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TECHNICAL MANUAL

1. mm NE NDS FIGURE 18 67 1 07 SERVICE PROCEDURES DISASSEMBLY Seal and Bearings 1 07 2 l Refer to figure 19 Inspect inner shaft seal 1 for nicks cuts scratches and proper shape A seal in good condi tion will be flat and properly seated in its groove A blown shaft seal will be cone shaped not flat as shown due to excessive motor case pressure If shaft seal replacement is necessary continue with step 10 if NOT continue with step 13 on page 66 NOTE Even though inner shaft seal may appear to be in good condition it would be good preventive maintenance to replace it The motor may have experienced extended high operating temperature and or repeated motor case pressure surges that could weaken the seal by fatigue with no noticeable effect on appearance FIGURE 19 MORMAL SHAFT SEAL 68 1 07 SERVICE PROCEDURES DISASSEMBLY Seals and Bearings 1 07 2 J Refer to figure 20 Using a screwdriver carefully pry out inner shaft seal 1 taking care NOT to scratch or nick bearing races 2 Shaft seal must be destroyed in order to remove it FIGURE 20 NOTE To install new inner shaft seal the outer race of the inner roller bearing MUST first be removed K Refer to figure 21 With inner shaft seal removed carefully remove inner bearing race 1 using a suitable internal bearing puller or by using a soft metal punch FIGURE 21 69 1 07 SERVICE PROCEDURES DISASSEMBLY
2. INSTALLATION OF CAM RING O RING SEALS A Refer to figure 49 Apply a small amount of petroleum jelly or grease at several locations in o ring groove of bearing support housing 1 Install new o ring seal into groove as shown Lightly coat exposed surface of o ring with clean hydraulic oil to promote proper sealing Apply a small amount of petroleum jelly or grease at several locations in o ring groove of distribution over 2 Install new o ring seal 3 into groove and lightly coat o ring with clean hydraulic oil FIGURE 49 83 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY INSTALLATION OF CYLINDER BLOCK AND CAM RING A Refer to figures 50 and 51 Check condition of cylinder block 1 Inspect piston rollers 2 and distributor mating surface 3 for nicks and scratches Inspect splines 4 on cylinder block 1 and on wheel shaft for extreme wear or chips replace parts as necessary Install cylinder block onto wheel shaft splines with distribution holes 5 facing up Cylinder block should easily slide into place If any binding occurs remove block and check for proper alignment or for nicks on wheel shaft or cylinder block splines Refer to figures 52 and 53 Check condition of cam ring 1 Inspect for nicks and scratches replace if necessary Care fully place cam ring on top of bearing support housing 2 and align holes Coat entire top surface of cylinder block 3 with hydraulic o
3. CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI REVERSE LINE CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI SYSTEM PRESSURE 1000 TO 6000 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI TEST PROCEDURE NO 2 PILOT PRESSURE TO ENGAGE CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI PROBLEM CAUSE RWD NOT FUNCTIONING SOLENOID VALVE NOT WORKING PILOT PRESSURE TO DISENGAGE CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CASE DRAIN PRESSURE 0 TO 30 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI Turn ignition switch to the ON position Do NOT start engine Have an assistant operate the ON OFF RWD switch A distinct click should be heard at the solenoid indicating that the solenoid valve spool is shifting properly If click is not heard check for possible loose wire connections at the screw terminal of the solenoid valve and or at the RWD switch in the cab Also check for improper grounding of solenoid valve The solenoid valve is internally grounded through the Equa Trac Il valve Grounding can be tested by using a jumper wir
4. Seal and Bearings NOTE Check overall condition of OUTER bearing If replacement is necessary remove outer race with suitable internal bearing puller or drive out with a soft metal punch L Refer to figure 22 Wash all parts in clean solvent and thoroughly dry using compressed air Wrap parts and keep them in a clean area prior to reassembly FIGURE 22 PARTS WASHER N M Refer to figure 23 Inspect outer grease seal and deflector under outer bearing on wheel shaft for any signs of damage If grease seal and or deflector replacement is necessary continue with step 1 on page 71 If replacement is NOT necessary continue with step 1 on page 75 or step 1 on page 78 if shaft seal is NOT being replaced FIGURE 23 OUTER BEARING GREASE SEAL DEFLECTOR 1 07 SERVICE PROCEDURES DISASSEMBLY Seals and Bearings 1 07 2 Outer Bearing Grease Seal and Deflector Removal A Refer to figures 24 and 25 aclean work bench pull inner race and rollers of outer bearing 1 from wheel shaft with the use of a bearing separator extractor as shown NOTE Lip of bearing separator MUST be positioned under deflector 1 as shown in figure 25 In this operation the deflector 1 and outer grease seal 2 are destroyed Clean bearing and wheel shaft Inspect for abnormal wear or damage from bearing separator FIGURE 24 BEARING SEPARATOR FIGURE 25 T1 1 07 SERVICE PROCEDURES REASSEMBLY Outer Bearing Grease S
5. Relief Manifold 55 Block f E 2 BS Manifold Adapter gt Block Hydrostatic Drive Wheel Motor REVERSE HIGH PRESSURE CHARGE PRESSURE MUD HOG WHEEL y ALES CASE DRAIN RETURN DRIVE SYSTEM SYSTEMONREVERSE 5 ADJUSTMENTS AND MAINTENANCE The following points should be reviewed in order to reduce down time by regular observation and mainte nance A CHECKING AND ADJUSTING REAR WHEEL TOE IN The rear wheels should be adjusted to have 1 4 to 3 8 toe in to the front closer together in the front than in the rear Measure toe in from the center of one tire to the center of the other tire preferably at the height of the wheel center and the same height from the ground in the front and in the rear 17 SYSTEM OPERATION ADJUSTMENTS AND MAINTENANCE continued FRONT 14 34 NARROWER THAN REAR Toe in adjustment if necessary Place rear wheels in a straight ahead position Remove bolts spac ers clamp halves and locknuts from both ends of the tie rod tube Loosen both tie rod jam nuts Turn the adjustable inner tubes as necessary to align a set of holes in the unbolted ends of the tie rod tube NOTE Attempt to maintain equal amounts of exposed threads on both tie rod ends TIE ROD END INNER ADJUSTABLE TIE ROD TUBE NUT BOLT amp SPACER MEL m ES SEE OE ro Me tet EXAMPLE ONLY After toe in is adjusted to proper specification reinstall bolts soacers clamp halves and lock nuts
6. being lubricated If the wobble switch was not installed and the MUD HOGoperating switch was ON while the picker heads were being lubricated it is possible for the MUD HOGRWD to develop enough torque to move the machine This potentially dangerous situation can be prevented by the use of the wobble switch Wobble Stick The wobble switch operates as a normally open switch that is engaged closed whenever the transmission shift lever is moved into gear and the ON OFF MUD HOGRWD switch is turned ON The switch then allows electrical current to be supplied to the Equa Trac II E T II valve solenoid to operate the MUD HOG system When the transmission is in neutral the wobble switch is opened thus preventing the MUD HOGfrom operating SPINDLE QREASING VALVE 9950 ONLY WOBBLE STICK JOHN DEERE oda SWITCH amp BRACKET STA For John Deere cotton picker applications the MUD HOG can be engaged three gears In Case International picker applications the MUD HOG s engaged in 1st and 2nd gears only the wobble switch prevents operation of the MUD HOGRWD in 3rd gear due to the design characteristics of the switch activation system and shift lever position in 3rd gear 9 SYSTEM OPERATION 2 ELECTRICAL COMPONENTS AND CONTROLS continued Displacement Control Valve For Two Speed Applications For MUD HOG axles equipped with two speed motors a displacement control valve DCV is used to shift the wh
7. Install 7500 psi or greater pressure gauges in both forward and reverse test ports Install 500 psi or greater gauges in both pilot pressure ports Engage and Disengage CAUTION d SS Use care when removing plugs so that A Internal parts of valve are not lost A PILOT PRESSURE TO DISENGAGE c PILOT PRESSURE TO ENGAGE B FORWARD SYSTEM PRESSURE REVERSE SYSTEM PRESSURE With RWD ON record pressure readings with machine moving in forward and then reverse Sluggish poor performance of machine may be caused when charge pressure drops below 100 psi when this happens system pressure is not allowed to increase high enough to keep the machine moving Refer to figure 1 page 32 for correct range of test pressures The probable cause of the charge pressure decreasing below 100 psi is excessive case leakage within the hydrostatic system This excessive leakage may be caused by either the RWD system or hydrostatic trans mission of the machine The following specifications will determine if the problem is within the RWD system Leakage from the wheel motors should not exceed 1 5 gallons per minute gpm with the machine moving at system pressure the E T Il valve leakage should not exceed 1 0 If excessive leakage exists refer to section E of this manual for wheel motor service instructions If leakage is within specification then compo nents within the hydrostatic transmission of the machine may hav
