 8 o 12 21 13 14 i6 qoe 18 19 20 10 11 12 13 14 15 16 17 18 BRUSH 20 COMMUTATING FIELD COIL 21 COMMUTATING POLE BOLT AND HARDENED WASHER BOLT AND LOCKWASHER FITTING EITTING BOLT AND LOCKWASHER GASKET BEARING CAP OUTER SLEEVE ROLLER BEARING ELINGER BEARING CAP INNER SLEEVE 0 02 JO jw o o loo coo o oi I co o O 0 m n A m TORQUE TABLE 13 330 100 8 1 440 495 MODELS NAD 59 TABLE 2 W TN D HH 9 Ba E Q FIG 18 LONGITUDINAL SECTION 410735357 CHG E 37949B 29 GEK 91584D Vertical Drilling Motor GE752 8 Screw a lifting bail Fig 14 on the drive end of the shaft 9 Remove drive end framehead bolts 30 and in sert three jack screws in the threaded holes pro vided in the framehead 10 Line up the hoist cable with the centerline of the armature before engaging the hook in the lifting bail on the end of the shaft Engage the hook and lift slightly With sufficient strain on the hoist cable to take the weight of the armature off the framehead jack the drive end framehead loose and lift the complete armature assembly out of the frame DO NOT DAMAGE THE COMMUTA TO
60. TIONARY BAKE FOLLOWED BY ONE SPRAY COAT IN COMMUTATOR CHAMBER ONLY CABLE CABLE GROUND CABLE 35 BOLT N22P27020813 1 53 16 LOCKWASHER N405P44p BOLT N22P27024813 55 MAGNET FRAME e 1ST TAPING 50 00 IT 1 2L 41A239176P48 56 CABLE SPRING FLANGE MODELS SEE TABLE 2 PAGE 20 2ND TAPING 50 00 11 20 41A239176P13 57 CABLE 58 CABLE 21 FT 11 1720 41 239176 21 59 CABLE BUSHING 60 CABLE ASSEMBLY VARNISH 41A239176F487 61 MARKING BAND SEE NOTE INSULATION SEALANT 497 806 60 SEE NOTE 63 CABLE ASSEMBLY CONN BOX CABLE EXC POLE CABLE COMM POLE CABLE CABLE NIPPLE 1 50 X 3 00 LUBRICATE BOLTS TOR TORQUE LB FT 1 25 7 900 1000 1 25 12 435 483 875 9 115 125 CONN BAR 89 PIPE 1 50 X 4 50 33 CONNECTOR 3 HARDENED WASHER LOCKWASHER N405P49P MAGNET FRAME BOLT FIG 29 COILED FRAME ASSEMBLY 410732353 CHG E 39094A 47 GEK 91584D Vertical Drilling Motor GE752 8 60 11 13 50 VIEW AT Z OF 18 BRUSH HOLDER CONNECTION 11 13 8 35 VIEW OF COMM END 75 ASSEMBLE FLUSH TO TOP OF INSIDE WALL WITHIN 25 AND TIGHTEN UNTIL PLUG IS EXPANDED AND TIGHT IN HOLE ENLARGED VIEW AT D ENLARGED VIEW AT B 25 SEE NOTE 35 46 VIEW OF COMM END
61. a dial indicator 1 40 True the shaft centers with respect to the bearing fits by scraping Place the armature in a lathe and check the concentricity of the bearing fits The TIR should not exceed 0 001 in The maximum runout is 0 001 in Perform the undercutting raking and polishing operations Vertical Drilling Motor Type GE752 GEK 91584D VIEW AT COMM END TO CHANGE MOTOR DIRECTION THE A2 LEAD MUST BE TO RUN CCW VIEWED FROM COMMUTATOR END CONNECTED TO THE CONNECT F1 TO POSITIVE F2 TO NEGATIVE GROUND SIDE OF CIRCUIT A1 TO POSITIVE A2 TO NEGATIVE MODELS TO RUN CW VIEWED FROM COMMUTATOR END CONNECT F1 TO NEGATIVE SEE TABLE 2 F2 TO POSITIVE A1 TO POSITIVE A2 TO NEGATIVE FIG 23 CONNECTION DIAGRAM 41A330278 CHG 0 E 38055B Undercutting small cracks in the mica into which dirt or moisture may accumulate and cause a breakdown in the insulation be See Fig 28 for a diagram of proper undercut tween the commutator segments A sharp hacksaw blade may be used but caution With practice hand held power undercutters can be must be observed since a dull blade or saw produces used Follow the tool manufacturer s instructions and 41 GEK 91584D Vertical Drilling Motor GE752 EVERY BAR EQUALIZED 9 94 VIEW COMMUTATOR END TO CHANGE MOTOR DIRECTION TO RUN CCW VIEWED FROM COMMUTATOR END CONNECT F1 TO POSITIVE F2 TO NEGATIVE A1 TO POSITIVE A2 TO NEGATIVE
62. al groove commutator provides better commutator and brush cooling better commuta tion ability and increased brush life 3 An additional six exhaust openings in the motor drive end framehead and revised air flow pas sage increases air flow and the motor s ability to transfer generated heat is a registered trademark of duPont de Nemours amp Co Vertical Drilling Motor Type GE752 GEK 91584D TABLE 1 MODEL DIFFERENCES Model Differences Superseded By 752UP1 This is a shunt motor with the following distinctions Has internal greasing tubes for both drive end pinion end and commutator end bearings Has a double ended shaft 752UP2 Same as UP1 except Has armored cable Has no grease tubes at commutator end Model Differences Superseded By 752UP3 Same as UP2 except Has a single grease tube at drive end which is part of the framehead bearing assembly for ease of armature disassembly 752UP3A Same as UP3 except Has class H Kapton wrapped exciting coils 752UP4 Same as UP3A except Has an ABS certified shaft 752UP5 Same as UP3A except Has a thermal sensor embedded in each of its exciting and commutating coils 752UP6 Same as UP3A except Has an improved commutator end bearing assembly and an ABS certified armature shaft 752051 This is shunt motor with the following distinctions Same as UP3 except Has an AG type armature with an AF commutator
63. and a standard AUP flash ring Has AG type commutating coils and poles with brazed instead of bolted connections Has air vents in the drive end framehead Has a frame specially machined for mounting the customer gearbox at the drive end Has a different drive end grease arrangement Has rubber hardtop brushes instead of regular duplex brushes 752US2 Same as US1 except Has an improved commutator end bearing assembly and an ABS certified armature shaft 752AUP1 This is a series motor with the following distinctions Has internal greasing tubes for both drive end and commutator end bearings Has a double ended shaft 752AUP2 Same as AUP1 except Has armored cable Has no grease tubes at commutator end Mounting feet have dowel holes for vertical mounting GEK 91584D Vertical Drilling Motor GE752 TABLE 1 Cont d MODEL DIFFERENCES Model Differences Superseded By 752AUP3 Same as AUP2 except Has a single grease tube at drive end which is part of framehead bearing assembly for ease of armature disassembly 752AUP4 Same as AUP3 except Has improved insulation for higher temperatures 752AUP5 Same as AUP4 except Has an improved commutator end bearing assembly and an ABS certified armature shaft 752AUT1 This is a series motor with the following distinctions Same as 752AUP3 except Has an AG type armature with an AF commutator and a standard AUP flash
64. area Personnel should be provided with and trained in the use of personal pro trective equipment as specified by applicable federal or state safety regulations Raking Resurfacing usually leaves particles and slivers of copper hanging on the bar edges or lodged in the under cut slots These must be removed before the motor is placed in service or the particles may bridge the side mica and cause a flashover 1 Brush out dirt and copper whiskers attached to the trailing edge of the bars with a stiff bristle brush preferably one with nylon bristles A new paint brush or stencil brush with the bristles cut short for added stiffness may also be satisfacto ry If stoning and undercutting have produced considerable dragging of copper from the edges of the bars use a raking tool to remove the cop per fins and ragged edges Use the tool to rake the bar edges with the point inserted in the slot so that sides of the V rake the trailing edge of the bar If the tool is ground with flat sides and used with moderate pressure as a raking tool it will re move ragged copper fins and break the sharp FIG 27 COMMUTATOR BOLT TIGHTENING SEQUENCE E 4502 43 GEK 91584D Vertical Drilling Motor GE752 edges of the bars See Fig 12 for an illustration Used Armature of the tool Another method of removing copper fins is to rake the slots with a piece of fiberboard approximately 0 045 in thick Apply a high potential t
65. arnish is removed Clean the shaft with Xylene GE Spec No D5B9 4 Bake at 140 C in an oven for at least eight hours BALANCING ARMATURE Refer to the appropriate longitudinal section see Table 2 Page 20 to determine the correct drawing for balance weight locations Dynamically balance the ar mature within 10 grams 0 35 oz on the drive end and 12 grams 0 42 oz on the commutator end by adding weights on the commutator cap and the armature head REASSEMBLY Brushholders 1 Using bolt and washer attach the brushholder clamp to the frame mount Position the studs of the brushholder in the clamp and move the brushholder radially outward as far as possible 2 Tighten the brushholder clamp bolt but do not torque Install all brushholders 3 Connect the brushholder cables Refer to Table 2 Page 20 to determine the correct connection diagram Armature Bearings NOTE Parts that will be shrink fitted should be heated in an oven and assembled hot Make sure shrink fitted parts are tight against adja cent parts after they have cooled Drive End Bearing Figs 34 35 36 and 37 Place the armature in a saddle If the inner sleeve was removed heat it to 110 C 230 F and shrink it tight on the shaft against the shoulder Spread 0 5 oz of grease onto the seals on the inner and outer bearing caps and the inner sleeve Pack 4 8 oz of grease in the outer circumference of the inner bearing cap as
66. braze nections with air drying alkyd varnish 8001 terminals as follows 8 Install and connect cables previously moved Brazing Coil Terminals NOTE Do not the coiled frame before Braze the coil terminals by one of the following meth the cables are installed and the connections are ods insulated 54 Flood Dipping Coiled Frame After field coils have been repaired or replaced and electrical tests completed insulate the coiled frame by flood dipping in GE 8001 varnish See Table 4 Page 55 for varnish viscosity limits Varnish may be thinned as necessary with Solves so No 100 thinner Agitate varnish for 15 minutes be fore dipping frame 1 sure all coil connections are made and insu lated and all cables and ties for cables and con nection straps are in place Tie cable ends above the varnish level 2 Coat all machine fit surfaces with GE 271 black varnish or stripping compound and plug bolt holes with dummy bolts 3 Heatthe coiled frame to 40 80 C 104 176 F and dip the frame drive end down with all coil connections covered for at least 15 seconds Drain and remove the frame from the varnish low the frame to drain for at least 5 minutes in a vertical position drive end down 4 Bakethe frame in a pre heated oven at 150 C 802 F for 30 minutes minimum 5 Clean the varnish from machined surfaces and unplug the tapped holes TEST AFTER REP
