GH40 Service Part C
Contents
1. Install a bearing race in the top plate in the same manner as the bottom plate Pack both tapered roller bearings either by hand or with a wheel bearing packer with wheel bearing grease Fig 18 3 Make sure the bearings are thoroughly packed Excess grease however on the inside and outside of the bearing is not desirable as it will leak out of the hex gear drive during operation Lay one bearing in the race installed in the bottom plate Fig 18 4 Make sure that both the hex drive gear Fig 18 5A and the inner race surfaces where the hex drive gear mates with the inner bearing race Fig 18 5B are free of grease This is critical to the maintenance of proper clearances during assembly You ve had to read through a lot of instructions to get this far This would probably be a good time for a cup of coffee or a soda Pull up a chair no photo required and take a rest Slide the long stem of the hex drive gear through the bottom bearing Fig 18 6A until it seats completely There should be no clearance between shoulder of hex drive gear and the inner bearing race Fig 18 6B Install the two gear box alignment pins in the aluminum gear drive box with a brass hammer if they were removed or fell out during disassembly Fig 18 7 The pins should protrude an equal distance approximately 5 16 from each side of the drive gear box Position the bottom plate so that the detent ball in the latch or its indenture in the bottom plate i2. Fig 17 1 Remove hammer member Fig 17 3 Remove chain cover plate Fig 17 4 Loosen set screws at base of 12 tooth sprocket Service Manual Rotation Member Page 61 Geoprobe GH 40 Hammer Fig 17 5 Remove socket head cap screws Fig 17 6 Lift hydraulic motor off gear from hydraulic motor mounting holes drive box BEFORE aly PROBE INTO Ea D mej Fig 17 7 Remove 12 tooth sprocket from hydraulic Fig 17 8 Rest hydraulic motor on control panel motor shaft Service Manual Rotation Member Page 62 Geoprobe GH 40 Hammer Fig 17 9A Remove lower mounting Fig 17 9B Remove lower mounting bolts bolts Fig 17 10A Lift rotation member out of hammer cradle Fig 17 10B Hammer member rotation member and hydraulic motor removed from hammer cradle Service Manual Rotation Member Page 63 Geoprobe GH 40 Hammer Fig 17 11 Remove bolts and lock washers from top plate ia zi ae a a Fig 17 13 If necessary pry top plate away from gear drive box with screwdriver Fig 17 15 Lift gear drive box off bottom plate Service Manual Rotation Member Page 64 Fig 17 12 Gently tap bolts to separate plates from gear drive box Fig 17 14 Remove top plate from gear drive box Geoprobe GH 40 Hammer Fig 17 16 Pull hex drive gear out of Fig 17 17 Remove bearings from hex bottom plate drive Fig 17 18 Remove top and b
3. October 1994 Geoprobe GH 40 Soil Probing Hammer Operating Instructions Geoprobe Systems October 1997 1998 99 Equipment and Tools Catalog Service Manual Page 95 Geoprobe GH 40 Hammer Geoprobe Systems Corporate Headquarters 601 N Broadway Salina Kansas 67401 1 800 GEOPROBE 1 800 436 7762 785 825 1842 Fax 785 825 2097 Hydraulic Probing Machines Small Diameter Sampling Tools Direct Sensing and Logging Tools
4. gear drive Fig 18 22B Reinstall lower mounting bolts Fig 18 24 Reinstall hydraulic motor Fig 18 25 Reinstall hammer member Service Manual Rotation Member Page 75 Geoprobe GH 40 Hammer Fig 18 26 Reattach hammer inlet and Fig 18 27 Hammer member rotation return hoses member and hydraulic motor reattached to hammer cradle Service Manual Rotation Member Page 76 Geoprobe GH 40 Hammer 19 0 HAMMER LATCH REMOVAL NOTE The following procedure for hammer latch removal occurs with the hammer member and rotary member removed from the probe unit IMPORTANT Wear safety glasses while removing hammer latch NOTE Thehammer latch is equipped with a spring and detent ball assembly which serves as a latch stop in the rotated position The spring and detent ball are located inside the hammer latch and apply pressure to and engage the indenture in the hammer latch extension on the bottom plate of the rotation member When the hammer is installed on the probe unit the detent ball and its indenture are located on the left side of the unit opposite side of the hammer from the control panel 19 1 Place hammer rotation member on work bench 19 2 Loosen both socket head shoulder bolts with a 7 16 hex bit and socket wrench Fig 19 1 The socket head shoulder bolts are installed at the factory with Loctite Removable Threadlocker and will require significant effort to remove 19 3 Remove both socket head shoulder bolt