8. VALVE OPERATION FUNCTION OF INTERNAL COMPONENTS The major components within the Equa Trac II valve consist of Selector spool Flow divider spools eCheck valves In the front half inlet port side of the E T II valve the selector spool controls the path of oil in the charge and high system pressure circuits to the rear portion of the valve which houses flow divider spools and check valves CHECK VALVES FLOW DIVIDER SPOOLS p YIN AS CHECK VALVES 22 Ac CP I4 ut n x cl d y SIS RS Cal AAA E FLOW NN lt lt FLOW DIVIDER SPOOLS CURRENT PRODUCTION UNTIL LATE 1989 EARLY 1990 When the solenoid coil is energized oil flow from the main fixed displacement motor enters the E T II valve through the forward or reverse inlet port depending on operation mode and is directed by the selector spool to the forward or reverse flow divider spool The flow of oil is equally split through a divider spool and is directed through the forward or reverse check valves to the wheel motors The flow divider spool is spring loaded to center from each end It has two equally sized fixed orifices in the center When the rear drive wheel traction is equal the pressure drop on both sides of the flow divider spool is the same and the spool is located at dead center If one of the drive wheels begins to slip the pressure drop on that side of the flow divider spool becomes greater than the pressure drop on the oppos
9. los MS11 motors is reached As bearing is being pressing into place be sure that grease seal is positioned properly to avoid being crushed by bearing i Bil uuu NE 1 t L 1 l l I Ium 5 A FIGURE 29 E Refer to figure 30 Relieve pressure and remove pressing tools If necessary apply more grease to rollers along bearing If inner shaft seal is NOT being replaced proceed with step 1 on page 78 otherwise proceed with step 1 on page 75 FIGURE 30 BEARING GREASE 74 1 07 SERVICE PROCEDURES SEALS AND BEARINGS REASSEMBLY Inner shaft seal Installation A Refer to figure 31 Apply grease to outer edge of a new inner shaft seal 1 before installation FIGURE 31 75 1 07 SERVICE PROCEDURES SEALS AND BEARINGS REASSEMBLY INNER SHAFT SEAL INSTALLATION B Refer to figure 32 Place inner shaft seal 1 into bore of bearing support housing 2 as shown with spring side of seal facing up FIGURE 32 SPRING Refer to figure 33 Tap in new shaft using a properly sized steel tube 1 until seal seats in bore Tool number 1 can also be used to install shaft seal FIGURE 33 TOOL 1 76 HIGH PRESSURE SEAL INSTALLATION BEARING SUPPORT COMPONENTS SHOWN FOR REFERENCE 0 6 TEM PART DESCRIPTION O RING INNER SEAL FLANGE 090 10
10. 07 3 DISASSEMBLY REMOVAL OF PISTON ASSEMBLIES Your cylinder block will contain one of two different kinds of piston retainers It will either have roll pins and retainers as shown in Figure 63 or it will have clips and lunambules as shown in figure 63B on page 93 Follow the directions for your type of retainers for removal and installation of piston assem blies ROLL PIN AND RETAINER REMOVAL A Refer to figure 63 Support cylinder block assembly 1 on two blocks of wood with distributor mating surface 2 face up Tap out each roll pin 3 using a punch and hammer Remove piston roller retainers 4 FIGURE 63 c erm 5 NECI CA SN TO REMOVE ONE PISTON FOUR RETAINERS MUST BE REMOVED 91 1 07 3 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 DISASSEMBLY REMOVAL OF PISTON ASSEMBLIES B Refer to figure 64 Using aLIGHT application of compressed air CAREFULLY extract each piston 1 and roller 2 being careful NOT to scratch distributor mating surface 3 of cylinder block 4 with air nozzle 5 Catch pistons in hand covered with shop cloth CAUTION Pistons may eject from cylinder bore with considerable force unless a LIGHT application of compressed air is used FIGURE 64 PISTON ROLLER ASSEMBLY C Refer to figure 65 Clean and inspect condition of pistons rollers and cylinders bores 1 for any signs of seizure or abnormal wear If serious wear is found repla
11. DISASSEMBLY ASSEMBLY COMBINES continued ASSEMBLY CONTINUED Refer to illustrated parts breakdown on page 40 I Reconnect tie rod and steering cylinder end if necessary to wheel motor mounting frame ear or bracket Use new cotter pins Torque mounting nuts to proper specifications J Reinstall wheel motor onto mounting frame Refer to page 106 of this manual Install mounting bolts using locktite 271 permanent type or equivalent Torque bolts to proper specification K Reconnect hydraulic tubes to wheel motor tube fittings Refer to page 106 L Ifnecessary pump more grease into upper and lower grease fittings on mounting frame M Reinstall wheel and tire assembly and torque lug nuts to proper specifications N Perform start up procedure found on page 35 of this manual 3 WHEEL DRIVE DISASSEMBYL ASSEMBLY COTTON PICKERS DISASSEMBLY Refer to illustrated parts breakdown on page 42 A Raise and support rear of machine using hydraulic jack and support stands Remove wheel and tire assembly B Disconnect tie rod and steering cylinder end if necessary from wheel motor mounting frame ear or tie rod end mounting ear C Support bottom of wheel motor mounting frame using shop crane and lifting sling or chain around wheel drive D Loosen and remove 7 8 bolt 7 8 hardened washer and retaining cap securing tie rod end mounting ear bracket to stub axle assembly Remove tie rod mounting ear E Carefully lower wheel
12. One Piston D DISCHARGE POSITION Refer to figure 4 As the piston 1 starts to climb the next cam lobe 2 ports passages 3 in the distributor 4 and cylinder block 5 begin to align with each other thus starting the discharge cycle This allows the hydraulic oil under charge pressure to return to the pump as another piston takes over to continue the drive cycle FIGURE 4 52 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Path of One Piston E TOP NEUTRAL POSITION Refer to figure 5 During the final cycle of the piston 1 the piston continues to climb another cam lobe 2 As this happens ports 3 in the distributor 4 and cylinder block 5 progressively close off return oil flow as the piston and roller reaches the top neutral position When the roller is at the top of the cam lobe the ports are no longer in alignment thus ending a full drive cycle The piston and its roller will then repeat the cycle starting with a gradual supply of high pressure oil while other pistons continue their cycles in a similar manner FIGURE 5 5 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Drive System Engaged F WHEEL MOTOR POWER DISTRIBUTION Engaged The typical System 48 or 57 CID wheel motor contains ten pistons and eight cam lobes therefore a total of 80 power strokes are produced by
13. Ze WW AN HOLON 33H M OL 1HOd 3HNSS3Sud WALSAS 5394 W31SAS dSH3A3H HO1OMW 133HM 01 3unssadud WALSAS 5 JOVON3 OL v 3unSS3Hd LOlld LA 1801 JOU JO 18029101 yu snid Buj owes uet SATVA n 1 NOILNVO 34 START UP PROCEDURE FOR REAR WHEEL DRIVE SYSTEM After having completed the installation or servicing of the rear wheel drive system on a hydrostatic drive machine the following start up procedure must be performed to insure adequate bleeding and flushing of the newly installed or serviced hydraulic components This procedure also serves to check proper plumbing of the hydrau lic circuit ITIS IMPORTANT THAT THESE INSTRUCTIONS BE CARRIED OUT AS SPECIFIED Any alteration of this procedure will defeat its purpose which is to bleed air out of the system and flush any possible contamination from the closed loop Special attention must be given to the 1 2 inch limited movement of the hydrostatic control lever as it is critical not to allow excessive oil flow during this procedure If any time while performing this procedure a malfunction occurs that causes the hydrostatic system to be reopened such as disconnecting a hose or fitting itis necessary to begin the procedure again at STEP 1 STEPS 1 7 ofthis procedure are performed with the front drive wheels of the machine on the ground and chocked securely and the MUD HOG RWD
14. a sealed cavity The inboard bearing is lubricated by hydraulic oil in the motor case therefore no maintenance is required for either bearing Periodically check for oil leaks With machine shut off check for evidence of external oil leakage around seals housings fittings or hose connections Check for pinched hoses to wheel motors that could restrict oil flow and cause oil to overheat Check tightness of wheel motor mounting bolts in addition to fittings and tube hose connections 110
15. machined into washers are most likely worn down closing off passages for grease to enter the inside diameter of the bushings Thrust washers must be replaced See page 39 for wheel drive disassembly COTTON PICKERS Refer to figure 2 on page 37 and figure 5 on page 42 Disconnect tie rod end from tie rod mounting ear of wheel drive Support bottom of wheel motor mounting frame using shop crane and lifting sling or chain around wheel drive Remove 7 8 bolt 7 8 hardened washer and retaining cap from tie rod mounting ear on wheel drive Remove tie rod ear Carefully lower wheel motor and frame assembly from stub axle end housing containing bushings Wipe out grease from inside diameter of bushings Check for excessive or uneven wear on in side diameters of bushings Also check for excessive wear on king pin Remove hardened steel washer and slotted thrust washer Check condition of thrust washer grease slots and thickness of the thrust washer itself Proper thickness should be 190 about 3 16 If above checks reveal excessive wear of busings and or thrust washer replacement of those parts is necessary See pages 39 through 43 for wheel drive disassembly procedure 38 WHEEL DRIVE MAINTENANCE CONTINUED 2 WHEEL DRIVE DISASSEMBLY ASSEMBLY COMBINES DISASSEMBLY Refer to illustrated parts breakdown on page 40 A Raise and support rear of machine using hydraulic jack and support stands B Remove wh
16. motor mounting frame from stub axle end housing containing bushings Remove hardened steel washer and slotted thrust washer Check mounting frame for cracks F Remove bushings from axle end housing by carefully driving them out using a soft metal drift or mandrel Check axle end housing for cracks SEE WHEEL DRIVE ASSEMBLY PROCEDURE ON PAGE 43 41 A18NWJSSV ATIHN3SSVSIO 3AIHG 133HA S 3Hn5l4 N31SAS a31dWAvx3 ae Nid ONIN LNNOW IH3HA SNIHSAG HOLY INANDOV HOLON 133 E 6 EGOtOl H3HSY AA LSNHHL t H 1 1 uvas JIL s H3HSVM 1331 4 91 DNIOY4 51075 uno43 T1Y d 880001 SNIHSNS H3MO01 T1v1S dh Z HO b A10 618 0L AIA 3uYnOS c NACO SLOTS 880 01 5 TIYISNI 4 DNINIYL3H 42 WHEEL DRIVE MAINTENANCE CONTINUED WHEEL DRIVE DISASSEMBLY ASSEMBLY COTTON PICKERS continued ASSEMBLY Refer to illustrated parts breakdown on page 42 A Drive new king pin bushings into stub axle end housing as shown in illustrated parts break down using an appropriately sized mandrel NOTE Itis very important for the bushings to be installed correctly in order for grease to be properly distributed Apply high quality bearing grease around inside diameter of bushings B Grease and position new hardened s