67. commu gi NNEN ease Wie NeW supply tator curvature Fig 10 It should also be of suffi eoe cient width to bridge any flat spots otherwise b Increase the armature supply 0 150 v to the stone will ride in and out of the flat and will not 150 volts correct it c Slowly decrease the field supply to bring the 2 Remove one brushholder for access to the com speed up to 1000 rpm mutator WOOD BLOCK SHAPED TO WOOD SCREW COMMUTATOR AND WASHER 0 50 VDC 0 150 VDC 40 AMP 100 AMP REGULATED REGULATED ARMATURE POWER POWER SUPPLY SUPPLY FINE SANDPAPER FIG 8 CONNECTIONS TO RUN A SHUNT MACHINE FROM A D C POWER SOURCE FIG 9 METHOD OF SANDING COMMUTATOR 15 GEK 91584D Vertical Drilling Motor GE752 CAUTION Never use an emery cloth on this or any commutator The abrasive particles on emery cloth scratch the commutator surface and lodge in the groves between commutator segments The condition creates the possibil ity of an eventual flashover which could seri ously damage the machine WARNING Do not come into close proximity of an energized motor during the cleaning pro cess The armature commutator and brush rig ging have a high electrical charge which could cause serious injury or death Always use a hose tip that is an electrical non conductor when cleaning with air WARNING When using compressed air for cleaning purposes flying debris and particles may present a hazard t
68. d Reassemble the bearing with another number opposite the arrow If the bear ing has not been previously marked etch Nos 1 2 3 and 4 spaced 90 degrees apart on the face of race with an electric pencil Locate No 1 opposite the arrow on the framehead and mark it with the date 19 Install puller tool Part 6751547G10 and pull spacer 5 from the commutator end of the shaft 20 Install puller tool 6751547G6 and pull bearing 4 and bearing housing 3 from the commutator end of the shaft 21 Press the bearing from the framehead with an arbor press 22 If applied remove the nilos 4 Fig 39 from the bearing and discard 23 If applied remove the seal ring 5 Fig 39 from the sleeve and discard 24 Install puller tool Part 6751547G11 and pull sleeve 2 from the commutator end of the shaft 25 If necessary to remove the commutator framehead 14 turn the frame commutator end up and remove bolts and lockwashers 13 Use bolts in the framehead jack out holes to break the fit and remove CLEANING The two recommended methods for cleaning are steam cleaning and vapor degreasing CAUTION Do not use caustic soda solution on the armature or coiled frame Steam Cleaning Recommended for both insulated and metal parts 1 Use steam in combination with a commercial non caustic cleaner 2 Suspend the in a position accessible from all directions to a direct flow of steam from the
69. d Amps o eiu ribi eie LE RESI Dip 10096 c E Tb M C M 975 FIOFSCPOWEF ane nhac ae ERU REUS 1000 With 2800 5 air flow Motor Ratings Continuous Continuous Intermittent Max HP Max Torque Duty Cycle Shunt US uei eere ee dE rane Ere erar 750 650 750 Armature Amps 1185 1250 1435 Field AMPS ease eese etm eme et en 60 60 60 Bue cet e De eee Db 1040 900 1065 Totque i esL RUE ater ide uQ REFER ERAS 5705 5995 6745 Horsepower 1130 1030 1365 Series AUT cuo hbri de dont etm o betae dae idee 750 570 750 Armature Amps 1150 1250 1400 Field Strength 10096 10096 100 RPM 965 700 920 TOGUE HU CM 5900 6620 7530 Horsepower 1085 880 1320 NOTE With 2800 SCFM air flow and ABS temperature rise standards 155 C over 40 C ambient Grease Specification D6A2C10 grease is a lithium soap base grease with added antioxidant It contains an oil of heavy viscosity and is especially suitable for high speed high temperature open or shielded bearings in drilling motors Specifications Worked Consistency 77 10 220 240 Dropping Point Degrees F Min
70. d be in contact with the ta pered fit on the shaft Before mounting a hub check and correct the fit as follows 66 Lightly cover the bore of the hub with a blueing compound such as Prussian Blue Snap the cold hub forcefully onto the shaft Mark the relative angular position of hub with re spect to the shaft Remove the hub from the shaft A convenient method of removal is by the use of two finely ta pered steel wedges hardened and ground which are carefully driven between the hub and the bearing outer sleeve on the shaft Inspect the taper fit of the shaft blueing of the hub bore should now show on the shaft If at least 75 percent of shaft surface shows traces of blue ing the fit is satisfactory If however only a few spots of blueing show on the shaft the fit is not satisfactory Dress down the blue spots on the shaft very light ly with a fine emery cloth such as No 400A Trie mite Blue the hub bore again see Step 1 and repeat Steps 2 4 5 and 6 Be sure to place the hub onto the shaft in the same position as marked Generally the fit will be improved but the forego ing procedure may have to be repeated several times to obtain a 75 percent fit Under no circumstances use a lapping com pound since lapping will produce a shoulder at the large end of the tapered fit A shoulder will prevent a perfect fit when the hub is mounted hot i e when it is mounted in the advanced posi tion After a good
71. ddle to protect the commutator and to coil the ends Keep the commutator covered with heavy paper Armature Test 1 With the armature at room temperature 25 C 77 F use a 500 or 1000 vdc megohmmeter and make a dielectric test of the armature insula 31 GEK 91584D Vertical Drilling Motor GE752 tion A reading of one megohm or higher should be obtained If necessary perform additional cleaning and baking operations to obtain this val ue before proceeding NOTE If additional cleaning and baking opera tions do not increase the resistance value of the insulation it may be necessary to replace the creepage band and rewind the armature 2 Measure and record armature resistance See the DATA section for values 3 If there are no armature coils grounded perform bar to bar comparison test to check for open or short circuited armature coils a Pass a regulated current through the ar mature coils b Read the voltage drop between the commu tator segments with a millivoltmeter If the reading varies more than plus or minus 5 a defective or short circuited coil is indicated If the armature fails the bar to bar test the ar mature must be rewound If the armature will not be rewound proceed to inspect the following items Insulation Inspect the insulation of armature coils for cracks physical damage burns and deterioration If minor re pairs are required refer to Fig 19 for insula
72. dles will be flush with the top of the side boards See Fig 47 4 Nail the top cover in place Also nail through to the top saddle blocks to prevent them from mov ing STORAGE PLACING INTO STORAGE When placing GE drilling motors into storage the fol lowing preparations should be performed to prevent damage to the equipment as a result of the storage 1 Machines should be placed on a pallet and stored indoors if possible A clean dry ambient of 604 F is preferred In a high humidity environ ment an ambient of 70 4 F is recommended Ev ery attempt should be made to avoid widely vary ing temperatures and high humidity 2 fitis necessary to store outdoors a protective cover should be used to prevent entrance of rain dust etc 3 All exposed machined steel parts and surfaces should be slushed These areas are slushed prior to shipment from the factory but should be 71 GEK 91584D Vertical Drilling Motor Type GE752 examined for rust Any rust found should be re moved using fine abrasive paper after the old slushing compound has been removed with min eral spirits GE D5B8 Methanol should be used to remove all residue WARNING Cleaning solvents may be toxic and or inflammable They can cause serious or fatal injury if used without proper precautions For safely 72 1 2 3 4 Do not inhale solvent fumes Use solvents only in adequately ventilated areas Avoid con
73. e motors See Table page 3 for the models covered These motors have a ball bearing and a reinforced framehead at the commutator end to support the arma ture shaft vertically They also have a shaft extension at the commutator end for installation of a brake Mounting feet are precision machined to align with the rotational ovals of the motor Refer to 64271 for coverage of GE752 mod els designed for horizontal operation GENERAL DESCRIPTION GE752 motors are used by the oil and gas industry to power offshore and land based drill rigs Designed for vertical operation they are d c machines which require a nominal 750 volt d c power source With suitable switching they will operate equally well in either rotational direction The following provides a listing of basic features The GE752UP and US models are of the Shunt class of motors which means they are separately ex cited with shunt wound fields The GE752AUP and AUT models are of the Series class of motors which means they are self excited with series wound fields GE752UP and AUP motors are original design mo tors introduced in 1983 GE752US and AUT motors are Hi Torque motors with 1 Anew shallow slot design and split conductor ar rangement reduce heat generating eddy cur rents Kapton insulation and new slot design allow more copper cross section and allow the field windings and armature to operate at in creased power levels 2 The spir