5. gear drive box Fig 18 14 18 18 Before the top plate is installed on the gear drive box make sure that the bolt holes line up properly 18 19 Align the bolt holes and install the top plate on the gear drive box Fig 18 15 18 20 Secure bottom plate gear drive box and top plate with the four original bolts and lock washers Fig 18 16 Evenly and securely tighten bolts in a crisscross pattern with a 3 4 socket and 1 2 drive socket wrench 18 21 Check hex drive gear for proper rotation Hex drive gear should rotate by hand If it does not install a drill steel If the drill steel will turn by hand or with slight effort on a 1 open ended wrench the bearing adjustment is still within tolerance Fig 18 17 Ifthe hex drive gear will not turn using the wrench bearing preload is too tight and a thicker shim should be used For example replace a blue 005 shim with a brown 010 shim At no time should the hex drive show any sign of lateral movement side to side fore or aft Ifthe hex drive does show lateral movement use a thinner shim For example replace a brown 010 shim witha blue 005 shim Either the top or the bottom plate shim can be removed and replaced to achieve the proper tolerances At no time should the rotation member be assembled without shims between the upper and lower plates and the gear drive box The shims also serve as gaskets consequently their absence will cause leaks from the outside as well as the inside of the
6. seal is leaking Lunch time and operator s stomach is growl ing Bearings need to be replaced or adjusted Drive chain is slack Page 93 Move control lever to Rotate See Section 15 0 See Section 12 0 See Section 17 0 or send rotation member to factory See Section 4 0 Section 11 0 Steps 7 amp 8 Section 17 0 Steps 11 amp 12 and send rotation member and valve and hydraulic motor to factory Move control lever to Hammer See Section 7 0 See Section 8 0 See Section 4 0 and send hammer member to factory See Section 5 0 See Section 5 0 See Section 10 0 to replace O rings Tighten fittings or replace damaged fittings Allow grease to work itself out See Section 4 0 and send hammer to factory Close manual deactivate hydraulics eat lunch See Section 17 0 and Section 18 0 to replace or adjust bearings See Section 15 0 to tighten chain Geoprobe GH 40 Hammer ADDITIONAL TROUBLE SHOOTING TIPS SITUATION PROBLEM SOLUTION Hammer anvil stuck in anvil recepticle Hammer is hammering but doesn t drive anything Hammer working intermittently slowly or not at all Hammer gets too hot when ham mering Hammer gets too hot when ham mering Hammer latch will not swivel up or down Hammer anvil retainer cap will not go on or come off Debris has accummulated around anvil Hammer anvil is missing Lack of nitrogen in sy
7. 4 14 Fig 18 24 Remember all hydraulic connections remain intact during this procedure 18 30 Install hammer member See Section 7 0 Hammer Member Installation Fig 18 25 18 31 Reattach marked hammer inlet and return hoses to their respective positions Fig 18 26 18 32 The hammer member the rotation member and the hydraulic motor should all be reattached to the hammer cradle Fig 18 27 18 33 Check all bolts and fittings for tightness 18 34 Installation of gear drive bearings and seals is complete Fig 18 2 Fully seat race against shoulder in bottom plate Fig 18 3 Pack tapered roller bearings with wheel Fig 18 4 Lay bearing in race in bottom plate bearing grease Service Manual Rotation Member Page 69 Geoprobe GH 40 Hammer Fig 18 5A Make sure hex drive gear is free of Fig 18 5B Make sure inner race surfaces are free grease of grease Fig 18 6B Hex drive gear seated through bottom bearing Fig 18 6A Sliding long stem of hex drive gear through bottom bearing Fig 18 7 Reinstall gear box alignment pins if necessary Service Manual Rotation Member Page 70 Geoprobe GH 40 Hammer Fig 18 8 Position bottom plate so detent ball Fig 18 9A Mating surface of bottom plate should indenture is on left side of plate be free of grease Fig 18 9B Mating surface of drive gear box should Fig 18 10A Inner bearing race mating surface be free of grease should be fr