17. motors with ten 5 8 mounting bolts or 300 350 ft lbs for MS11 motors with eight 7 8 mounting bolts Also check tightness of hydraulic tubes at wheel motors Torque the 3 4 wheel drive mounting bolts to 300 320 ft Ibs See figure 3 below FIGURE 3 2 222 NOTE Wheel drive assemblies should always be cleaned regularly Any leaks which may occur can be easily found with clean wheel drives 37 WHEEL DRIVE MAINTENANCE CONTINUED BASIC MAINTENANCE REQUIREMENTS EVERY 1500 HOURS OF MACHINE OPERATION Perform a wear check on the wheel drive bushings and thrust washers COMBINES Refer to figure 1 on page 36 and figure 4 on page 40 A B Remove retaining snap ring from top of wheel motor frame Carefully pry out dust cap expansion plug NOTE If cap is damaged from removal anew cap will need to be installed Wipe out grease from top of bushing Check for excessive or uneven wear on inside diameter of bushing Repeat procedure a b c and d forlower bushing If one or both bushings show signs of excessive wear it is recommended that they be replaced during a complete disassembly ofthe wheel drive If excessive wear is not present fill cavities with grease and reinstall dust caps and snap rings Check for obvious visible wear of thrust washers shown in figure 1 on page 36 Measure thickness of thrust washers original manufactured thickness is 190 about 3 16 If wear amounts to an 1 8 or more grease slots
18. of One Piston B FULL SUPPLY POSITION Refer to figure 2 As the piston and roller 1 makes its way toward the bottom valley of the cam lobe 2 the MAXIMUM full supply of high pressure hydraulic oil momentarily is directed through the aligned ports 3 of the distributor 4 remaining stationary and cylinder block 5 rotating with continuation on to the piston 1 The oil supply then begins to taper off as the piston approaches the bottom of the cam lobe 2 toward a neutral no drive power position FIGURE 2 CAM MHG CAM RING Q 50 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Path of One Piston C BOTTOM NEUTRAL POSITION Refer to figure 3 When the piston 1 is at the bottom of the cam lobe 2 the oil supply is cut off The ports 3 in the distributor 4 and cylinder block 5 are NOT in alignment with each other In this neutral position the piston does NOT provide drive power to the cylinder block however the piston and roller remains in contact with the cam surface In order to continue driving power another piston must take over for the first one to drive the cylinder block in the direction shown enabling the first piston to climb the next cam lobe in a smooth and uninterrupted manner FIGURE 3 CAM MHG CAM RING 51 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Path of
19. tend to adhere to cylinder block 2 because of oil film between mating surfaces To insure that distributor remains seated in cover lift cover on one side only to bread adhesion between distributor and cylinder block ALTERNATE METHOD CAREFULLY insert thin piece of wood under location tab 3 of distributor and pry up to break adhesion CAUTION Inserting wood too far may scratch mating surfaces of distributors and or cylinder block 63 1 07 SERVICE PROCEDURES DISASSEMBLY SHAFT GREASE SEALS AND BEARINGS 1 07 2 DISTRIBUTION COVER FIGURE 12 C Refer to figure 13 Remove cam ring 1 and discard large o ring seals in distribution cover and bearing support housing grooves D Carefully remove cylinder block from the splined wheel shaft by lifting straight up If necessary apply leverage under block on opposite sides at the same time Figure 13 FIGURE 13 CYLINDER BLOCK O RING SEAL 64 1 07 SERVICE PROCEDURES DISASSEMBLY Shaft Grease Seals and Bearings 1 07 2 E Refer to figure 14 Position bearing support housing and wheel shaft assembly 1 in a hydraulic press capable of applying 30 000 or more pounds of pressing force Place steel arbor plates 2 between wheel studs to support shaft so that press force is NOT applied directly on to wheel studs FIGURE 14 Pee ae JN Qu HYDRAULIC PRESS F Refer to figures 15 and 16 Remove snap ring retainer 1 NOT included in later
20. 5907 SHAFTWHEELHUB HIGH PRESSURE SEAL COMPONENTS 76A 1 07 SERVICE PROCEDURES SEALS AND BEARINGS REASSEMBLY Bearing Race Installations A Refer to figure 34 Place inner bearing race 1 into bore of bearing support housing 2 NOTE Check to make sure that bearing race is placed correctly in bore BEFORE driving in race TOOL 4 FIGURE 34 22227 FIGURE 35 B Refer to figure 35 Use appropriate end to tool number 4 to press or drive in bearing race until it is properly seated in bore NOTE Use care when driving or pressing in bearing race to prevent damage to race C Refer to figure 36 If outer race of outer bearing 1 is being replaced turn bearing support housing 2 over and use other end of tool number 4 to press or drive in bearing race until it is properly seated TOOL 4 FIGURE 36 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY Installation of Bearing Support Housing and Related Parts A Refer to figure 37 Check to make sure that outer bearing race in bearing support housing 1 is clean and free of any signs of dirt Apply grease on inner edge of shaft seal 2 and outer edge of grease seal 3 before installing bearing support housing onto shaft seal NOTE Apply tape or cardboard around shaft splines to prevent damage to shaft seal as bearing support housing is lowered onto wheel shaft CAREFULLY lower housing 1 down onto wheel shaft 4 NOTE Be su
21. 69 and 70 Carefully lift distribution cover from cam ring NOTE If cover is lifted straight up distributor 1 will tend to adhere to cylinder block 2 because of oil film between meeting surfaces Lift cover on one side only to break adhesion ALTERNATE METHOD CAREFULLY insert thin piece of wood under location tab 3 of distributor and pry up to break adhesion CAUTION Inserting wood too far may scratch mating surfaces of distributor and or cylinder block Discard large o ring seal in distribution cover 96 1 07 SERVICE PROCEDURES DISTRIBUTOR AND DISTRIBUTION SEALS 1 07 4 DISASSEMBLY FIGURE 69 F E FIGURE 70 DISTRIBUTOR D Refer to figure 71 Loosen distributor 1 in distribution cover 2 using open end wrench es to pry up on each side of the distributor NOT at location tabs 3 Turn distribution cover horizontal while holding distributor then CAREFULLY remove distributor to avoid losing springs 4 FIGURE 71 97 1 07 SERVICE PROCEDURES DISTRIBUTOR AND DISTRIBUTION SEALS 1 07 4 DISASSEMBLY E Refer to figure 72 Using an o ring pick or other sharp tool remove and discard three o ring and back up seals 1 from distribution cover 2 making sure not to scratch or nick seal grooves 3 FIGURE 72 INSPECTION F Refer to figure 73 Clean and inspect condition of distributor 1 and distributor cavity 2 within distribution cover 3 Check for any signs of seizure or abnormal wear
22. 9 SYSTEM TROUBLESHOOTING PROBLEM POSSIBLE CAUSE REMEDY Refer to MUD HOG Installation Operation Manual for proper hose routing 3 One wheel on RWD is dragging A Incorrectly mounted high pressure or locked up hoses on hydraulic wheel motors With the MUD HOG system OFF no Forward or Reverse system pressure and with the tire off the ground rotate tire by hand if the tire will not rotate then the wheel motor is locked up Service or replace wheel motor See Section E of this manual 4 RWD is not functioning A Blown fuse Replace fuse ON OFF switch shorted out Replace switch Disconnected or broken electrical Reconnect or replace with 16 gauge wire wire B Hydraulic wheel motor is locked up due to internal component failure D Solenoid valve in E T II valve not working due to 1 Solenoid valve spool not shifting 2 Coil inside solenoid See test procedure No 2 page 32 valve shorted out 3 Loose wire connection s 4 Improper grounding E Main spool in E T II valve not shifting F Excessive motor leakage See test procedure 2 page 32 G Low hydrostatic fluid level NOTES 30 SECTION TEST PROCEDURE NO 1 PROBLEM CAUSE RWDSLUGGISH EXCESSIVE LEAKAGE OR INADEQUATE CHARGE PRESSURE First make sure that the outside of the Equa Trac II E T II valve is free from any dirt or grease Dirt must NOT be allowed to enter the valve when removing any of the valve components
23. E Information in this manualis proprietary property of Tuthill Transport Technologies GENERAL INFORMATION This technical manual is intended for use by dealer service manabers salesmen and shop mechanics to provide detailed information on components operation characteristics and servicing of HOG System II III or IV rear wheel drive The information will be helpful for becoming acquainted with the system and its components Section of this manual covers system operation It features the use of pictorial circuit diagrams showing what occours when the MUD HOG system 1s turned on and off Section B features useful information with detailed illustrations describing the function of the internal components within the Equa Trac II valve which is common to all MUD HOG kits Section C outlines problems and causes that can typically occur with the MUD HOG system and corrective actions with test procedures to perform in solving those problems Section D provides information on wheel drive maintenance including procedures to disassemble and reassemble the steerable wheel drive unit for replacement of worn components Illustrated exploded parts breakdowns are provided for wheel drive units Section E contains information describing the operation of the wheel motor and step by step disassembly assembly procedures for servicing the wheel motor Special tools required for these procedures are listed and illustrated For addi