74. e pipe plug only at each end Pipe plugs are provided on bearing caps and on the ends of all grease tubes to prevent the ingress of dirt or other contamination Remove the pipe plugs and install grease fittings to facilitate lubrication Replace the pipe plugs after adding lubricant See the DATA section for recommended grease type GEK 91584D Vertical Drilling Motor GE752 INSPECTION MONTHLY Inspect the exterior of the machine including cables for damage Covers Seals Latches Clean the outside of the machine and remove the in spection covers Use clean dry compressed air and blow the dirt and carbon dust from the interior of the ma chine WARNING When using compressed air for clean ing purposes flying debris and particles may present a hazard to personnel in the immediate area Personnel should be provided with and trained in the use of personal protective equip ment as specified by applicable federal or state safety regulations Check exterior covers to be sure felt seals are intact If seals are missing or covers are damaged replace seals or covers as necessary Make sure covers fit prop erly and cover latches work properly Brushholders Fig 5 Satisfactory operation of the drilling motor requires the brushholders to be in good condition Of particular importance is the inside dimension of the carbonways Operation may also be impaired by brushholders which have been mechanically damag
75. ec tion Refer to SPECIAL TOOLS AND EQUIPMENT sec tion for commutator grinder part number See Fig 11 for grinder nomenclature Grinder Installation NOTE Inspect the grinder before installing it to be sure it is reasonably clean Make sure the tra verse slides are free of accumulated dirt and copper chips otherwise the carriage may bind during the grinding operation 1 Remove the inspection covers from the ma chine 2 Remove the most accessible brushholder and clamp the grinder mounting bracket to the frame 3 Remove the brushes from one brushholder adja cent to grinder in a CCW direction 4 Install old brushes in remaining brushholders 5 Bolt the grinder to the mounting bracket Vertical Drilling Motor Type GE752 GEK 91584D ES mA BRUSH SURFACE COMMUTATOR gt lt gt gt RESURFACING 5 0 COMMUTATOR GRINDER MOUNTING BRACKET 5 HEX BOLT 6 LOCKWASHER RESURFACING STONE DESCRIPTION 7 COMM END VIEW FIG 11 COMMUTATOR GRINDER E 18249 NOTE For most applications finish grade Install the resurfacing stones in the grinder and pro resurfacing stones are recommended Medium ceed as follows grade stones can be used for rough grinding a deeply grooved or threaded commutator or a 1 Traverse the carriage to one end of the commu commutator with deep flat spots followed by fi tator and check the clearance between the
76. ed or sustained dam age as the result of motor flashovers Inspect the brushholders for damage If they require replacement refer to BASIC REPAIRS Brushholder Replacement section for instructions When new brushholder carbonways should mea sure 0 753 0 002 in x 2 2575 0 0025 If or when the 0 753 in dimension exceeds 0 765 in the brushhol der should be scrapped If it falls between 0 758 and 0 765 in the carbonway can be restored to its proper dimension according to the following instructions 1 Remove the brushholder Position it as shown in Fig 3 and tap the metal ridge with a hammer 10 FIG 3 RESIZING BRUSHHOLDER CARBONWAYS E 11281 Start at one end and work along the ridge to the other end 2 Check progress frequently by means of a Go No Go gage made to the dimensions shown in Fig 4 NOTE TOOL SHOULD BE HARDENED AND GROUND ALL DIMENSIONS IN INCHES FIG 4 BRUSHHOLDER CARBONWAY GAGE 11283 3 Continue tapping described Step 1 until the 0 753 dimension falls between 0 751 and 0 755 4 due to excessive pounding the inside dimen sion becomes less than 0 751 in file back to size with a fine mill file Additional repairs can be made to restore damaged brushholder bodies Brushholder damage is fairly typi cal when flashovers have occured resulting in some burning or melting of metal at the corners of the brush holder Metal thus removed can be
77. eld with in the limits indicated Check the actual advance with an indicator gauge located in the same rela tive position as used to measure the cold position in Step 3 Fig 41 If the advance is not within specified limits re move the hub and repeat the assembly proce dure TESTING AFTER OVERHAUL TESTING SERIES MACHINES Models 5GE752AUP AUT After the motor has been reconditioned and reas sembled make the following tests to assure it will oper ate satisfactorily Connect the motor to a d c arc welding generator Fig 7 Refer to connection diagrams Figs 22 and 24 for connections Run the machine series connected without load at 900 rpm and measure bearing tempera tures 1 Use Duxseal putty to hold the thermometers on the drive end and commutator end outer bear x UTER PLACE PYROMETER POINTS IN BORE OF HUB FIG 42 MEASURING TEMPERATURE OF COUPLING HUB WITH PYROMETER 5976 67 GEK 91584D Vertical Drilling Motor GE752 ing caps Thermometers should contact the bearing caps for best results 2 Seatthe brushes and run for ten minutes at 900 rpm Frame temperature should not exceed 25 C rise 3 With machine running up to speed measure vi bration Vibration should not exceed 0 002 on commutator end If vibration exceeds this amount rebalance the armature 4 Check the commutator for roughness and make sure the brushes are riding properly 5 Use listening
78. ent entry of grinding dust and chips 39 GEK 91584D Vertical Drilling Motor GE752 COMMUTATING ARMATURE COIL EXCITING FIELD FIELD PART 41053282561 TOP AND BOT PART EQUALIZER PART 41073039461 41663058161 PART 8837013P1 SIDES PART 41073039402 MODELS SEE TABLE 2 NO 1 x v A 7 7 f EVERY BAR EQUALIZED LEAD LOCATION TO CHANGE MOTOR DIRECTION TO RUN CCW VIEWED FROM COMMUTATOR END CONNECT F1 TO POSITIVE F2 TO NEGATIVE A1 TO POSITIVE A2 TO NEGATIVE TO RUN CW VIEWED FROM COMMUTATOR END CONNECT F1 TO NEGATIVE F2 TO POSITIVE A1 TO POSITIVE A2 TO NEGATIVE COMM END FIG 22 CONNECTION DIAGRAM 414237276 CHG 0 E 39093A 4 Grind the commutator and check commutator 2 Cover the windings to keep out chips runout with a dial indicator The maximum com mutator runout is 0 001 in 3 Set the cutting tool for turning copper and set lathe speed to give a commutator surface speed of 300 feet per minute Refer to the DATA section for dust groove dimensions 5 Perform the undercutting raking and polishing operations Turning 4 Make clean smooth cuts to remove just enough copper to renew the commutator surface Do not If the surface of the commutator is badly worn allow the cutting tool to chatter burned or scarred turn the commutator in a lathe as fol lows 5 After turning operations have been completed check commutator runout with
79. ertical Drilling Motor Type GE752 GEK 91584D hub is nearly in engagement with the taper fit not in actual contact snap it forcibly into place with a quick push It is important that the hot hub be in Heat the hub in an oven until it has reached a uni form temperature the desired number of de grees above shaft temperature For example if shaft temperature is 25 C 77 F heat hub to 25 C 77 F 4171 C 339 F 196 C 385 F This procedure should provide an advance of approximately 0 085 in An accurate method must be provided for mea suring hub and shaft temperatures quickly be fore mounting the hub This can best be done with a hand pyrometer In using the pyrometer place points of the gauge inside the bore of the hub Fig 42 NOTE The part must be left in the oven long enough for the heat to penetrate throughout the part Measure the temperature of the shaft and the hub with the same instrument Insure that the hub bore and the shaft taper are clean Then using adequate hand protection quickly mount the hot hub on the shaft in the same angular position as when cold When the FIG 41 METHOD OF USING ADVANCE GAUGE 5975 stantly snapped into position before it has cooled otherwise it will freeze to the shaft and cannot be adjusted further 6 Check the hot or shrunk on position of the hub on the shaft The advance from cold to hot posi tion along the axis of the shaft must be h
80. est voltage of 2000 volts 60 Hz for one minute 2 After slots have been raked with fiberboard or a Rewound Armature raking tool sand the commutator with fine sand paper to remove small pieces of copper sticking from edges of slots Apply a high potential test voltage of 3500 volts 60 Hz for one minute NOTE Measure leakage current to ground dur ing test 3 85 0 milliamps 3 Thoroughly clean the armature core and com mutator with dry compressed air to remove cop per and dust WARNING Electric shock can cause serious or fatal injury To avoid such injury personnel 1 commutator is discolored or smudged pol ishing with canvas crocus cloth fine 4 0 sand paper or 400A Triemite paper is usually suffi cient should take and observe proper precautions during the high potential testing Abrasive paper should be mounted on a wooden Resistance Measurement block curved to fit the surface of the commutator Refer to the DATA section for armature the resis value measure armature resistance 2 Blow loose material off the commutator with dry tance value compressed air 3 Check commutator concentricity with a dial indi cator Refer to the DATA section for runout limits 4 Cover the commutator with heavy paper or felt to protect it from damage NOTE Insulation Processing Armature VPI After the armature has been cleaned and re paired or rewound it must be vacuum pressu