8. MOVAL OF HAMMER BRACE ASSEMBLY This section lists the procedure for removing a Hammer Brace Assembly P N 5904 from the GH 40 Soil Probing Hammer Refer to Figure 23 1 as needed 23 1 Unfold the probe assembly and position the hammer at a comfortable working height about waist level 23 2 Remove the bolt and lock washer from the lower end of each hammer brace using a 3 4 wrench or socket 23 3 Remove the hex nut and lock washer from the hammer top mounting bolt with a 15 16 wrench or socket Take off the left hammer brace 23 4 Slide the top mounting bolt out of the hammer cradle and take offthe remaining hammer brace Slightly loosen the two base plate bolts to relieve pressure on the top mounting bolt if necessary 23 5 Removal of the Hammer Brace Assembly is complete Lock Washer 5 8 in Hammer Brace SS Top Mounting Bolt 5 8 in x 7 in Bolt 1 2 in x 1 1 4 in k o Lock Washer 1 2 in Angled end of brace Base Plate Bolt 2 fits flush with gear housing Figure 23 1 Hammer Brace Assembly Mounted on GH40 Soil Probing Hammer Service Manual Rotation Member Page 89 Geoprobe GH 40 Hammer 24 0 INSTALLATION OF HAMMER BRACE ASSEMBLY This section lists the procedure for reinstalling the Hammer Brace Assembly P N 5904 Refer to Figure 23 1 as needed 24 1 Begin this procedure with the hammer member placed on the rotation member within hammer cradle the top mounting bo
9. bench Fig 20 1 Situate the bottom plate or rotation member so that the detent ball indenture is on the left side of the plate Fig 20 2 The indenture should also be on the side of the plate nearest to the technician Position the hammer latch between the bottom plate latch extensions so that the spring hole in the latch corresponds with the indenture in the bottom plate latch extension Fig 20 3 The probe rod groove in the latch should face the work bench Apply asmall amount of Loctite Removable Threadlocker to hammer latch shoulder bolt threads Fig 20 4 Install shoulder bolt on the side of the latch opposite the detent ball indenture Fig 20 5 Screw the bolt in just enough to hold the latch Fig 20 6 The shoulder portion of the bolt should extend only a short distance if at all inside the latch extension Pull the left side of the latch away from the bottom plate extension Fig 20 7 Insert the spring into the latch in hole provided Fig 20 8 Place detent ball against the spring and squeeze it into the latch with a pair of channel lock pliers Fig 20 9 Push the latch towards the bottom plate while continuing to hold detent ball inside of latch Fig 20 10 As the latch is pushed forward the detent ball will slide under the bottom plate latch extension Insert the left side shoulder bolt just far enough to help align the hammer latch indenture with the latch extension Fig 20 11 Once the detent ball is unde
10. e latch extension into the hammer latch Fig 22 12 Tighten both socket head shoulder bolts securely with a 7 16 hex bit and socket wrench Fig 22 13 Hammer latch installation is complete Fig 22 14 Service Manual Rotation Member Page 85 Geoprobe GH 40 Hammer Fig 22 1 Position hammer to the top of its stroke Fig 22 2 Bottom plate latch extensions should correspond with spring cavity in hammer latch Fig 22 3 Apply Loctite Removable Threadlocker to Fig 22 4 Install shoulder bolt on the side of latch hammer latch shoulder bolt opposite detent ball indenture Fig 22 5 Screw bolt in bottom plate just enough to Fig 22 6 Pull left side of latch away from bottom hold