24. ENGAGE 01 C PILOT PRESSURE TO ENGAGE B FORWARD SYSTEM PRESSURE D REVERSE SYSTEM PRESSURE Record pressures with machine moving and with RWD ON and then with RWD OFF Refer to figure 1 page 32 for correct range of test pressures If pilot pressure readings are NOT correct then check solenoid valve to be sure that the valve is shifting properly see test procedure No 2 If pilot pressure readings are correct but forward and reverse line pressures to the wheel motors NOT correct then the main spool in the E T II valve is not shifting Remove large hex plug from pilot pressure to disengage port Disconnect steel tube at the tee fitting on the opposite side of the removed plug Remove large hex plug and fitting assembly Check for free movement of the spool in its bore If spool does not move freely remove spool from bore and check for excessive wear on the spool and its bore Reinstall spool in bore and check again for free movement back and forth If spool continues to stick then replace the complete E T 11 valve assembly Pilot pressure tube 33 TIVLSN I 3unssdud HOS SNOILVIOT AlddNS JUNSSJHd 10 1ld JAIVA OION3 IOS JHOd 3H SS3Hd WALSAS QHVMHOJ Sy 35VON3SIO OL NOISSINSNVHL WOUS amp Q 3unSS3Hd WALSAS Nie P ps IW urn we NC 131NI 87 vp 9 NOISSINSNVYHI WOHJ BAGS oS 1 J4NSSJHd WALSAS S Lie 137NI 3SH3A3H
25. NGASSEMBLY SJ 1 TW INNER SHAFT SEAL i R 3 OUTERBEARINGASSEMBI Y E HP J 2n i BEARING SUPPORT HOUSING a GREASE SEAL 1 P DEFLECTOR WHEEL SHAFT m QTY 8 OR 10 WHEEL SHAFT SHAFT SPLINE SNAP RING RETAINER SNAP RING SHIM PACK SHIM SUPPORT WASHER SNAP RINGSPACER BEARING RACE 62 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 07 SERVICE PROCEDURES DISASSEMBLY Shaft Grease Seals and Bearings 1 07 2 NOTE Replacement of the inner shaft seal and or outer grease seal requires replacement of large o ring seals Replacement of the bearings requires replacement of the inner shaft seal outer grease seal the deflector and adjustment of the bearings Replacement of the adjusting shims may be re quired in the above listed situations A Refer to figure 11 and to component illustration of page 62 Remove 14 or 10 of 16 or 12 total socket head bolts 1 securing distribution cover 2 to cam ring 3 and bearing support housing 4 using 10 millimeter mm hex key and or hex driver Leave two opposite bolts partially engaged turn motor horizontal and break open to drain oil Set motor into tank of a parts washer with wheel studs down Remove remaining bolts Clean motor components as they are removed FIGURE 11 B Refer to figure 12 Carefully lift distribution cover from cam ring NOTE If cover is lifted straight up distributor 1 will
26. Patent No 4 766 727 and by numerous foreign patents GENERAL INFORMATION PRINCIPLE OF OPERATION The Equa Trac II E T II valve is typically mounted off the rear drive axle of the machine between the wheel motor drives The E T Il is a spool type valve controlled by a 12 volt electric solenoid cartridge valve An ON OFF switch in the operator s cab activates the electric solenoid valve This movement of the spool opens up internal passages within the valve to permit high system pressure oil to flow to the wheel motors The oil flow is equally split between the wheel motors by passing through a forward or reverse flow divider spool within the valve When the E T II valve solenoid is not activated oil flow through the valve is bypassed internally in a recirculating loop 21 PICTORIAL COMPONENT IDENTIFICATION TAT WS SECTION B EQUA TRAC Il VALVE OPERATION Solenoid cartridge valve w plunger Cover Plate Solenoid Coil Solenoid coil housing Solenoid cartridge valve assembly Selector spool Spring low pressure shuttle Check ball low pressure shuttle Dowel pin low pressure shuttle Spring spacer low pressure shuttle Plug Orificed plug 22 xz cdomxovozez Adapter Pilot pressure tube Tee Steel cap Flow divider spring Check valve ball seat Check ball Check valve spring Flow divider spool standard design oplit flow divider spool rev design 90 degree elbow Machined valve body EQUA TRAC
27. Replace parts if serious wear is found FIGURE 73 98 1 07 SERVICE PROCEDURES DISTRIBUTOR AND DISTRIBUTION SEALS 1 07 4 REASSEMBLY DISTRIBUTION SEALS A Refer to figure 74 Apply a light amount of grease or petroleum jelly to distributor seal grooves 1 in distribution cover 2 First install o ring seals 3 into grooves 1 then CAREFULLY install matching back up composite seals 4 into grooves NOTE Attempt to keep deformation of back up seals to a minimum Apply grease or petroleum jelly over seals and inner surfaces of distributor cavity FIGURE 74 DISTRIBUTOR B Refer to figure 75 Check to make sure that all springs 1 used in distributor 2 are all equal in height and are NOT damaged Place springs in recesses after first applying grease to springs to hold them in place for distributor reinstallation FIGURE 75 99 1 07 SERVICE PROCEDURES DISTRIBUTOR AND DISTRIBUTION SEALS 1 07 4 REASSEMBLY DISTRIBUTOR C D Referto figure 76 Apply a light coat of grease or petroleum jelly to seal bearing surfaces of distributor 1 Turn distribution cover 2 over on its side and CAREFULLY install distributor into cavity with location tabs 3 resting in tab ears 4 NOTE Make sure that springs do NOT fall out of distributor Seat distributor into cavity by HAND ONLY and ensure that location tabs are correctly seated in tab ears NOTE For 2 speed wheel motors there are
28. TECHNICAL MANUAL MUD HOG System ll System lll And System IV Powered Wheel Drive Systems Patent No 4 140 196 COVERING SYSTEM OPERATION EQUA TRAC VALVE OPERATION SYSTEM TROUBLESHOOTING amp TESTING WHEEL DRIVE MAINTENANCE WHEEL MOTOR OPERATION amp SERVICE PROCEDURES MO Fr T U T H 9098 West 800 South P O Box 600 Brookston Indiana USA 47923 Drive Systems Tel 219 279 2801 Fax 219 279 2390 www mudhog com Toll Free 1 800 348 2474 104385 3 09 TECHNICAL MANUAL MUD HOG System II System Ill and System IV Rear Wheel Drive Table of Contents Page No General Information 4 Safety Procedures 5 SECTION A SYSTEM OPERATION 1 Performance 6 2 Electrical Components and Controls 7 3 Hydrostatic Circuitry Description 11 4 Operational Circuit Diagrams 15 9 Adjustments and Maintenance 17 SECTION B EQUA TRACII VALVE OPERATION 15 General Information Principle of Operation 21 2 Pictorial Component Identification 22 9 Function of Internal Components 23 4 Operation Descriptions 26 SECTION C SYSTEM TROUBLESHOOTING AND TESTING 1 System Troubleshooting 29 2 Testing Procedures 31 3 Start Up Procedure 35 SECTION D WHEELDRIVE MAINTENANCE ju Basic Maintenance Requirements 36 2 Wheel Drive Disassembly Assembly Combines 39 3 Wheel Drive Disassembly Assembly Cotton Pickers 41 SECTION E WHEELMOTOR OPERATION AND SERVICE PROCEDURES Table of Contents for Section E 44 NOT
29. arge pressure hose Passages in the cartridge are opened or closed by the movement of the plunger When the solenoid coil is energized charge pressure oil is directed through the open passages in the cartridge to one end of the selector spool The charge pressure oil moves the spool toward an engaged or ON position to operate the MUD HOG System When the solenoid valve coil is deenergized the charge pressure oil moves the spool toward a disengaged or OFF position There is only one wire to the solenoid valve it is routed from the ON OFF switch in the cab and back to the solenoid The wire is tie strapped in several places to prevent abrasion from rubbing which could cause a short and blow the fuse The wire is connected to the solenoid valve by means of a ring terminal and nut WIRE TO ON OFF SWITCH EQUA TRAC Il VALVE TIE STRAP _ 05 Pe 0 EOR RING TERMINAL amp NUT A quick check can be performed to be sure that wires are properly connected Turn the ignition switch ON do not start engine Have an assistant turn the ON OFF switch in the cab ON you should hear a distinct click indicating the solenoid is working properly 8 SYSTEM OPERATION 2 ELECTRICAL COMPONENTS AND CONTROLS continued A Wobble Switch for Cotton Picker Applications The primary reason why the wobble switch is used in cotton picker applications is to prevent engagement of the MUD HOGRWD system while the picker heads and related components
30. axle raised and secured such that the rear wheels remain off the ground with sufficient clearance around the machine At all times maintain proper fluid level in the hydrostatic reservoir GEAR MUD HOG HYDRO TEP TIME MMENT EN 1 2 SPEED NEUTRAL NEUTRAL 3 MIN BLEED AIR ENTIRE SYSTEM 1 2 INCH FLUSH FORWARD MAIN HIGH IDLE NEUTRAL FORWARD 2 MIN SYSTEM 1 2 INCH FLUSH REVERSE MAIN HIGH IDLE NEUTRAL REVERSE 2 MIN SYSTEM CHECK CORRECT ROTATION HIGH IDLE NEUTRAL ON rot OF MUD HOG SEE NOTE 5 If wheel s rotate reverse go to STEP 6 On Case 2555 Cotton Pickers lockout switch must B If no rotation go to STEP 5 DO NOT repeat check valve be activated to allow E T 11 Valve to be on This can C If wrong rotation correct forward reverse circuit to to STEP 1 be done by pushing the wire from the lockout switch D If 2 speed motors activate displacement control switch check toward 1st and 2nd gear for change of speed of MUD HOG tires E DU Lec gg MAXIMUM SEE NOTE ME Md e pem AM EM o eee 1 2 3 4 1 2 SPEED HIGH GEAR 1 4 INCH 15 SEC FORWARD PRESSURE CHECK HOLD BRAKES FORWARD MAXIMUM FOR LEAKS 1 2 SPEED HIGH GEAR 1 4 INCH 15 SEC REVERSE PRESSURE CHECK HOLD BRAKES REVERSE MAXIMUM FOR LEAKS Case Rice Combines with System and Case 2555 Cotton Pickers place gear selector in 2nd gear as MUD HOG will not activate in 3rd 35 SECTION D WHEEL DRIVE MAINTENANCE The wheel mo