81. fit has been obtained thoroughly clean the shaft and the hub bore to remove all blueing oil or grease Then mount the hub Hub Mounting 1 Thoroughly clean the hub fit on the shaft and bore of the hub see the procedure in the Clean ing section Remove any scoring on the shaft or hub bore Spot the cold hub on the shaft by hand and check for at least 75 percent fit See the Hub Fitting section If necessary dress the shaft to obtain this fit Trial mount the cold hub onto the shaft Measure and record the position of the hub with respect to the end of the shaft Take measurements with a micrometer advance gauge similar to that shown in Fig 41 Zero the gauge Mark points of measurement and mark across the end of shaft and hub face so that the hub when heated can be mounted in exactly the same angular position and so the advance mea surement can be made from the same point Mount the hub hot onto the shaft so as to secure an advance from the cold position to the hot posi tion along the axis of the shaft as indicated in this section The ESTIMATED difference between shaft temperature and hub temperature temper ature rise which will provide this advance is also given The temperature difference is only an esti mate and should be adjusted if necessary to provide the advance within prescribed limits CAUTION Zero settings of advance gauge must not be disturbed until all readings on the hub are completed V
82. gered when placed into storage and periodically while in storage 3 intervals Keep a record of these megger readings as a rapid decrease in insula tion resistance indicates the machine condition is deteriorating and the storage conditions inade quate Before placing a stored motor back into service refer to the applicable instruction Removing Motors From Storage REMOVING FROM STORAGE Before placing a stored motor in service perform the following 1 Blow dust and dirt accumulation out of the wind ings with clean dry air Visually inspect for spring corrosion sticking brushes in brushholders and general defects Vertical Drilling Motor Type GE752 GEK 91584D Check winding insulation continuity to ground a Remove the armature from the frame and re with a 500 volt megger If the megger reading is move bearings from the armature shaft less than 2 megohms the winding should be baked or dried until the moisture content is suffi ciently reduced to raise the megger reading to 2 megohms b Heat the frame and armature until dried suffi ciently to obtain the 2 megohm reading c Pack bearings with new grease Refer to the DATA table for the proper grease Refer to the An electrical source of heat is best for drying as it appropriate bearing illustration for the proper can be easily regulated and is clean Proceed as amount of grease follows d Reassemble the motor NOTE Before drying windings c
83. hamber 8 Brushholder Clearance Install the brushholder previously removed and check and adjust as re quired the brushholder to commutator clear ance on all brushholders See previous Brush holder Replacement and Brushholder Clearance Adjustment sections for instructions to install the brushholder and to adjust brushholder clear ance 9 Installing Brushes Refer to BASIC REPAIRS Brush Replacement section install serviceable or new brushes per instructions listed 10 Vacuum interior of commutator chamber BASIC OVERHAUL NOTE Be sure to use the correct drawings for the machine being overhauled Refer to Table 2 on page 20 to determine the correct drawing is recommended that a basic overhaul be per formed every two years or 18 000 hours The time inter val between overhauls may vary depending on the con dition of the machine and the severity of service The following basic overhaul procedures include in structions to disassemble clean inspect repair reas semble and test the machine TESTING BEFORE DISASSEMBLY Perform the following tests prior to disassembly of the machine 19 GEK 91584D Vertical Drilling Motor GE752 TABLE 2 DRAWING REFERENCE Inst Book Puller Tools Connection GE752 Longi Comm Pinion Diagram Model tudinal End End Shaft Bearing Grease Arm Coiled Distribution Locking Arrange sembly End End ment Outline Frame As Drive Comm
84. he bear ing cap These bolts are longer and can be identi fied from the factory by their yellow heads 2 Install the two regular bolts which are in a bag at tached to one of the shipping bolts 3 Torque the regular bolts to 115 Ib ft NOTE The shipping bolts and bag should be saved for future armature locking require ments DESCRIPTION 1 BOLT BAG TAG BAG BOLTS AND WASHERS COMMUTATOR END FIG 43 ARMATURE LOCKING ARRANGEMENT 41B535748 CHG 0 E 28735A Vertical Drilling Motor Type GE752 GEK 91584D LOCKING THE ARMATURE FOR SHIPMENT See Fig 43 1 Remove two diametrically opposite bolts in the commutator end bearing cap 2 Install shipping bolts 1 painted yellow with jam nuts 2 applied Torque bolts to 30 Ib ft and tighten the jam nuts CAUTION Do not rotate the armature when the locking bolts are in place Bearing and commutator damage may result 3 Attach the two regular bolts and bag tag 5 to one of the locking bolts 1 SHIPPING Whenever drilling motors are to be shipped they must be properly skidded and secured to prevent any damage in transit The photographs and drawings which follow illustrate a proven method of skidding these ma chines for handing and shipment HANDLING To avoid damage to the machine during handling re view the following cautionary statements 1 Donotlift motors by the shaft extension
85. he outer circumfer ence of bearing cap 8 Lift the armature with the hoist and lifting bail at the drive end Line up the hoist directly over the center of the cavity in the frame Product of NALCO Chemical Co 6 Lower the armature slowly into the being careful not to damage the commutator When the armature is almost fully inserted use the guide studs to align bearing housing 3 and framehead bolt holes 14 7 When the armature has reached its limit of travel remove the guide studs and install bearing cap 8 with a new gasket 11 using bolts and wash ers 10 Draw the bearing housing into framehead 14 Torque bolts to 110 120 ft lbs 8 Install framehead bolts and lockwashers 30 Torque to 440 495 Ib ft CAUTION Alternate tightening of commu tator end bearing housing and drive end framehead bolts Uneven tightening of bolts could damage bearings or related fitted sur faces NOTE Be sure drive end framehead bolt holes are aligned with holes in inner bearing cap be fore assembling bolts and lockwashers 30 9 Use a feeler gauge and check the radial clear ance on the drive end bearing between each bearing roller and the inner race at the top of the bearing Fig 40 Place the feeler gauge between the top roller and the inner race 10 The clearance between the rollers and the inner race should measure between 0 0012 and 0 004 in Try various gauge thicknesses until clearance ca
86. hose 3 Rinse all residue from parts with a mixture of clean steam and water 4 Bake insulated parts for at least 8 hours at 150 C 302 F to remove all moisture Vapor Degreasing Recommended for metal parts 1 Bring the cleaning solution to a boil and allow the vapor line in the tank to rise to the condenser coils at the top of the tank 2 Keep the vaporized cleaning solution at about 120 C 248 F 3 Lower the part to be cleaned into the vapor la den atmosphere so the vapor will condense on the part 4 To speed the removal of heavy dirt accumula tions spray hot solution directly from the tank onto the part being cleaned The temperature of the solution must be kept below its boiling point 5 Remove the cleaned part from the degreaser Drain and cool the part Anti Friction Bearings Shaft Tapers Bearing Fits Use a cleaning solution that leaves an oil film to pro tect finished surfaces from rust Kerosene petroleum spirits or other petroleum base cleaners provide limited protection for these surfaces INSPECTION AND TEST OF DISASSEMBLED MOTOR BEARING INSPECTION 1 Clean the bearings See Cleaning section 2 Inspect for broken or cracked races broken or cracked rollers and balls broken cracked or dis torted retainers scored pitted scratched or chipped races and for indication of excessive Vertical Drilling Motor Type GE752 GEK 91584D wear on rollers and balls Replace the bear
87. ing if any of these conditions is found 3 Look for evidence of smearing caused by inade quate lubrication and corrosion pitting usually at roller spacing caused by moisture or other corrosive agent Replace the bearing if any of these conditions are found 4 Inspect bearing outer races for indentations caused by dirt or foreign material having gone through the bearing If the indentations are small and few in quantity the bearing can be used If the indentations are large and numerous this may be an indication the rollers or cone are start ing to spall out Examine the rollers and cone carefully for spalled areas Replace the bearings if spalled areas are found 5 good bearing parts in a light mineral oil SAE 10 heated to 90 C 194 F to avoid cor rosion before reassembly 6 If a bearing will not be mounted immediately wrap it in an oil proof paper CAUTION Do not interchange bearing parts of different manufacture or mix new and used bearing parts Perform the following inspection and tests to deter mine the condition of the armature coiled motor frame and brushholders After the inspection and test procedures have been completed and all defects or damage noted refer to the REPAIR section for the correct repair procedure ARMATURE Handle the armature carefully during overhaul oper ations to avoid damage to the core banding end turns shaft fits and commutator Support the armature in a sa
88. ing while touching the machine NOTE This type of ground connection is re ferred to in electrical standards as equipment grounding or enclosure grounding which is not to be confused with system or circuit grounding Drilling drive systems normally do not have intentional circuit ground connec tions except through high impedance detec tors Grounding conductors must be provided on drilling units on which the construction of the unit and or the in stallation of the machines do not inherently insure posi tive grounding of the equipment Examples are those portable modular platform rigs and land rigs which do not already have ground cables to all machinery struc tures Offshore rigs with equipment fastened to the PREFERRED CONNECTION TO UNUSED CONNECTION ALTERNATE BOX BUSS CONNECTION POINT MACHINERY BASE COPPER PLATE BOLTED TO UNUSED CHAIN CASE MOUNTING BOSS FIG 2 DRILLING MOTOR FRAME GROUNDING CABLE CONNECTIONS 28717 decks by bolting or welding should not require additional grounding References ABS Rules for Building and Classing Steel Vessels Section 35 9 6 and IEEE Stan dard 45 1977 Recommended Practice for Electrical In stallations on Shipboard Section 21 4 GROUNDING PROCEDURES Fig 2 Most GE drilling machines have extra tap blocks on the frame for mounting of the connection boxes One of these may be used for attaching the grounding cable If one is no