latch plate extension Service Manual Rotation Member Page 86 Geoprobe GH 40 Hammer Fig 22 8 Place detent ball against spring and Squeeze into latch Fig 22 9 Push latch towards bottom plate while Fig 22 10 Pivot latch upward until detent ball holding detent ball inside of latch snaps in place Fig 22 11 Apply Loctite Removable Threadlocker Fig 22 12 Install shoulder bolt through the latch on shoulder bolt threads extension into the hammer latch Service Manual Rotation Member Page 87 Geoprobe GH 40 Hammer ora etter LH Fig 22 13 Tighten both socket head shoulder bolts Fig 22 14 Hammer latch installation is complete Service Manual Rotation Member Page 88 Geoprobe GH 40 Hammer 23 0 RE
11. ee of grease Fig 18 10B Hex drive mating surface should be Fig 18 10C Top plate mating surface should be free of grease free of grease Service Manual Rotation Member Geoprobe GH 40 Hammer a m g e a gt eT i 5 aa ef 5 2 ce Pe Fig 18 10D Gear drive box mating surface should Fig 18 11 Install second tapered roller bearing on be free of grease hex drive gear S Fig 18 12 Place gear box shim on bottom plate and align bolt holes Fig 18 14 Place gear box shim on top of Fig 18 15 Align bolt holes and install top plate on gear drive box gear drive box Service Manual Rotation Member Page 72 Geoprobe GH 40 Hammer Fig 18 16 Attach bottom plate gear drive box and top plate Fig 18 17 Install drill steel if necessary to check hex drive gear for proper rotation Fig 18 18 Install grease seal in bottom plate Fig 18 19A Seal is tapped into place using a seal around lower portion of hex drive gear installer Option 1 Service Manual Rotation Member Page 73 Geoprobe GH 40 Hammer Fig 18 19B Seal is tapped into place using a brass Fig 18 20 Reinstall hammer alignment pins in top dowel Option 2 plate if necessary Pa Fig 18 21 Reinstall GH 40 rotation member in hammer cradle Fig 18 22A Reinstall lower mounting bolts Service Manual Rotation Member Page 74 Geoprobe GH 40 Hammer Fig 18 23 Place new 12 tooth sprocket in
12. g rod puller support bracket If the bolt will not slide out easily loosen the two hammer base plate bolts and wiggle the top of the hammer to help free the bolt 25 5 Remove the two top plate bolts with a 3 4 wrench or socket Now lift off the rod puller block 25 6 Removal of the Rod Grip Puller Assembly is complete Top Mounting Bolt Rod Puller Support Brackets Base Plate Bolt 2 Top Plate Bolt 2 Rod Puller Block Socket Head Cap Screw 2 Figure 25 1 Rod Grip Puller Assembly Mounted on GH40 Soil Probing Hammer Service Manual Rotation Member Page 91 Geoprobe GH 40 Hammer 26 0 INSTALLATION OF ROD GRIP PULLER ASSEMBLY This section lists the procedure for reinstalling a Rod Grip Puller Assembly P N GH 1250K GH 2150K or GH 3000K on the GH 40 Soil Probing Hammer Refer to Figure 3 as needed 26 1 Begin this procedure with the hammer member placed on the rotation member within hammer cradle the top mounting bolt removed the two top plate bolts and lock washers removed and the two base plate bolts and lock washers loosely installed 26 2 Place the rod puller block on the front of the hammer Loosely install two 1 2 x 7 bolts 1 2 split lock washers and 1 2 flat washers 26 3 Install the 5 8 x 7 bolt through the support brackets and top hammer mount Position each bracket so that the end with the angled corners will be attached to the rod puller block The side with the longer angle should face toward t
13. hammer NOTE Yellow 020 shims are available but are rarely used because thinner shims allow for more incremental adjustments 18 22 Once the hex drive is properly installed insert a grease seal in the bottom plate around the lower portion of the hex drive gear Fig 18 18 Carefully slide the seal over the hex drive stem until it evenly contacts the bottom plate 18 23 Tap the seal into place using a hammer and a seal installer Fig 18 19A or a brass dowel Fig 18 19B 18 24 Insert a grease seal in the top plate and install in the same manner as the bottom plate 18 25 If the hammer alignment pins were removed