31. case drain return oil flows from the wheel motors and E T Il valve and back to the cooler and reservoir System On Off Switch aa Hydrostatic System Reservoir Main Hydrostatic System Motor Split System HydrostaticDrive 7 Wheel Motor High Pressure LA Relief S Manifold Block EN Manifold Adapter Nus Pd Block Hydrostatic Drive Wheel Motor FORWARD HIGH PRESSURE CHARGE PRESSURE CASE DRAIN RETURN MUD HOGWHEEL DRIVE SYSTEM SYSTEM ON FORWARD SYSTEM OPERATION 4 OPERATIONAL CIRCUIT DIAGRAMS continued C MUD HOG SYSTEM ON REVERSE Oil flow in the reverse system ON diagram is similar to the oil flow in the forward mode except that the flow of oil in the high pressure lines flows in the opposite direction High system pressure is delivered from the reverse side of the hydrostatic system motor to the reverse inlet port of the E T II valve The oil then flows through the reverse flow divider spool in the valve and is equally split between the wheel motors Oil flow returns from the forward inlet ports of the wheel motors at charge pressure and passes through the forward side of the E T II valve and back to the fixed displacement motor Motor case drain return oil flows from the motors and valve back to the cooler and reservoir System On Off Switch S Hydrostatic System Reservoir Main Hydrostatic System Motor Split System us d HydrostaticDrive Wheel Motor High Pressure gt
32. ce cylinder block assembly including pistons and rollers FIGURE 65 92 1 07 3 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 DISASSEMBLY CLIP AND LUNAMBULE REMOVAL A Refer to figure 63B Carefully pry clips out of groove on cylinder block If clip is bent during removal it must be replaced Using a LIGHT application of compressed air CAREFULLY extract each piston and lunambule assembly ROLLER LUNAMBULE CLIP a CYLINDERBLOCK Figure 63B 93 1 07 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 REASSEMBLY INSTALLATION OF PISTON ASSEMBLIES NOTE Either of two classes of pistons may have been installed originally A class 1 piston 0 1 mm oversized is rare and is marked with a 1 on the piston head and its corresponding cylinder bore Class 0 zero pistons and cylinder bores are standard and are NOT marked Make sure that proper repair kit is ordered when servicing piston assemblies See page 91 for repair kit descriptions and kit part numbers for ordering purposes A Refer to figure 66 Coat new piston assembly 1 and cylinder bore 2 with hydraulic oil Install each piston assembly into its bore by squeezing piston rings 3 with fingers while pushing piston assembly into bore NOTE Pistons should move freely in cylinder block bores If movement feels rough examine pistons and bores for scoring or contamination If scoring is excessive repla
33. ce if necessary Reinstall in the order shown Reinstall coverplate being CAREFUL not to crimp o ring under the cover plate SNAP RING SPRING e 9 WASHER SPOOL O RING DISTRIBUTORHOUSING FIGURE 82A 105 1 08 MOTOR INSTALLATION ONTO MACHINE REMOUNTING 1 08 1 A Refer to figure 83 Attach wheel motor 1 to a suitable lifting device such as a shop crane 2 CAREFULLY move wheel motor close to mounting frame 3 Have a helper assist in positioning wheel motor on mounting frame CAUTION The wheel motor is very heavy 127 lbs 508 amp ME08 185 Ibs MS11 Use extreme care when removing and handling motor to prevent personal injury and damage to wheel motor fittings Align holes and reinstall machinery bushings and mounting bolts Apply Loctite No 271 or equivalent to bolts Remove lifting device Torque bolts to 180 210 ft lbs 300 350 ft lbs MS11 motors FIGURE 83 106 1 08 MOTOR INSTALLATION ONTO MACHINE REMOUNTING 1 08 1 B Refer to figure 84 Remove plugs from high pressure tubes 1 with hoses already connected to tubes and caps from wheel motor fittings 2 Reconnect tube nuts to wheel motor fittings but do not tighten Reposition tube clamp halves 3 on top of wheel motor mounting frame Secure clamps and tubes to mounting frame using clamp plate 4 bolts 5 and lockwashers 6 Torque clamp bolts to 18 25 ft los and tube nuts at fittings to 35 40 ft Ibs C Refer to figur
34. ce records with the and add the correct amount and type machine to determine if the recom of hydraulic oil if necessary mended service procedures have been made at the proper intervals Check for previous reports of unusual frequent or 3 Checkthe quality of the oil change if similar failures milky dirty or discolored Also smell the oil A burned odor indicates excessive heat that can destroy the lubricating qualities of the oil Again the oil should be changed if this condition is found Determine the cause of the excessive heat and correct it TROUBLESHOOTING PROBLEM POSSIBLE CAUSE REMEDY System is more effective in higher gear Refer to System Operation section of this manual 1 Performance of RWD is A Operating with transmission sluggish poor gearing too low Refer to MUD Installation Operation Manual for correct plumbing procedure C Weak high pressure relief Refer to machine service manual 2 for proper setting B Incorrectly plumbed main high pressure lines For amp Rev Excessive case leakage from MUD HOG system See test procedure No 1 page 1 From wheel motor s 31 2 From E T Il valve E Inadequate charge pressure See test procedure No 1 page 31 2 RWD operates in Forward but A Excessive Case Leakage not in Reverse OR operates in B Electrical circuit malfunction See test procedure No 1 page Reverse but not in Forward C Stuck spool in E T Il valve 31 2
35. ce with new complete cylinder block assembly includes piston assemblies ROLL PINAND RETAINERINSTALLATION Refer to figure 67 Reinstall piston roller retainers 1 into grooves 2 of cylinder block 3 Align holes in guide segments with roll pin holes 4 in cylinder block Using a punch and hammer tap in new roll pins 5 into cylinder block to secure retainers NOTE Roll pins should be tapped in BELOW the cylinder block surface an equal amount on both sides CLIP AND _LUNAMBULE INSTALLATION Slide lunambules onto pistons Insert clips into grooves on lunambules and cylinder block as shown in Figure 63B on page 93 Refer to section 1 07 2 INSTALLATION OF CYLINDER BLOCK AND CAM RING starting on page 84 and section 1 08 1 on page 106 for final wheel motor reassembly and reinstallation onto machine FIGURE 66 95 1 07 SERVICE PROCEDURES DISTRIBUTOR VALVE BLOCK AND DISTRIBUTION SEALS 1 07 4 A Remove wheel motor from machine refer to section 1 06 B Refer to figure 68 and to illustrations on pages 61 and 62 Remove 14 of 16 total 10 of 12 total MS11 motor socket head bolts 1 securing distribution 2 to cam ring 3 and bearing support housing 4 using 10 mm or larger hex key or hex driver Leave two opposite bolts partially engaged turn motor horizontal and break open to drain oil Set motor onto tank of parts washer with wheel studs down Remove remaining bolts C Refer to figures
36. cessary continue with step 1 on page 81 79 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY Bearing Pre Load Adjustment A Refer to figure 40 and 41 Place snap ring space 1 on top of bearing race 2 Using external snap ring pliers 3 install snap ring 4 into groove on shaft and position snap ring at top of groove ENS M C x Em c Dy N FIGURE 40 FIGURE 21 Refer to figure 42 Place pressing tool number 1 Shown below on top of inner bearing roller race 2 Compress bearings with a pressing force of 22 500 pounds 27 000 Ibs MS11 motor WHILE maintain ing required pressing force on bearings measure and record height of gap between snap ring spacer 3 and snap ring 4 using feeler gage 5 Relieve pressing force and remove tool FIGURE 42 80 1 07 SERVICE PROCEDURES SEALS AND BEARINGS REASSEMBLY Bearing pre load adjustment C Refer to figure 43 Add a value of 006 005 MS11 motor to the recorded gap height measurement Using shim support washer 1 and shims 2 taken from a new shim pack build up correct thickness to obtain new determined measurement by using a 0 1 micrometer This shims can be peeled off as needed to reduce shim pack to required thickness NOTE If measure gap plus 4 006 005 is LESS than thickness of shim support washer alone rotate bearing support housing to help seat b
37. e 85 Reconnect case drain hose 1 and motor case flushing system supply hose 2 if equipped to their original connection fittings Tighten hose ends securely Reinstall wheel tire assembly and torque lug nuts to proper specification D Proceed to Start up Procedure found on page 109 FIGURE 84 FIGURE 85 C ria Turn wheel motor drives from stop to stop Check that hoses do NOT kink twist or bind Make any necessary adjustments to clamps or fittings 107 1 08 MOTOR INSTALLATION ONTO MACHINE HOSE CONNECTIONS AT WHEEL DRIVES BIGHT HAND WHEEL DRIVE FORWARD HI PRESSURE TORQUE TO 35 40 11 108 lt AS TORQUE TO 35 40 ft lbs PRESS B jill ES w L4 A REVERSE HI PRESSURE Ta a 53 Tes CASE DRAIN TORQUE TO 35 40 ft lba 222 a CORDURA SLEEVE FIGURE 86 LEFT HAND WHEEL DRIVE REVERSE HI PRESSURE FORWARD HI PRESSURE NOTE On MUD HOG kits with 2 speed motors the right hand motor s forward and reverse ports are opposite the normal position i e forward is to the rear and reverse is to the front The left hand motor is as shown in Figure 87 NOTE If forward and reverse system pressure hoses are switched when reinstalled motor will turn in the wrong direction 108 START UP PROCEDURE 1 08 2 The following start up procedure must be performed to insure adequate bleeding and flushing of the newly in
38. e are organized in logical sequence to properly disassemble a wheel motor This is NOT the ONLY sequence that can be used however certain components must be removed in the sequence indicated Before starting a disassembly procedures make sure that the work area is clean and safe A clean work area will reduce the chance of foreign matter entering the hydraulic system as hydraulic lines are disconnected Make sure proper tools are available and are in good working order Label tag or mark parts as they are removed Refer to the exploded parts illustration of the wheel motor This will help identify parts that can be involved in a failure and will simplify the assembly procedure Avoid as much dirt as possible DURING disassembly The accumulation of additional dirt will make it more difficult to clean the parts REASSEMBLY This procedure assumes that all of the components have been cleaned inspected and replaced if necessary and are ready to be installed Torque values for bolts are specified as needed NOTE Many of the critical parts included in the Tuthill Drive Systems wheel motor are of special design to accommodate the loads and operating requirements of the drive system application on combines and cotton pickers Make sure any replacement parts are obtained from Tuthill Drive Systems to insure mechanical integrity and proper operation NOTES 46 WHEEL MOTOR IDENTIFICATION The following will aid you in identifying whic