89. layer of absorbent then heat and in x 1 in between terminal surfaces and braze separate the coil connections terminals as follows 2 Heat the coiled frame in an oven at 150 C 302 F for four hours to soften the varnish so pole bolts can be removed 45 GEK 91584D Vertical Drilling Motor GE752 p 15 16 15 29 18 APPLY ONE COAT OF P23 16 15 19 AFTER ALL 18 amp P19 TAPINGS 17 11 37 6 45 24 26 10 18 19 15 16 29 lt VIEW Z OF 3 BRUSH HOLDER CONNECTION 11 45 A1 13 50 F2 12 46 13 50 A2 62 1 22 FILL C BORES 32 35 74 49 WITH 25 VIEW END INSULATE EXCITING amp COMMUTATING FIELD COIL i TERMINALS BY FILLING ALL CAVATIES amp COVERING BEFORE ASSEMBLING ALL BOLT HEADS WITH P24 THEN INSULATE ENTIRE CONNECTIONS INSULATE TERMINALASSEMBLY WITH P18 amp P19 AND THOROUGHLY 9 O CLOCK CABLE SUPPORT BRUSH WITH P23 AS SHOWN WITH P20 TAPED WITH P21 COMM END 15 16 17 18 19 SNC 26 24 SEE NOTE lt D 3 18 19 24 30 31 11 47 3 A1 ae 12 48 d A2 F1 E lt ud 62 13 50 ww F2 22 X ih 8 22 49 2 32 35 74 COMM END 49 VIEW OF PINION END 37 15 16 18 19 24 17 VIEW AT Y OF BRUSH HOLDER CONNECTION 1516 7 11 47 30 FIG 29 COILED FRAME ASSEMBLY 410732353 CHG E 39094A 46 Vertical Drilling Motor Type
90. lides freely in the carbonway 6 Carefully lower the pressure finger on the brush Do not allow the finger to snap down on the brush this could damage the brush 7 Bolt the brush shunt terminals to the brushhol der s Arrange the brush shunt strands so they clear the pressure fingers Fig 6 and tighten the terminal screw s Make sure brush shunts are not positioned under the pressure fingers Check and tighten all brushholder cable connections 8 Seatthe new brushes with a white seater stone CAUTION When replacing brushes use the GE recommended grade Mixing of brush grades in the same motor or changing brushes to another grade will seriously affect commutation surface film commutator and brush life See the DATA section for brush grade BRUSHHOLDER REPLACEMENT Removal 1 Remove brushes from the brushholders and cover the commutator with heavy paper 2 Disconnect the cable from the brushholder s in volved 13 GEK 91584D Vertical Drilling Motor GE752 3 Remove bolt washer and brushholder clamp Lift the brushholder out of the frame Installation Position the brushholder in the frame with the brushholder studs resting in the clamp surfaces of the brushholder support Install bolt and washer Tighten bolt but do not torque until the brushholder to commutator clearance has been established Refer to Brush holder Clearance Adjustment section for instruc tions to adjust brushholde
91. lts 111X910 or equivalent Voltmeter Simpson Multimeter Model 260 or equivalent Puller 016 41 903423 1 Commutator Grinder 427C592G1 Resurfacing Stones Medium Grade 8828492 11 Finish Grade 8828492P8 Brush Seater Stone White 106X98 Lifting P9945894P8 Crows Foot Pressing Tool 41C685430G1 Ball and Socket Tool 41C685080G1 Guide Pins Three 3 Recommended for Armature Asm In Frame 6717114P1 Spanner Wrench 8843522G1 Spring Scale for brush spring pressure check 0 20 Ib capacity Hub Assembly Gauge 41D790941G1 Hub Puller Less Pump 41B535703G1 Pump For Above 8843947G1 Tradename of James G Biddle Co GROUNDING INSTRUCTIONS Grounding motor frames is required to safeguard personnel from electric shock in event of an insulation failure in the machine WARNING Failure to properly ground electrical equipment may expose personnel to a potentially hazardous condition in which serious or fatal in jury from electrical shock is possible Grounding conductors must be provided between the machine frame and the supporting structure to avoid hazardous potential difference between the machine frame and the adjacent surface on which a person may be stand
92. n be determined by the feel of the gauge as the gauge is slowly pulled from between the roller and the inner race 11 Pack 4 8 oz of grease in the outer circumference of outer bearing cap 36 Vertical Drilling Motor Type GE752 GEK 91584D 15 Finish the assembly of grease tube fittings and washer 27 where it passes through the framehead Tighten all fittings and hardware 16 At the commutator end smear the seals on bear ing cap 8 and sleeve 6 with grease NOTE Prior to heating sleeve 6 apply NALCO RC Conditioner to the inside diameter of the sleeve and to the mating surface on the shaft Apply the NALCO with a Scott 150 white paper towel only and allow it to dry to a thin white film on both surfaces before proceeding with Step 18 17 Heat sleeve 6 to 180 C 356 F rise and shrink it onto the shaft tight against the spacer 5 18 Install pipe plugs tubes tube fit tings as indicated in Fig 18 NOTE that grease tubes are packed full of grease BRUSHHOLDER CLEARANCE ADJUSTMENT 1 Remove the protective covering from the com mutator Place a 1 16 in fiber spacer between the bottom of the brushholder and commutator Loosen the brushholder clamp bolts and move the brushholders so they touch the fiber spacer Tighten the clamp bolts to 225 250 Ib ft torque and remove the spacer Connect the cable leads to the brushholder ter minals a
93. nd tighten the terminal bolts BRUSH INSTALLATION 1 Install new brushes Install a new gasket 35 and bearing cap 36 with bolts and lockwashers 34 Torque bolts to 110 120 ft Ibs Smear seals on bearing cap 36 and sleeve 37 with grease Heat sleeve 37 to 110 C 230 F rise and shrink it onto the shaft tight against the roller bearing inner race 38 CAUTION When replacing brushes use only the GE recommended grade Mixing of brush grades in the same motor or changing brushes to another grade will seriously affect commutation surface film commutator and brush life See the DATA section for brush grade 2 Carefully lower the spring loaded brush lever on each brush Do not allow the lever to snap against the brush as the brush may chip 65 GEK 91584D Vertical Drilling Motor GE752 5 Attach the brush shunt terminals to the brush holder body under the screws provided Inspect the interior of the machine for foreign ob jects Install the commutator covers on the motor and check for proper fit and latch operation Clean the terminals HUB MOUNTING Hub Fitting NOTE GE does not supply the hub for vertical drill motors This procedure is included for cus tomer use as a reference when installing the hub To prevent a hub from slipping it should have at least 75 percent fit on the shaft i e at least 75 percent of the tapered bore of the hub shoul
94. ne minute Measure leakage current to ground during this test 5 0 milliamps is maximum WARNING Electric shock can cause serious or fatal injury To avoid such injury personnel should take and observe proper precautions during the high potential testing Resistance Measurement Refer to the DATA section for values and measure the resistance of the exciting and commutating fields VARNISH TREATMENT ARMATURE Vacuum Pressure Impregnation VPI After all repairs have been completed the armature must be vacuum pressure impregnated in GE 702C polyester varnish Refer to GEK 101183 for VPI procedure Following the processing the armature must be given a varnish immersion treatment NOTE Do NOT clean previously protected ma chined surfaces threads and tapped holes be fore varnish treating the armature 56 Varnish Immersion Treatment After VPI Armature The following immersion process must be performed on the armature assembly after the VPI process 1 Preheat the armature an oven at 140 C for at least five hours 2 The temperature of the armature must not be less than 90 C or above 120 C before im mersing Immerse the armature in a vertical po sition commutator end up in the varnish GE Spec No A15B53A for at least one minute NOTE One minute is the minimum time to in sure adequate varnish penetration 3 Liftthe armature out of the varnish and spin until the excess v
95. ng the stones lightly against the commutator Then slowly move the carriage back and forth longitudinally across the surface When the cutting action of the stone ceases again feed the stone lightly against the commutator and continue grinding Use care to make a light cut and to avoid chatter Cutting action should take place at the trailing edge of the stones Heavy cuts will cause exces sive copper drag Grind the commutator to obtain a uniformly smooth surface but do not remove any more copper than necessary Lighten the cutting pressure on the stones near the end of the grinding operation If medium grade stones were used stop the motor change to finish grade stones and repeat Steps 1 2 3 and 4 After the final cut traverse the stones back and forth without changing the feed until cutting action ceases Remove power from the machine Check commutator runout with a dial indicator Refer to the DATA section for concentricity limits SCREWDRIVER BLADE OR TOOL STEEL BAR GROUND TO 60 ANGLE FOR RAKING SLOTS r 0 188 80 0 188 1 32 RADIUS 0N 4 76 ALL DIMENSIONS IN INCHES SIDE VIEW WITH MILLIMETERS IN PARENTHESES FIG 12 COMMUTATOR SLOT RAKING TOOL 10 19771 If necessary continue grinding to meet tricity values listed in the DATA section Remove the grinder See Fig 12 for slot raking tool Rake the commu tator slots to remove projecting mica fins or cop