during disassembly reinstall them in the top plate with a hammer Fig 18 20 18 26 Install drive chain See Section 16 0 Drive Chain and 12 Tooth Sprocket Installation disregarding Steps 16 8 through 16 10 CAUTION Hammer member and rotation member are heavy Assistance is required to handle them safely Do not attempt to lift them by yourself 18 27 With assistance place the GH 40 rotation member in the hammer cradle Fig 18 21 and reattach it with the four mounting bolts lock washers and flat washers originally used Figs 18 22A B 18 28 Place a new 12 tooth sprocket in the gear drive below the hydraulic motor shaft slot Fig 18 23 Service Manual Rotation Member Page 68 Geoprobe GH 40 Hammer 18 29 Install hydraulic motor See Section 14 0 Hydraulic Motor Installation disregarding Steps 14 13 and 1
14. hat servicing of the GH 40 hammer be performed by a skilled technician with a thorough mechanical background If you re still having problems after reviewing the trouble shooting list please call us at 1 800 436 7762 SITUATION PROBLEM SOLUTION Hammer rotation does not work Hammer has no percussion Oil leaking from vents at the front or rear of the base plate Oil leaking excessively from ham mer anvil area Oil leaking down side of hammer rotation valve Oil leaking from hydraulic hoses Oil accumulates on drill steel on new rotation member or around hammer anvil Oil leaking from top vent on up per hammer member Low pitched noise is coming from near control panel Hex drive has lateral or vertical movement Hex drive has movement in the rotational plane Service Manual Trouble Shooting Control lever is in wrong position Drive chain is broken If valve spool was recently repaired check for proper valve spool installation Bearings are locked up Hammer rotation member needs repairs Control lever is in wrong position Insufficient nitrogen charge If hammer was recently serviced recheck hydraulic hoses for correct connections Hammer piston is seized Base plate seals are leaking Base plate seals are leaking O rings are leaking Fittings may be loose or damaged Excessive grease was used on bearings unit is new or bearings and seals have just been replaced Upper
15. he carrier vehicle Place the 5 8 split lock washer and hex nut on the bolt but do not tighten at this time 26 4 Tighten both hammer base plate bolts 26 5 Thread a 7 8 x 1 1 4 socket head cap screw through the lower end of each bracket and into the rod puller block Move the rod puller block as needed to align the holes Do not fully tighten the cap screws 26 6 Refer to Figure 2 Securely tighten the assembly in the following sequence Top plate bolts top mounting bolt and then socket head cap screws 26 7 Periodically check the tightness of all fasteners for the first few hours of operation Hex Nut 26 8 Installation of the Ro amp amp Gtip Puller Assembly is complete Hex Nut Fi os 5 8 in Split Lock Washer 5 8 in Rod Puller Support Bracket DS Socket Head Cap Screw 7 8 in x 1 1 4 in Bolt DN a Bolt 1 2 in x 1 1 4 in 5 8 in x 7 in Split Lock Washer T 1 2 in N Poon Flat Washer Rod Puller Support Bracket Socket Head Cap Screw G 7 8 in x 1 1 4 in Rod Puller Block Figure 26 1 Components of Rod Grip Pull Assembly Service Manual Rotation Member Page 92 Geoprobe GH 40 Hammer 27 0 TROUBLE SHOOTING Geoprobe Technical Service Representatives recommend that you contact the Geoprobe factory regarding any questions or problems you may have with the GH 40 Hammer We have assembled some solutions to some typical situations that may assist you with repairs Remember we recommend t