39. e connected to the terminal nut the solenoid and to the frame of the machine If solenoid operates properly using the jumper wire examine the solenoid wire for any signs of breakage replace if necessary Check area under heads of bolts securing E T Il valve to bracket make sure there is a bare metal surface no paint or grease to ensure proper grounding If click is still not heard perform an electrical resistance check on the solenoid valve coil to determine if the coil is defective Coil resistance should be 7 9 ohms If the solenoid valve still does not shift after checking for secure wire connections and acceptable coil resistance replacement of the solenoid valve is necessary The solenoid valve is not serviceable thus it must be replaced Coil Resistance 7 9 ohms us a SECTION TEST PROCEDURE NO 3 PROBLEM CAUSE RWD NOT FUNCTIONING MAIN SPOOL NOT SHIFTING First make sure that the outside of the E T II valve is free from any dirt or grease Dirt must NOT be allowed to enter the valve when removing any of the valve components Install 7500 psi or greater pressure gauges in both forward and reverse test ports and forward and reverse lines between the E T Il valve and wheel motors Install 500 psi or greater pressure gauges in both pilot pressure ports Engage and Disengage 7 CAUTION Use care when removing plugs so that Internal parts of valve are not lost f Die A PILOT PRESSURE TO DIS
40. e excessive leakage refer to service manual for the machine NOTE For MUD HOG systems equipped with motor case flushing lines refer to page 10 of this manual the following procedure must be used to perform the leakage test 1 Disconnect and plug motor case flushing hose where it connects to tube fitting at wheel motor Cap the tube fitting 2 Disconnect case drain hose at the E T II valve then place end of hose into a suitable container 3 Allow oil to escape into the container while operating the machine with the MUD HOG turned on IMPORTANT ALWAYSKEEP IN MIND CLEANLINESS AND SAFETY 31 SECTION TESTING PROCEDURES FIGURE 1 TEST PRESSURES VS MACHINE OPERATION MODE TEST LOCATIONS OPERATION MODE MUD HOG ON FORWARD MUD HOG ON NEUTRAL MUD HOG ON REVERSE MUD HOG OFF FORWARD MUD HOG OFF NEUTRAL MUD HOG OFF REVERSE FORWARD PORT SYSTEM PRESSURE 1000 TO 6000 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI SYSTEM PRESSURE 1000 TO 6000 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI REVERSE PORT CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI SYSTEM PRESSURE 1000 TO 6000PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI SYSTEM PRESSURE 1000 TO 6000 PS FORWARD LINE SYSTEM PRESSURE 1000 TO 6000 PSI CHARGE PRESSURE 100 TO 300 PSI CHARGE PRESSURE 100 TO 300 PSI
41. e the forward and reverse pressure inlet cavities they will always be exposed to either system pressure or return charge pressure oil whether in forward or reverse Cavity K opens an oil flow path to the forward pressure ports of the wheel motors after first passing through a flow divider Cavity L similarly opens an oil flow path to the reverse pressure ports of the motors also passing through the flow divider The spring is located at the OFF end of the spool in order to bias the spool to the OFF position in the event of an engine failure or when the machine has to be towed and there is no charge pressure oil flow to move the spool to the OFF position NOTE THE SELECTOR SPOOL PORTION OF THE VALVE CROSS SECTION ILLUSTRATION HAS BEEN SIMPLIFIED 27 EQUA TRAC II VALVE SYSTEM ON ENGAGED OPERATION DESCRIPTIONS CONTINUED SECTION B ERED por D 7 7 NM NM 5 29 AS xn j 241849 ECS When the toggle switch in the cab is in the ON position the coil within the solenoid valve is energized Passages in the solenoid valve cartridge are opened and initially charge pressure oil is delivered to cavity G while oil in cavity E is drained to tank When the spool arrives at its full ON position passage H is open to passage K which provides forward system pressure to the forward pressure inlet ports on the motors Passage L is open to passage J which allows return flow at charge pressure to come from the
42. e to be on This can C If wrong rotation correct forward reverse circuit to to STEP 1 be done by pushing the wire from the lockout switch D If 2 speed motors activate displacement control switch check toward 1st and 2nd gear for change of speed of MUD HOG tires 1 2 INCH CHECK CORRECT ROTATION 5 LOW IDLE E REVERSE mM OF MUD HOG MAXIMUM SEE NOTE HIGH GEAR 1 2 INCH FLUSH FORWARD MUD HOG HIGH IDLE HOLD BRAKES FORWARD 4MIN SYSTEM HIGH GEAR 1 2 INCH FLUSH REVERSE MUD HOG HIGH IDLE ioi 5 BRAKES REVERSE 4MIN SYSTEM 5 HIGH GEAR 1 4 INCH 15SEC FORWARD PRESSURE CHECK HOLD BRAKES FORWARD MAXIMUM FOR LEAKS T een HIGH GEAR 1 4 INCH 15 SEC REVERSE PRESSURE CHECK HOLD BRAKES REVERSE MAXIMUM FOR LEAKS On Case Rice Combines with System and Case 2555 Cotton Pickers place gear selector in 2nd gear as MUD HOG will not activate in 3rd 109 1 09 ROUTINE MAINTENANCE CARE GENERAL RECOMMENDATIONS 1 09 1 For any maintenance procedure be sure to maintain cleanliness of dissembled components In order to prevent hydraulic oil contamination within the wheel motors it is IMPERATIVE that the oil filter elements s for the hydrostatic system of the machine be replaced on a REGULAR schedule as indicated in the machine operation manual NOTE The wheel motors are operated and lubricated by use of the hydraulic system oil from the machine The outboard bearing of each wheel motor is lubricated with grease in
43. eal and Deflector Installation A Refer to figure 26 Position wheel shaft 1 under hydraulic press 2 Use steel arbor plated 3 to support shaft so that press force is NOT applied directly onto wheel studs Place new deflector 4 onto wheel shaft as shown Apply a generous amount of bearing grease around the flat lip on inner surface of deflector FIGURE 26 72 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY B Refer to figure 27 Place new outer grease seal 1 onto deflector 2 with lip of seal 3 against deflector and groove 4 facing up Apply a generous amount of bearing grease to inner groove 4 of grease seal FIGURE 27 Refer to figure 28 Pack or repack outer bearing 1 with high quality bearing grease NOTE Make sure bearing rotates freely without roughness If replacement is necessary replace both bearing and cup Install greased bearing onto wheel shaft 2 with large diameter facing down see figure 28 Place tool number 3 onto top of bearing The tool is designed to apply pressing force to inner race of bearing making sure pressing force is NOT applied to roller cage FIGURE 28 ar 73 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY D Refer to figure 29 Place pressing tool 1 or similar tool onto tool 2 previously installed Proceed to press bearing downward on the wheel shaft until a minimum pressing force of 22 500 pounds 27 000
44. earings Reapply the 22 500 Ib 27 000 Ib MS11 motor pressing force and remeasure gap see Step B page 80 FIGURE 43 INSTALLATION OF SHIMS SNAP RING amp RELATED PARTS A Referto figure 44 Place shim support washer 1 then shims 2 on top of inner bearing race 3 The shim support washer MUST be installed first FIGURE 44 1 07 SERVICE PROCEDURES INSTALLATION OF SHIMS SNAP RING amp RELATED PARTS REASSEMBLY SEALS amp BEARINGS 1 07 2 B Refer to figures 45 46 and 47 Place snap ring spacer 1 on top of shims 2 Using external snap ring pliers 3 install snap ring 4 onto shaft Compress inner bearing with tool number 1 so that snap ring can be easily positioned in groove Push backside of snap ring down into groove by inserting a screwdriver through small notch 5 in tool see figure 46 Push ears 1 of snap ring down into groove until snap ring snaps into place BE SURE THAT ENTIRE SNAP RING MAKES CONTACT WITH BOTTOM OF GROOVE see figure 47 Relieve pressing force and remove pressing tool FIGURE 45 1 07 2 SERVICE PROCEDURES INSTALLATION OF SHIMS SNAP RING amp RELATED PARTS REASSEMBLY Seals and Bearings 1 07 2 F Refer to figure 48 Place snap ring retainer 1 on top of snap ring spacer 2 as shown so that retainer surrounds snap ring If retainer does NOT easily fit around snap ring snap ring is NOT properly seated d we WOT SEF FIGURE 48
45. ectly serviced When raising the rear of the machine make sure that a dependable lift device is used of adequate capacity Use suitable jack stands to support the machine Apply PARK or EMERGENCY BRAKE and block the front wheels to prevent the machine from rolling DANGER Escaping fluid under pressure can have sufficient force to penetrate the skin Causing serious personal injury Fluid escaping from a small hole can be almost invisible Use a piece of cardboard or wood rather than your hands to search for suspected leaks Make sure that the system pressure is relieved BEFORE disconnecting any hoses or steel line connections DO NOT alter axles in ANY manner alteration may reduce the strength resulting in possible damage or personal injury DO NOT alter any component of the MUD HOG system Unauthorized modification may result in possible damage or personal injury DANGER Failure to follow proper procedures when mounting atire on a wheel or rim can produce an explosion which may result in serious bodily injury DO NOT attempt to mount a tire unless you have the proper equipment and experience to perform the job safely WARNING Any damaged high pressure hose should be replaced with a comparable four spiral wire reinforced hose DO NOT usea two or three wire braid hose These types of hoses are NOT designed to withstand the high operating pressures in a hydrostatic system SECTION A MUD HOG SYSTEM OPERATION INTRODUCTION Thi