96. o personnel in the im mediate area Personnel should be provided with and trained in the use of personal pro tective equipment as specified by applicable federal or state safety regulations 3 Run the motor at approximately 1000 rpm 4 Hold the stone firmly against the commutator surface and with even pressure move the stone back and forth longitudinally across the commu tator surface 5 Blow away dust and sand with clean dry com pressed air HANDSTONE SPAN OF CONTACT FIG 10 PROPER SHAPE OF HANDSTONE E 8779A 16 WARNING Do not come into close proximity of an energized motor during the cleaning pro cess The armature commutator and brush rig ging have a high electrical charge which could cause serious injury or death Always use a hose tip that is an electrical non conductor when cleaning with air WARNING When using compressed air for cleaning purposes flying debris and particles may present a hazard to personnel in the im mediate area Personnel should be provided with and trained in the use of personal pro tective equipment as specified by applicable federal or state safety regulations Fixture Grinding Perform fixture grinding operations to correct a commutator that is grooved threaded or out of round CAUTION Be sure there is enough material the commutator so grinding will not decrease the commutator diameter below the minimum permissible diameter listed in the DATA s
97. of the ar mature 2 Do not allow the armature to bump another ob ject 3 Do not tighten coupling assembly bolts with an air wrench or by pounding 4 Do not remove armature end play by any other means than axial blocking 5 Donotload the armature radially strap down for shipment CLEANING AND SLUSHING Before skidding the machine for shipment all ex posed finished surfaces not already painted should be cleaned and slushed as follows 69 GEK 91584D Vertical Drilling Motor GE752 1 Remove all corrosion 2 Wipe off the surface with clean rags and wet with petroleum spirits GE D5B8 3 Follow with a clean rag wet with methanol then wipe dry DO NOT touch the cleaned surface with bare hands 4 Slush immediately after cleaning with GE D6C6A1 slushing compound SKIDDING Use yellow pine timbers large enough to support the weight of the machine The recommended size is illus trated in Fig 44 PROTECTION When any apparatus is shipped in the open it should be fully protected from rain snow dirt etc by covering with some suitable weatherproof material ARMATURES To prepare drilling motor armatures for shipment or storage clean slush and wrap the armature Then se r 3 4 DIA 4 HOLES 25 1 4 gt lt 23 1 2 FIG 44 CONSTRUCTION DETAILS 7754 70 curely support and enclose the armature in a totally en closed wooden box
98. off shut down the field supply ARMATURE Sanding Procedure If the commutator is dirty blackened or slightly FIG 7 DIAGRAM OF CONNECTIONS TO RUN rough resurface it by sanding with 00 sandpaper or fin A SERIES MACHINE FROM A WELDING SET er as follows 28718 leads so machine will operate as a series motor and the armature will rotate counterclockwise 1 Attach the fine sandpaper to a wooden block shaped to fit the commutator Fig 9 viewed from the commutator end 2 Runthe machine at approximately 1000 rpm and hold the block against the commutator with a Preparation For Operating Shunt Model light even pressure Move the block back and Machines For Commutator Resurfacing forth longitudinally to clean the commutator 3 Use clean dry compressed air to remove dust 1 Breakthe coupling if applicable so the machine and sand can be run from d c power source 2 Lift all brushes except two of opposite polarity Hand Stoning Procedure adjacent brushholders which are necessary to operate the motor If the commutator surface is mildly grooved threaded or burned and only a small amount of copper 3 the machine to an outside source of has to be removed to correct the trouble use a hand controlled d c power Fig 8 stone Hand stoning will not correct an out of round commutator See Fixture Grinding section 4 Apply power as follows 1 Use afine grade stone ground to fit the
99. onsideration must be given to bearings and lubricants Not only can bearing lubricants be damaged by heat but they can also deteriorate with age For this reason it us usually best to remove bear Refer to Figs 48 and 49 for outline drawings ings before drying and repack with new grease before reassembly e If facilities are available give the reas sembled machine a running test to check the bearings 73 GEK 91584D Vertical Drilling Motor GE752 ONE 25 PIPE PLUG REPLACE WITH GREASE FITTING FOR REGREASING ALL MODELS EXCEPT UP2 AUP1 AND AUP2 50 1 3 1 00 15 09 2 25 DIA 3 HOLES BHO FOR LIFTING AIR OUT 25 4 CORNERS 25 16 82 375 24 THD UB MODEL F G BOTH ENDS UP1 75 10 22 12 16 50 AUP1 THRU oar 018 002 UP2 3 amp 4 1 0057 000 22 124 16 500 2 8 3 DIA THRU 22116 A 8 C 004R 06 THICK TERMINALS FOR NO 10 SCREW ON 37 24 CABLES EXTENDING 10 FEET FROM FRAME FIG 1 GE 752 UP SAME AS GE 752 AUP EXCEPT F1 AND F2 CABLES AS SHOWN FIG 48 OUTLINE UP AND AUP 41E903631 CHG H E 28755B 74 Vertical Drilling Motor Type GE752 GEK 91584D NOTE FOR ARMATURE LOCKING ARRANGEMENT LOCATED ON COMMUTATOR END ONE 25 PIPE PLUG REPLACE G TO BE
100. or NOTE Outside power will be required to oper ate the motor for the following commutator re surfacing procedure WARNING For the safety of personnel during resurfacing operations the following safety precautions must be adhered to 1 A second person must be the auxiliary power welder control station ready to shut off power in case of an emergency during the grinding operation The grinding operator should wear goggles and dust mask when resurfac ing or blowing out the commutator To avoid electrical shock do not touch any part of the machine interior during grinding operations Preparation For Operating Series Model Machines For Commutator Resurfacing 1 Break the coupling if applicable so the machine can be operated from a welding set or other outside power source Lift all the brushes except two of opposite polarity adjacent brushholders which are necessary to operate the motor Connect the machine to an outside source of controlled d c power such as a 3 5 kw 100 vdc welding set which is capable of driving it at a speed of 900 1000 rpm Refer to Fig 7 for diagram of connections to run a series machine from a welding set Connect Vertical Drilling Motor Type GE752 GEK 91584D SERIES D C WELDER SET NOTE When shutting down increase the field MACHINE GENERATOR supply to maximum and then turn off the arma A2 ture supply After the armature supply has been shut
101. per whiskers Run the machine again at 1000 rpm and polish the commutator with 00 sandpaper crocus cloth or 400A Triemite paper The abrasive sheet should be mounted on a wooden block curved to fit the surface of the CAUTION Never use an emery cloth on this or any commutator The abrasive particles on emery cloth scratch the commutator surface and lodge in the grooves between commuta tor segments This condition creates the pos sibility of an eventual flashover which could seriously damage the machine 11 12 Blow the dust from the commutator and the inte rior of the motor with dry compressed air Hold the air nozzle one to two inches from the surface of the commutator and sweep nozzle longitudi nally to dislodge copper chips and mica dust Air cure the commutator See the following sec tion for air curing instructions Product of Minnesota Mining and Manufacturing Co WARNING When using compressed air for cleaning purposes flying debris and particles may present a hazard to personnel in the im mediate area Personnel should be provided with and trained in the use of personal pro tective equipment as specified by applicable federal or state safety regulations Air Curing Commutator After the commutator has been sanded stoned or ground and blown clean it should be air cured as fol lows 1 Rotate the armature slowly with the same source of power used for sanding stoning
102. r a cloth dipped in an approved non oily cleaning sol vent Inspect the brushholder cables and make sure all terminal bolts and all brushholder clamp bolts are tight Brush Spring Pressure Lift the brush pressure fingers to the toggled up position Fig 5 and check for free movement of the spring assembly Inspect the brush springs for obvious failure or dam age Check brush spring pressure by comparing spring pressure with a spring known to be good Refer to the DATA section for brush spring pressure value BRUSH PRESSURE FINGER IN TOGGLED UP POSITION PRESSURE SPRING TEFLON M SLEEVES j CARBONWAY BRUSH SHUNT TERMINAL SCREWS FIG 5 BRUSH SPRING ARRANGEMENT 18963 Product of duPont de Nemours Company 11 GEK 91584D Vertical Drilling Motor GE752 Brushes Brush wear is determined by measuring actual brush length from the top of the carbon Lift the brush spring remove the brush and measure brush length on the longest side NOTE If brush replacement is not required be sure that brushes are of sufficient length to last until the next inspection If one or more brushes are worn to or near the mini mum length listed in the DATA section it is generally rec ommended that all twelve brushes be replaced at the same time WARNING To avoid possible electrical shock or injury from rotating equipment do not remove or replace brushes while equipment is energized or rota
103. r clearance After brushholder clearance has been set con nect the brushholder cable and remove protec tive paper from commutator surface Check brushes to insure they exceed the mini mum brush length dimension and are free of any damage If they are long enough and are not damaged they can be re used If not replace with new brushes BRUSHHOLDER CLEARANCE ADJUSTMENT Refer to the DATA section for the brushholder to commutator clearance dimension and adjust brushhol der as follows 1 Remove the brushes CAUTION Do not allow the brushholder to touch bump or rest on the commutator 2 14 Insert a fiber gauge equal in thickness to the clearance dimension between the commutator and the brushholder Loosen brushholder first if below minimum allowable clearance Do NOT use a metallic gauge Loosen the brushholder support bolt and move the brushholder against the fiber gauge so clea rance to commutator is the same as the gauge thickness Torque bolt to 225 250 ft Ib and recheck the brushholder clearance gap COMMUTATOR RESURFACING Prior to resurfacing consider the following 1 The brush surface diameter of the commutator must not be less than the minimum permissible diameter listed in the DATA section after resur facing operations are completed The commutator can be resurfaced by sanding stoning or grinding Choose the method to be used based on the condition of the commutat