16. lt removed and the two base plate bolts and lock washers loosely installed 24 2 Hold each brace in place to ensure proper bolt hole alignment Note that a right and left brace are used They are not interchangeable The right brace is angled on the lower end to fit flush with the gear box 24 3 Insert the 5 8 x 7 bolt through the braces and top hammer mount Loosely attach the 5 8 lock washer and hex nut 24 4 Install the two 1 2 x 1 1 4 bolts and 1 2 lock washers in the lower brace holes Do not tighten the bolts at this time 24 5 Tighten the assembly in the following sequence Base plate bolts lower brace bolts and then the top mounting bolt 24 6 Installation of the Hammer Brace Assembly is complete Service Manual Rotation Member Page 90 Geoprobe GH 40 Hammer 25 0 REMOVAL OF ROD GRIP PULLER ASSEMBLY This section lists the procedure for removing a Rod Grip Puller Assembly P N GH 1250K GH 2150K or GH 3000K from the GH 40 Soil Probing Hammer Refer to Figure 25 1 as needed 25 1 Unfold the probe assembly and position the hammer at a comfortable working height about waist level 25 2 Remove the two socket head cap screws from the rod puller block using a 3 4 or 19 mm Allen wrench or hex bit socket 25 3 Remove the nut and lock washer from the top mounting bolt with a 15 16 wrench or socket and take off the left rod puller support bracket 25 4 Slide the top mounting bolt out of the hammer cradle and take off the remainin
17. ocket head shoulder bolts are installed with Loctite Removable Threadlocker and require significant effort to remove Remove both socket head shoulder bolts Fig 21 3 CAUTION The detent ball and spring installed in the hammer latch as a latch stop are under high spring 21 6 21 7 21 8 compression Latch removal without precaution may result in injury if the detent ball becomes airborne Place a shop towel over detent ball location before removing shoulder bolts Place a shop towel over entire left side of hammer latch detent ball location and pull latch away from bottom plate Fig 21 4 Locate detent ball and spring and place in a container to prevent loss Fig 21 5 Hammer latch removal is complete Service Manual Rotation Member Page 83 Geoprobe GH 40 Hammer le Fig 21 4 Pull hammer latch away from bottom plate Fig 21 5 Locate ball bearing and spring and set aside Service Manual Rotation Member Page 84 Geoprobe GH 40 Hammer 22 0 HAMMER LATCH INSTALLATION NOTE The following instructions for the hammer latch installation can be completed while the hammer remains installed on the probe unit IMPORTANT Always wear safety glasses while removing hammer latch 22 1 22 2 22 3 22 4 22 9 22 6 22s 22 8 22 9 22 10 22 11 22 12 22 13 22 14 22 15 Unit should be fully extended from the vehicle and in the same position as when the hammer latch was rem
18. ottom grease seals from top and bottom plates Fig 17 19 Remove hammer alignment pins from top plate Service Manual Rotation Member Page 65 Geoprobe GH 40 Hammer Fig 17 20 Use a dowel pin or punch to remove Fig 17 21 Use a chisel to remove bearing race from bearing race from top plate bottom plate Service Manual Rotation Member Page 66 Geoprobe GH 40 Hammer 18 0 HEX DRIVE GEAR BEARINGS AND SEALS INSTALLATION NOTE Nearly all internal parts in this section are pictured free of grease Normally the tapered roller 18 1 bearings mentioned in this section would be packed with wheel bearing grease prior to assembly Prior to assembly all parts should be thoroughly cleaned with solvent and dried with compressed air IMPORTANT Wear safety glasses during all hammering procedures 18 2 18 3 18 4 18 5 18 6 18 7 18 8 18 9 18 10 18 11 18 12 18 13 18 14 Place bottom plate on a clean solid surface preferably on an anvil or piece of flat steel Install bearing race into the bottom plate with a brass hammer or hammer and brass dowel Fig 18 1 Work around the race in a criss cross pattern hammering the race into place in small increments Fully seat the race against the shoulder in the bottom plate Fig 18 2 A complete seat is indicated by a ringing sound Visually the top of the tapered edge of the race will stop just short of being flush with the mating surface of the plate