46. eel motors from full displacement to half displacement A switch mounted in the cab is used to activate the solenoid on the DCV which supplies the motors with charge pressure to shift them The solenoid on the DCV has two wires One wire connects to the switch in the cab and the other wire connects to one of the mounting bolts of the DCV fora ground CONNECT TO SWITCH DISPLACEMENT CONTROL VALVE 10 SYSTEM OPERATION HYDROSTATIC CIRCUITRY DESCRIPTION High Pressure 5500 to 6000 psi All high pressure hoses are four spiral wire reinforced or equivalent rated at 5000 psi working pressure or better High pressure hoses carry hydraulic fluid under high system pressure to provide motor torque High pressure replacement hoses should always be four spiral wire reinforced and of equivalent rating as original hose Replacement hoses can be purchased through a MUD HOGdealer from Fluidrive Inc CAUTION NEVER replace high pressure hoses with two or three wire braid hose These types of hoses are NOT designed to withstand the high operating pressures in a hydrostatic system A Motors to Equa Trac E T Il valve assembly four 1 2 I D hoses Observing from the rear of the machine the front tubes on top of each motor carry high pres sure oil to the motors for forward operation of the machine The rear motor tubes carry high pressure oil to the motors for reverse operation of the machine The forward motor hoses connect to the bottom outlet
47. eel tire assembly Disconnect tie rod and steering cylinder and if necessary from wheel motor mounting frame ear or bracket C Remove set screw from king pin housing D Remove snap rings top and bottom and expansion plugs dust caps top and bottom from wheel motor mounting frame E Have assistant hold wheel motor mounting frame straight to prevent from turning Carefully drive king pin out of its housing from the top while mounting frame is being supported F Remove mounting frame from king pin housing Remove hardened steel washer and grooved thrust washer Clean grease and or dirt from mounting frame G Remove king pin bushings from mounting frame by carefully driving them out using a soft metal punch or mandrel Check mounting frame for cracks H Check condition of king pin for pitting and surface rust polish if necessary ASSEMBLY Refer to illustrated parts breakdown on page 40 A Drive new king pin bushings into wheel motor mounting frame as shown in illustrated parts breakdown using an appropriately sized mandrel NOTE IT IS VERY IMPORTANT for the bushings to be installed correctly in order for grease to be properly distributed Grease and position new hardened steel washer and slotted thrust washer onto bottom spot face of mounting frame as shown in illustrated parts breakdown Use high quality wheel bearing grease Apply grease to inside surfaces of king pin bushings Position mounting frame onto king pin
48. embly 63 2 Reassembly 72 CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 1 Disassembly 88 2 Reassembly 94 DISTRIBUTOR VALVE BLOCK AND DISTRIBUTION SEALS 1 07 4 1 Disassembly 96 2 Reassembly 99 TWO SPEED COMPONENTS 1 07 6 1 Removing and Inspecting 105 60 1 07 1 COMPONENT ILLUSTRATIONS EXPLODED WHEEL MOTOR COMPONENTS SNAP RING RETAINER SNAP RING SNAP RING SPACER BEARINGSUPPORT ASSEMALY SHIM PACK SHIM SUPPORT WASHER INNER BEARING ASSEMBLY INNER SHAFT SEAL E 5 BEARING SUPPORT HOUSING gt PISTON RETAINER REPAIR KIT CONTAINS ROLL PINS amp RETAINERS OR CONTAINS GUIDES amp CLIPS OUTER BEARING ASSEMBLY GREASE SEAL ROLLER DEFLECTOR SEGMENT HEEL STUD PISTON PISTON RING PISTON REPAIR KIT O RING SEALS DISTRIBUTOR SEAL KIT DISTRIBUTOR VALVE BLO SPRING LOCATION TAB COVER PLATE 2 SPEEDCOMPONENTS NOT IN SINGLE SPEED MOTORS SNAP RING 61 1 07 1 COMPONENT ILLUSTRATIONS WHEEL MOTOR CROSS SECTION COVER PLATE BOLT COVER PLATE DVER PLATE O RING SEAL SPRING T tit in aur al DISTRIBUTOR VALVE BLOCK DISTRIBUTOR SEALS PRESSURE PORT QTY 2 BLEED SCREW QTY 2 SOCKET HEAD BOLT CASE DRAIN PORT QTY 12 OR 16 DISTRIBUTOR COVER In i lil LOCATION TAB QTY 2 as CAM RING Je gi CYLINDER BLOCK ROLLER ROLLER SEGMENT PISTONRETAINER PISTON E E f PISTON RING INNERBEARI
49. eservoir 1 Motors to E T II Valve two 1 2 1 0 hoses A case drain hose connects to each wheel motor and to the elbow fittings on the right side of the E T II valve 2 E T Il Valve to Reservoir one 1 2 1 0 hose The drain hose connects to a fitting on the right side of the E T Il valve and directly to a reservoir fitting or to fittings installed in areturn line to the reservoir RESERVOIR Ope Wy V t 2 CASE DRAIN HOSES EXAMPLE ONLY AU RU V 12 SYSTEM OPERATION 3 HYDROSTATIC CIRCUITRY DESCRIPTION CONTINUED D Motor Case Flushing System 5 25 psi On late model MUD HOG System II III and IV combine and cotton picker kits extra lines are added to provide cooled hydraulic oil to the wheel motors This cooled hydraulic oil flushes the motor case to remove damaging high temperature oil The motor case flushing system consists of a line tap between the machines oil cooler and hydraulic oil reservoir This tap consists of a tee and a 15 psi or 20 psi check valve that allows cool oil from the oil cooler to flow to the wheel motors first A 1 2 hydraulic hose is routed from the tap to a bulkhead tee at the E T II Valve Additional 1 2 hoses from the bulkhead tee to each motor deliver cooled hydraulic oil to be distributed throughout the inner cavities of the motors and then exits through case drain lines routed to the reservoir Hydrostatic System Reservoir Direction Hyd
50. fittings on the E T II valve The reverse motor hoses connect to the top outlet fittings on the E T Il valve The E T II valve provides an equal traction effect in both forward and reverse operating modes NOTE In 2 MUD HOG units the right hand wheel motor s forward and reverse ports opposite the normal location The front tube is reverse and the rear tube is forward REVERSE HIGH PRESSURE FORWARD atu HIGH PRESSURE 4 7 72 wA x REAR OF MACHINE FORWARD HIGH PRESSURE REVERSE HIGH PRESSURE EXAMPLE ONLY 11 SYSTEM OPERATION 3 HYDROSTATIC CIRCUITRY DESCRIPTION CONTINUED B E T Il Valve to Main Hydrostatic Transmission two 3 4 I D hoses The integral or back to back transmission has two large 1 1 16 test ports that are convenient to use for high pressure hose connections The machine s service manual clarifies which is the forward and which is the reverse test port Obtaining large enough high pressure ports in split transmissions is accomplished by providing manifold port adapter block s Selecting the wrong high pressure ports at the hydrostatic transmission would cause the rear wheels to have the opposite rotation of the front wheels It is then necessary to switch the hoses at the transmission connections to correct the rotation direction ADAPTER BLOCK Case Drain Return 5 15 psi The case drain lines carry the motor leakage and solenoid valve drain oilbackto the hydro static oil r
51. forward and reverse sides of the hydrostatic circuit ahead of the selector spool The shuttle system provides pilot control pressure oil to passage A at all times even when the MUD HOG is off Passage A feeds to solenoid cartridge valve which directs charge pressure oil to either engage or disengage the selector spool There is always charge pressure on the return side of the hydrostatic circuit for example in the forward operating mode there is system pressure oil in the forward F cavity and charge pressure oil in the reverse R cavity In this situation the system pressure will be higher than the charge pressure System pressure oil will close off check ball B When B closes off check ball C will open up because the spacer between balls B and C will not allow both balls to seat at the same time When check ball C opens this allows charge pressure oil to flow from the return reverse side of the circuit past check ball C past the spacer and into passage A SECTION MSS SCRE Nes any ENLARGED VIEW rad 22 TA ED d C CLES SOLENOID CARTRIDGE VALVE CAVITY d A er ET ado t ao The solenoid cartridge valve is a 4 way valve that takes the charge pressure oil and directs it to one end of the selector spool or the other If there is charge pressure oil supplied to one end of the spool the opposite end will drain through the so
52. g the spool may stay centered and the full oil flow from the hydrostatic pump may travel to the wheel motors SPLIT FLOW DIVIDER SPOOL 72 SSN Ss E Vis Ae wy WY A 24 SECTION B FUNCTION OF INTERNAL COMPONENTS continued CHECK VALVES The basic function of the check valve is to prevent the full amount of return oil at charge pressure from the wheel motors from flowing back through the valve and flow divider orifice s This oil flow situation would develop a large pressure drop The check valves will allow some of the return oil flow from wheel motors to pass through the check valves themselves and the remaining flow to pass through the flow divider orifice s to reduce the amount of pressure drop in the return circuit A check valve consists of a check ball seat spring and 9 16 inch diameter check ball As the return oil flow increases the check ball is moved off of its seat to allow some of the flow to pass through the check valve There are four check valves in the E T II valve CHECK BALL SEAT CHECK BALL VALVE SPRING n a 1 x 777 A IN Jen geo pp 17 eG GZ m RASS VALVE CROSS SECTION 25 EQUA TRAC II VALVE OPERATION OPERATION DESCRIPTIONS LOW PRESSURE SHUTTLE SYSTEM CONTROL PRESSURE SUPPLY The low pressure shuttle system of the Equa Trac II E T II valve is simply a combination of two check valves between the