104. rations listed under Monthly section 2 Refer to the DATA section for the Brushholder Clearance dimension and check the clearance between the brushholders and the commutator surface If clearance adjustment is required refer to the BA SIC REPAIRS Brushholder Clearance Adjustment sec tion for instructions BASIC REPAIRS BRUSH REPLACEMENT NOTE Brush spring pressure is pre set and non adjustable for the brushholders used on these machines Any brushholder that is dam aged or has a low spring pressure should be re placed before installing new brushes Spring pressure can be measured with a 20 Ib spring scale pulling radially on the brush pressure fin Vertical Drilling Motor Type GE752 GEK 91584D ger over the center of each brush See the DATA section for limits 1 Remove the commutator inspection covers 2 Disconnect the brush shunt from the terminal screw Fig 5 located on the brushholder body 3 Lift the pressure finger away from the brush to the toggled up position Remove the brush 4 Use dry compressed air and blow the carbon dust from the carbonway WARNING When using compressed air for clean ing purposes flying debris and particles may present a hazard to personnel in the immediate area Personnel should be provided with and trained in the use of personal protective equip ment as specified by applicable federal or state safety regulations 5 Insert a new brush and make sure it s
105. re impregnated See the Varnish Treatment Vac uum Pressure Impregnation section for fur ther required processing of the armature WARNING Personal injury may result if prop er eye protection is not worn when cleaning with compressed air CAUTION Never use an emery cloth on this or any commutator The abrasive particles on emery cloth scratch the commutator surface and lodge in the grooves between commuta tor segments This condition creates the pos sibility of an eventual flashover which could seriously damage the machine A MICA PROPERLY UNDERCUT B UNDERCUTTING TOOL TOO NARROW LEAVING FIN AT ONE SIDE OF SLOT C UNDERCUTTING TOOL VERY NARROW LEAVING FINS AT BOTH SIDES OF SLOT D SLOT IMPROPERLY INDEXED PART OF BAR CUT AWAY AND FIN OF MICA LEFT E TOOL TOO WIDE PART OF BAR CUT AWAY F UNDERCUTTING TOO SHALLOW SERVICE LIFE SHORTENS BEFORE NEXT UNDERCUTTING G UNDERCUTTING TOO DEEP POCKET COLLECTS CARBON AND COPPER DUST SHORT CIRCUITING TEST AFTER REPAIR Armature High Potential Test BARS FIG 28 COMMON MISTAKES IN UNDERCUTTING COMMUTATOR SLOTS Apply test voltage between the commutator with all E 5024A segments shorted and the shaft 44 Vertical Drilling Motor Type GE752 GEK 91584D Remove the pole bolts and the coil pole assem bly from the magnet frame MOTOR FRAME FIELD COIL REPLACEMENT 3 Mark any shims for reassembly with the corre Refer to Table 2 Page 20
106. restored according to the following instruction unless more than 1 4 in buildup of metal is required in the affected area in which case the brushholder should be scrapped Proceed as follows 1 Thoroughly clean the affected area by wire brushing and grind off any metal flow resulting from a flashover 2 Apply a suitable brazing flux such as GE A10B15 to the area to be built up 3 Insert a carbon brush into the brushholder to pre vent the brazing material from flowing into the carbonway 4 Using a brazing torch and a 1 16 in diameter brass brazing rod puddle in sufficient metal to restore the metal that had been removed 5 Check the carbonway for size with the Go No Go gage after the brushholder has cooled to room temperature 6 Resize as required using the preceding method Brushholder Sleeves Use a clean lintless cloth and wipe dirt and grease from the Teflon brushholder sleeves Fig 5 If neces sary use a cleaner such as MEK methyl ethyl ketone to clean the sleeves Inspect sleeves for cracks and thin Vertical Drilling Motor Type GE752 GEK 91584D spots caused by flashovers Replace any damaged brushholder or one having a damaged sleeve WARNING MEK is a volatile solvent The fumes should not be inhaled Use only in a well venti lated area and take adequate precautions to pro tect eyes skin and hands NOTE Never paint these sleeves Periodically wipe them clean with a dry cloth o
107. rod to check for noisy bearings 6 Stop the machine and mount an indicator on the frame While turning the armature by hand mea sure commutator runout It should not exceed 0 001 in 7 Measure field impedance With 60 Hz and 24 amperes through each field measure the volt age drop across total exciting and commutating fields See the DATA section for voltage limits 8 Apply a high potential test to the windings of the assembled machine as specified in the DATA section WARNING Electric shock can cause serious or fatal injury Proper precautions should be taken and observed by personnel performing testing to avoid such injury TESTING SHUNT MACHINES Models 5GE752UP and US After the motor has been reconditioned and reas sembled for service make the following tests to be sure it will operate satisfactorily Connect the motor to a d c welding generator Refer to connection diagrams Figs 21 and 23 for connec Product of Johns Manville Co 68 tions Run the machine by separately exciting the shunt field from a 125 vdc source From another source of power apply voltage to the armature circuit until the de sired speed is obtained Motor Operation Ventilated 2300 cfm at 7 6 in H20 at Commutator Chamber Hold separate field excitation at 50 5 amperes Vary the armature voltage to obtain the required rpm At ap proximately 700 terminal volts no load the speed will be 900 rpm Unventilated
108. shown by the shaded area in the bearing cap Install the inner bearing cap on the sleeve Heat and install the flinger tight against the sleeve Heat and install the inner race of the roller bear ing tight against the flinger Install the outer race of the bearing in the framehead Fill the roller bearing completely with 29 0 oz of grease Install the gasket onto the inner bearing cap Install guide pins into the inner bearing cap to guide the framehead into position Assemble the framehead bearing assembly onto the shaft over the guide pins until seated against the bearing cap Remove the guide pins NOTE Orient the inner bearing cap on UP AUP US and AUT models to facilitate grease tube as sembly Vertical Drilling Motor Type GE752 GEK 91584D 13 14 Assemble the grease tubes to the inner bearing cap a On UP1 and AUP1 models there are two grease tubes assembled to the inner bearing cap and protrude through a hole in the frame b On UP2 and AUP2 models there is one grease tube assembled to the inner bearing cap and protrudes through a hole in the frame c On all other models there is one grease tube assembled to the inner bearing cap and pro trudes through a hole in the framehead Pack 4 8 oz of grease in the outer circumference of the outer bearing cap and install the bearing cap to the framehead Secure the assembly with bolts and lockwashers Torque to the appropriate val
109. t available use the lower chain case mounting boss on the end opposite the drive end in accordance with Step 2 1 To attach the ground cable to a tap block obtain 0 75 10 bolt with length of 1 0 to 1 5 in anda lockwasher Also obtain a cable lug to fit the ground cable and large enough for the 0 75 di ameter bolt 2 Toattach the cable to the chain case boss obtain 1 25 7 bolt with length of 1 0 to 1 75 in and a lockwasher Prepare a copper plate at least 1 8 in thick with a 1 25 in diameter hole for bolting to the chain case boss and with enough extra area for holes to attach a cable lug Drill hole s in plate for cable lug Clean all paint rust and oil from the chain case boss and bolt the copper plate to the chain case boss 3 Prepare a ground conductor long enough to run from the motor frame to an existing ground con ductor system or to a suitable equipment ground point as defined by the National Electrical Code Article 250 or other applicable regulation Check that the system ground detector is also con nected to the Common ground point for the rig and make connection if necessary 4 Install terminal lugs on cable Remove paint rust and oil from the surfaces to which the cables are to be attached and bolt the lugs securely to these surfaces Use 4 0 size or larger copper cable for GE752 ma chines Reference National Electrical Code 1978 Edition Table 250 95 Vertical Drilling Motor Type GE752 GE
110. tact of solvent with the skin Do not expose solvent to flame or sparks Observe caution statements issued by the manufacturer of the solvent Extreme care should be exercised not to dam age critical machined surfaces such as the ta pered shaft surface while removing rust The surfaces should be reslushed with GE D6C6A1 FIG 47 SHIPPING BOX WITH ARMATURE LESS COVER 3784 slush compound Kendell Grade 5 or the equiva lent Brushes should be removed from their holders and clamped under the spring clips to prevent corrosion of the commutator surface as a result of moisture absorption by the carbon Do not completely seal the motor but cover ma jor vent areas with a waterproof shipping tape Leave enough opening so the machine can breathe i e moist air is not trapped The inten tion is to prevent entrance of water dust small animals etc but not to seal airtight GE does not recommend the use of a silica gel or dehydrating agent Since the lubricant drains from the top half of bearings during storage this area is subject to corrosion The shaft should be rotated periodi cally to redistribute a protective film If stored in side rotate every three months If outside every month Before placing the machine back into service after prolonged storage 1 year or more bearings should be inspected and repacked with new grease meeting the recommended GE lubri cation specification The machine should be meg