19. oved Hammer should be raised to the top of its stroke Fig 22 1 Position the hammer latch between the bottom plate latch extensions so that the spring cavity in the latch corresponds with the indenture in the bottom plate latch extension Fig 22 2 The probe rod groove in the latch should face the front of the vehicle Apply asmall amount of Loctite Removable Threadlocker to the threads of one hammer latch shoulder bolt Fig 22 3 Install shoulder bolt on the side of the latch opposite the detent ball indenture Fig 22 4 Screw the bolt in just enough to hold the latch Fig 22 5 The shoulder portion of the bolt should extend only a short distance if at all inside the latch extension Pull the left side of the latch away from the bottom plate extension Fig 22 6 Insert the spring into the latch in hole provided Fig 22 7 Place the detent ball against the spring and squeeze it into the latch with a pair of channel lock pliers Fig 22 8 Pivot the latch towards the bottom plate while continuing to hold detent ball inside of latch Fig 22 9 As the latch is pushed forward the detent ball will slide under the bottom plate latch extension Once the detent ball is under the bottom plate latch extension align it with the indenture in the latch extension Fig 22 10 Place a small amount of Loctite Removable Threadlocker on remaining shoulder bolt s threads Fig 22 A Install the left side shoulder bolt through th
20. r bolt threads extension Service Manual Rotation Member Page 81 Geoprobe GH 40 Hammer Fig 20 13 Install shoulder bolt through the latch Fig 20 14 Tighten both socket head shoulder bolts extension into the hammer latch Service Manual Rotation Member Page 82 Geoprobe GH 40 Hammer 21 0 HAMMER LATCH REMOVAL Hammer latch failure during probing operations may require the removal of the latch while the hammer is installed on the probing machine NOTE The following instructions for the hammer latch removal can be completed while the hammer remains installed on the probe unit IMPORTANT Wear safety glasses while removing hammer latch NOTE The hammer latch is equipped with a spring and detent ball assembly which serves as a latch 21 1 21 2 21 3 21 4 21 5 stop in the rotated position The spring and detent ball are located inside the hammer latch and apply pressure to and engage the indenture in the hammer latch extension on the bottom plate of the rotation member When the hammer is installed on the probe unit the detent ball and its indenture are located on the left side of the unit opposite side of the hammer from the control panel Extend unit fully from vehicle Lift hammer to the top of its stroke with the Probe Control Lever Fig 21 1 Turn off deactivate hydraulics system and vehicle engine Loosen both socket head shoulder bolts with a 7 16 hex bit and socket wrench Fig 21 2 The s
21. r the bottom plate latch extension pivot the latch upwards and listen for the detent ball to click into place Remove the left side shoulder bolt and place a small amount of Loctite Removable Threadlocker on the threads Fig 20 12 Install the shoulder bolt through the latch extension into the hammer latch Fig 20 13 Tighten both socket head shoulder bolts securely with a 7 16 hex bit and socket wrench Fig 20 14 Hammer latch installation is complete Service Manual Rotation Member Page 79 Geoprobe GH 40 Hammer Fig 20 1 Place hammer latch and hammer rotation Fig 20 2 Situate bottom plate so detent ball member on work bench indenture is located on left side of bottom plate Fig 20 3 Position spring hole in latch to align with Fig 20 4 Apply Loctite Removable Threadlocker to indenture in bottom plate latch extension hammer latch shoulder bolt Fig 20 5 Install shoulder bolt in bottom plate Fig 20 6 Screw bolt in just enough to hold the latch Service Manual Rotation Member Page 80 Geoprobe GH 40 Hammer Fig 20 7 Pull left side of latch away from bottom plate extension Fig 20 9 Place detent ball against spring and Fig 20 10 Push latch towards bottom plate while Squeeze into latch holding detent ball inside of latch Fig 20 11 Insert left side shoulder bolt just far Fig 20 12 Apply Loctite Removable Threadlocker enough to align hammer latch indenture with latch on shoulde
22. s Fig 19 2 CAUTION The detent ball and spring installed in the hammer latch as a latch stop are under high spring compression Latch removal without precaution may result in injury if the detent ball becomes airborne Place a shop towel over detent ball location before removing shoulder bolts Always wear safety glasses while removing detent ball and spring 19 4 Place atowel around the entire left side of the hammer latch detent ball location and pull latch away from the bottom plate Fig 19 3 19 5 Locate detent ball and spring and place in a container to prevent loss Fig 19 4 19 6 Hammer latch removal is complete Fig 19 5 Service Manual Rotation Member Page 77 Geoprobe GH 40 Hammer Fig 19 1 Loosen shoulder bolts and latch assembly from bottom plate Fig 19 3 Pull hammer latch away from bottom Fig 19 4 Locate detent ball and spring and set plate aside Fig 19 5 Hammer latch removal is complete Service Manual Rotation Member Page 78 Geoprobe GH 40 Hammer 20 0 HAMMER LATCH INSTALLATION NOTE The following instructions for the hammer latch installation occur with the hammer member and rotary member removed from the probe unit IMPORTANT Always wear safety glasses while removing hammer latch 20 1 20 2 20 3 20 4 20 5 20 6 20 7 20 8 20 9 20 10 20 11 20 12 20 13 20 14 20 15 20 16 Place hammer latch and hammer rotation member on work
23. s on the left side of the plate nearest to and facing the technician Fig 18 8 Ifthe hammer latch was not removed the hammer latch slot will face downward toward the workbench Mating surfaces of the bottom plate Fig 18 9A and the drive gear box should be free of grease Fig 18 9B Prior to installing the next bearing ensure that no grease is on either the inner bearing race mating surface Fig 18 10A or the hex drive mating surface Fig 18 10B Make sure that the mating surfaces on the top plate Fig 18 10C and the gear drive box are free of grease Fig 18 10D Install the second tapered roller bearing on the hex drive gear Fig 18 11 The bearing taper should face up and the bearing inner race should seat completely against the shoulder of the hex drive gear Service Manual Rotation Member Page 67 Geoprobe GH 40 Hammer 18 15 Place a new gear box shim on the bottom plate so that the bolt holes align correctly Fig 18 12 Shims are available in 005 010 and 020 thicknesses Replacement shims should be of the same thickness as those removed during disassembly 18 16 Lower the gear drive box onto the bottom plate and shim with the chain cover plate portion of the gear drive box to the right Fig 18 13 Make sure the shim seats correctly and does not wrinkle Double check bolt hole alignment as the gear drive box is lowered onto the bottom plate 18 17 Place original shim or one of the same thickness on the top of the
24. stem Hydraulic fluid cooler may be dirty Vehicle cooling fan may not be operating properly Hammer latch may need lubrication Hammer anvil retainer cap may need lubrica tion Detent ball groove in hex drive has been deformed from excessive pulling See Section 4 0 and use a large punch and hammer to drive anvil out of rotation member Install hammer anvil See Section 7 0 or see Section 4 0 and send to factory Use compressed air or a pressure washer to remove any debris from cooler fins Check vehicle cooling fan for proper operation Lubricate shoulder bolts and steel detent ball with silicone or graphite lubricant If lubrication fails See Section 19 0 for removal Lubricate steel retainer balls in anvil retainer cap with silicone or graphite lubricant WD 40 may be necessary See Section 17 0 to replace hex drive If you do not wish to make any repairs to the GH 40 hammer yourself please call a service representative and request a Return Authorization Number to send your GH 40 hammer or any component to the factory This will expedite your return and assist with service Geoprobe personnel are here to help whenever possible with whatever problem you may have Our telephone number is 1 800 GEOPROBE 1 800 436 7762 Service Manual Trouble Shooting Page 94 Geoprobe GH 40 Hammer 24 0 REFERENCES Geoprobe Systems August 1993 1993 94 Equipment and Tools Catalog Geoprobe Systems
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