111. the minimum permissible diameter listed in the DATA section the commutator must be replaced After a long period of service the mica insulation may relax due to temperature cycling and relieve com mutator assembly pressure This could result in a loose commutator with raised bars or an out of round com mutator The assembly pressure can be restored by tighten ing the commutator bolts This must be done before un dertaking any resurfacing operation on the commutator Procedure 1 Chip the weld from the commutator bolt heads to free bolts from the cap 38 2 Torque the commutator bolts by one of the fol lowing methods Hydraulic Press Preferred Method 1 Clean the front face of the cap and the segments Fig 25 Remove ONE bolt at a time and lubri cate the bolt threads and under the bolt head See Lubrication of Bolts section Follow the se quence shown on Fig 27 for bolt removal Reas semble bolt and tighten to the initial breakaway torque value 2 Using a depth micrometer measure the distance X in Fig 25 between the face of the cap and the segments at four points 90 degrees apart The face of the cap and the segments should be par allel within 0 020 in If necessary tighten the ap propriate cap bolts to obtain this parallel relation ship between the face of cap and the segments 3 Place the armature a vertical press Position ball and socket tool Part 41C685080G1 and crow foot pressing
112. ting If brushes are to be replaced see the BASIC RE PAIRS Brush Replacement section for brush installa tion instructions If brushes are not to be replaced the following brush inspection should be made CAUTION When replacing brushes use only the GE recommended grade Mixing of brush grades in the same motor or changing brushes to anoth er grade may seriously affect commutation sur face film commutator and brush life See the DATA section for brush grade 1 Inspect all brushes to be sure they are not chipped or broken Make sure brush shunts are not frayed or broken Replace any brush which shows damage of any kind NOTE Chipped burned or rough faced brushes may indicate the commutator needs resurfacing 2 Move the brushes up and down in their carbon ways to be sure brushes slide freely 3 Check brush shunts to be sure they are not twisted or out of position Fig 6 Make sure all 12 brush shunt terminal connections and all brush holder cable connections are tight Commutator Inspect the commutator for possible flashover dam age The commutator should be clean smooth glossy and free of high mica high bars flat spots or rough sur faces If there are indications that the commutator is out of round as evidenced by variations in width of the ridge between brush paths check the concentricity of the commutator with a dial indicator Condemning limits for concentricity are listed in the D
113. tion details Glass Band Commutator End Inspect the glass bands for split frayed or loose con dition Wire Band Drive End Inspect the wire band for physical damage loose tie clips or broken wire Creepage Band Inspect the surface of the Teflon creepage band for possible flashover damage Tap the band lightly and 32 check for movement of the band to determine if loose If the band is loose or has deep burns replace it See RE PAIR section for instructions COMMUTATOR Check the commutator for threading pitting groov ing burns flat spots high bars and copper drag Check the commutator to make sure that it is not out of round See the DATA section for concentricity limits Resurfacing For the resurfacing procedure for a commutator see REPAIR Armature section Refer to the DATA section for the minimum permissi ble commutator diameter dimension and check the di ameter of the commutator NOTE If the brush surface diameter will be less than the minimum permissible diameter after resurfacing operations are performed the com mutator must be replaced Tightening If the commutator is loose has high bars see the REPAIR Commutator Tightening section for instruc tions to tighten the commutator ARMATURE SHAFT INSPECTION Armature shaft bearing fit dimensions can be checked and compared to armature shaft drawings pro vided in Fig 20 If the bearing fit dimensions are not within stated
114. tolerances the shaft must be replaced or repaired Refer to Table 2 to determine the correct shaft drawing for the machine being repaired MOTOR FRAME 1 Check the connection strap insulation for dam age signs or burning cracks or discoloration 2 Check the insulation on the coils for damage signs of burning cracks or discoloration 3 Checkthe lead cables for damage overheating and signs of deterioration AROUND BUTTED JOINT OF 48 T 1 4 lt 37 Vertical Drilling Motor Type GE752 GEK 91584D 3 4 REF PETA ASSEMBLE AROUND BUTTED JOINT OF PT48 61 49 60 78 1 4 48 77 A ASSEMBLE IN LINE 1 WITH NO 1 SLOT 17 71 ENT LC 5 11 a 16 68 69 29 33 13 32 3 32 52 EXTEND A THIN COATING 76 OF PT32 OVER TOP OF 8 9 65 EQUALIZERS BOTH DECKS 70 67 3 4 LAPPED P70 TO BE APPLIED 28 ACTIVE TURNS AT 68 TO LEVEL 54 NOTE FOR 54 MATL 41B537080P1 ALT MATL 41A230144P3 57 NOTE FOR P57 MATL 41 230144 40 TOP COILS 400 350 LB TENSION OVER TOP OF EQUALIZERS EQUALIZER CONNECTIONS 11 14 0 29 VAL BOTTOM COILS TO 92 NUMBERED SEGMENTS ARE FOR PURPOSE OF INDICATING SPAN OF EQUALIZER CONNECTIONS AND DO NOT NECESSARILY CORRESPOND TO NUMBERED SEGMENTS IN MAIN CONNECTION DIAGRAM 30 NOTE FOR P62 APPLY TO SIDES OF CORE SLOT ON PINION END ONLY IN
115. ue for all bolts is obtained 5 Check the dimension between face of cap and segments to assure these surfaces are parallel within 0 020 in NOTE Do not tack weld the bolts to the com mutator cap before spin seasoning or resurfac ing operations are performed Refer to following sections for instructions to spin season and resurface the commutator Spin Seasoning Commutator Assembled On Armature commutator seasoning cycle is required after com mutator tightening operations have been performed Prior to spin seasoning dynamically balance the ar mature to within 12 grams on the commutator end and 10 grams on the drive end Refer to longitudinal section for balance weight locations see Table 2 to determine the correct drawing To spin season the commutator place the armature in a spin seasoning stand and proceed as follows 1 Heat the commutator to 155 165 C 312 330 F in 60 minutes at 2940 rpm Spin at 155 165 312 330 F for 60 minutes at 2940 rpm Cool to 50 C 122 F maximum in 30 minutes at 2940 rpm 2 Allow the commutator to cool and grind cold See Commutator Resurfacing section Vertical Drilling Motor Type GE752 GEK 91584D 3 Heat the commutator to 155 165 C 312 3302 F in 60 minutes at 2940 rpm Spin at 155 165 312 330 F for 30 minutes at 2940 rpm Cool to 50 C 112 F maximum 30 minutes at 2940 rpm Repeat for a total of 2 cycles 4 Heat the commutator to 14
116. ue in Table 3 Page 37 Commutator End Bearing All Models Except US2 UP6 AUT2 and AUP5 Refer to Fig 38 1 Clean and inspect the bearing and the shaft bearing fit Remove nicks and burrs If sleeve 16 was removed heat it to 110 C 230 F and shrink it tight onto the shaft against the shoulder Pack 5 25 oz grease into the outer circumfer ence of the cavity of bearing housing 8 Heat bearing housing 8 in an oven to 100 C 212 F While hot assemble ball bearing 3 into the housing firmly against the shoulder at the bottom of the bearing fit Fill all voids in the ball bearing completely with approximately 20 8 oz of grease Fig 38 Smear 0 5 oz of grease on the bearing housing and the bearing cap seals Heat the bearing and housing assembly in an oven to 100 C 212 F While hot assemble it onto the shaft with the inner race tight against sleeve 16 57 GEK 91584D Vertical Drilling Motor GE752 USE 4 8 02 GREASE IN THIS CAVITY FORM TO CLEAR 1 ARMATURE COIL FILL ALL VOIDS IN BEARING WITH GREASE APPROXIMATELY 29 0 02 USE 4 8 07 OF GREASE IN THIS CAVITY REF DESCRIPTION 1 GREASE TUBES 2 e eo n5 SMEAR 0 50 OZ OF GREASE MODELS ON GREASE SEALS SEE TABLE 2 PAGE 20 FIG 34 DRIVE END BEARING ASSEMBLY 18166 NOTE Do not heat the bearing and housing as 7 Heat
117. y be reproduced free of charge by General Electric Company customers OEM s and their customers if such reproduction is used exclusively in connection with equipment used those customers internal operations These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation operation or mainte nance Should further information be desired or should particular problems arise which are not covered sufficiently for the user s purposes the matter should be referred to the General Electric Company Any applicable Federal State or local regulations or company safety or operating rules must take precedence over any instructions given in this material GE has no obligation to keep the material up to date after the original publication THERE ARE NO WARRANTIES OF ACCURACY MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE Verify numbers for parts tools or material by using the Renewal Parts or Tool Catalogs or contact your General Electric repre sentative for assistance Do not order from this publication GEK 91584D Vertical Drilling Motor Type GE752 FIG 1 GE752 VERTICAL DRILLING MOTOR E 39088 INTRODUCTION GE752 drilling motors designed for vertical opera tion Fig 1 are available in GE s UP AUP US and AUT series This instruction provides inspection mainte nance and basic overhaul procedures for all of thes

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