53. h wheel motor you have The wheel motors are all similar in size and shape with the following differences The MS11 motor is larger than the others and has 10 wheel mounting studs The 508 08 and MS16 motors have 8 studs The MS16 motor cam ring is wider than the 508 or MEO8 as shown in the following table The only way to tell the difference between MS08 and ME08 motors is to look at the identifi cation tag mounted on the valve housing portion of the motor The motor may be single speed or two speed refer to page 61 for identification of the two speed components WHEEL FLUIDRIVE MOTOR CU IN CAM RING MOTOR EM DISPLACEMENT sr ps WIDTH IN 22 57 POCLAIN HYDRAULICS HYDRAULICS MS11 2 124 411 1230 5A MR 2 124 A11 12350 5A M CODE 5243790W INDICE SERIES 055 19541 IDENTIFICATION TAG ON WHEEL MOTOR CAM RING WIDTH IDENTIFICATION TAG LOCATION 47 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 02 WHEEL MOTOR IDENTIFICATION A WHEEL MOTOR DISPLACEMENT SIZE IDENTIFICATION Combine Cotton Picker ee 4 Mounting Bolt 10 508 ME08 MS16 7 Wheel Stud 10 MS11 8 MS08 ME08 MS16 08 MS11 MS16 WHEEL MOTORS ARE NOT STAMPED WHEEL MOTOR HUB FACE STAMPED WITH S 47 6 Cubic Inch Displacement CID Motor MS08 Only or P 57 12 CID Motor MS08 Onl B WHEEL MOTOR DRIVE SYSTEM SERIAL NUMBER STAMPED On early model MUD HOGS Typical Se
54. housing and have assistant hold in place Grease king pin and position into top king pin bushing with set screw hole aligned so it will match hole in king pin housing CAREFULLY drive knig pin into king pin housing until set screw hold in pin aligns with hole in king pin housing Apply non permanent locktite to set screw and install into king pin housing Check movement of wheel motor mounting frame Frame should pivot smoothly Install new expansion plugs and snap rings 39 69 01 H3HSVM 713315 Q3N3QHVH OU9 0 Hf ONIS OH Nid 9NDI Al8W3SSV A18W3SSVSIG 3AIHG Al IN3LSAS pue Ill NALSAS II IN3 L 8AS NMOHS GNVH ATNO 31d NVX4 Pen H3HSVM LSNYHL YOLOW 1T33HM NL HOL VINWNDOV M YOLOW 133HM 8562014 95 145 c 0LLU68 LAN WVf ONIHSfI8 AYANIHOVIN ONILLIS 3SV3H9 1108 QV3HX3H t LXEL 8 G m AX S 989601 4 uA 5 Nid 9NDI 0L ALO 1108 QV3H X3H 1 LXLL 8 S NN p G 9 0L4 Nid 9NIM Z ALO IN OIf 80XIN 8HO 21 40 IN OIf 80XIN 0 ZXZZIN H3 Ld VQ V IN OIf SOXIN GHO 80 10 IN OIf 80XIN S LX9 LIN H3 Ld VOV LHDIY A18 N3SSV 38n L 6680 L8 9fYIdNOISNVdX3 69 0 L4 di AV 10 9 1 v69 0L 31V ld dV 1o 38n L 5 SLSEOL sR ONIY d VNS 5NINIV L3H H3HSVM2019I S LNOHJ LHDIY ATSINSSSV 38n L 1109 GV3H 8 H5 ONN ZX9L G 40 WHEEL DRIVE MAINTENANCE CONTINUED 2 WHEEL DRIVE
55. il FIGURE 52 FIGURE 53 84 1 07 SERVICE PROCEDURES SEALS AND BEARINGS REASSEMBLY INSTALLATION OF DISTRIBUTION COVER A Refer to figures 54 and 55 Inspect cylinder block mating surface 1 of distributor 2 mounted in distribution cover 3 Check for nicks or scratches replace distributor if necessary refer to section 1 07 4 Before cover installation make sure o ring seal 4 is properly seated and lightly coated with hydraulic oil Check to ensure that location tabs 5 of distributor are correctly seated NOTE 2 SPEED MOTORS HAVE TWO SETS OF TABS REFER TO FIGURE 76B FOR PROPER ALIGNMENT Carefully set distribution cover 3 onto cam ring and align holes Install original socket head bolts 6 to secure cover and cam ring to bearing support Using a metric hex key or hex driver alternately tighten bolts Torque bolts to a value of 74 foot pounds ft lbs 222 ft lbs MS11 motor Proceed to following page for inspection of accumulator and priming of motor before remounting onto machine FIGURE 54 FIGURE 55 85 1 07 SERVICE PROCEDURES SEALS AND BEARINGS THIS PAGE LEFT BLANK PER ECR F4067 86 1 07 SERVICE PROCEDURES SEALS AND BEARINGS PRIMING MOTOR B Refer to figure 57 Remove one or both bleed screws 6 ftom distributor cover 2 using 7 millimeter mm or larger hex key Fill motor through distributor cavity 4 with approximately one quart of fresh hydraulic oil or until oil f
56. in outer tie rod tube Torque locknuts to 60 80 ft Ibs 18 SYSTEM OPERATION 5 ADJUSTMENTS AND MAINTENANCE continued B The tapered end s of both the tie rod and power steering cylinder s need to be tight at all times On an initial installation these should be checked about every four hours the first day then every day the first week Eventually the tapered surface work hardens and cannot be tightened b y 1 The adjustable wheel stops should be set to take full advantage of the maximum steering angle that is available unless the steering needs to be limited to avoid tire interference The wheel stops on each wheel drive assembly should be set to minimize the load on the tie rod Adjusting steering stops if necessary Locate steering stop bolts at the top left and right of the king pin housing bolted to axle endplate Adjustin ring 5 n Locate steering stop bolts at the top left and right of the king pin housing bolted to axle endplate STOP BOLTS AND JAM NUTS TIE ROD EAR STOP BOLT k JAM NUT PROCEDURE FOR COMBINES COTTON PICKERS SIMILAR BUT USE ONLY TWO STOP BOLTS 1 Loosen the jam nuts and screw all four stop bolts completely in 2 Turn the steering wheel a full turn to the right 3 Adjust the left rear and right front stop bolts to touch the edge of the wheel motor mounting frame Tighten the jam nuts Turn the steering wheel a full turn to the left Adjust the
57. ite end The spool will move to close off the passage to the wheel motor and tire that is slipping The main oil flow will then be diverted to the other wheel motor When the slipping wheel regains traction the pressure drop across the fixed orifices in the flow divider spool again becomes equal and the spool returns to center In actual operation the movement of the spool occurs repetitively causing the spool to modulate frequently 23 EQUA TRAC Il VALVE OPERATION FUNCTION OF INTERNAL COMPONENTS continued SPLIT FLOW DIVIDER SPOOLS INSTALLED IN LATE MODEL VALVES These types of flow divider spools have been designed to replace the existing flow divider spools found in early model E T II valves in MUD HOG kits sold up to late 1989 early 1990 The split flow divider spools operate in a similar manner to the standard flow divider spools in that pressure is maintained to the non spinning wheel when the opposite wheel is spinning However the split flow divider spools provide the additional feature of limiting the maximum amount of flow to the rear drive axle For example with the split divider spools and their 328 inch diameter orifices approximately 18 gpm can travel to each wheel motor before the split spool shifts limiting additional flow to that wheel motor Therefore a maximum oil flow of approximately 36 gpm can travel to the RWD if both split spools are activated With the standard flow divider spool if both rear wheels are spinnin
58. lamps 4 to wheel motor mounting frame then lift off clamp plate 5 and top clamp halves Loosen tube nuts 6 connecting high pressure tubes to each wheel motor fitting 7 and disconnect tubes from fittings Plug each tube but do not disconnect high pressure hoses 8 Temporarily secure tubes away from wheel motor Cap fittings on wheel motor to prevent damage to fittings when removing motor from mounting frame and also to keep contamination out of motor NOTE If motor case drain hose 1 and case flushing supply hose 2 are NOT plugged when disconnected oil from reservoir will drain from hose end FIGURE 9 58 1 06 MOTOR REMOVAL FROM MACHINE E Refer to figure 10 Using a floor jack or lifting device of adequate capacity support wheel motor while removing wheel motor mounting bolts and machinery bushings 1 CAREFULLY remove motor and move it to a Suitable work bench CAUTION The wheel motor is very heavy 127 lbs M908 amp ME08 185 Ibs MS11 Use extreme care when removing and handling motor to prevent personal injury and damage to wheel motor and fittings FIGURE 10 SEE n SHOP LIFT WHEEL MOTOR MOUNTING FRAME j 59 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 07 SERVICE PROCEDURES TABLE OF CONTENTS COMPONENT ILLUSTRATIONS 1 07 1 PAGE NO 1 Pictorial Exploded Wheel Motor Components 61 2 Wheel Motor Cross Section 62 SHAFT GREASE SEALS AND BEARINGS 1 07 2 1 Disass
59. ld The operator will gain these advan tages 1 The machine will be operating at lower pressure thereby helping to extend the life of the main hydrostatic transmission and gear train 2 Theoperator will have improved steering obtained by powering the rear steerable wheels 3 Finally the temperature of the hydrostatic oil will normally be lower as a result of running the machine at lower system pressure Roading the Machine For roading the machine the operator can switch the RWD off to obtain higher road speeds The cam lobe motors automatically free wheel when the RWD is turned off There is NO LIMIT to the distance the machine can be driven on the road at one time ELECTRICAL COMPONENTS AND CONTROLS The MUD HOG RWD can be engaged by use of a toggle or rocker switch located in the cab Electrical current travels from the ignition switch through a 10 amp fuse to the ON OFF switch When the switch is ON current also travels to the solenoid valve at the Equa Trac Il valve When the switch is OFF currentis NOT transferred to the solenoid valve 10 AMP FUSE TQ IGNITION SWITCH SYSTEM OPERATION ELECTRICAL COMPONENTS AND CONTROLS continued SOLENOID VALVE The solenoid valve contains a 12 volt coil which activates a plunger within a cartridge when energized The valve directs charge pressure provided by the machine s charge pump to a spool within the Equa Trac II valve via an internal shuttle spool no external ch
60. lenoid cartridge and back to the hydraulic oil reservoir tank When the solenoid valve is energized the cartridge directs charge pressure oil to the ON end of the spool and drains the OFF end spring end When the solenoid valve is deenergized the cartridge directs charge pressure oil to the OFF end and drains the ON end of the spool c FLOW CENTER ile FLOW DIRECT p C Y T 5 FLOW A FLOW B 4 WAY TWO POSITION 7 SOLENOID CARTRIDGE VALVE EQUA TRAC II VALVE SYSTEM OFF DISENGAGED OPERATION DESCRIPTIONS continued RN MN F AA 1 ae D cogi IL xm Df fas an MN Mem m 5 Xu ilr a R ST With the MUD HOG system off charge pressure oil in the E T II valve is at the OFF spring end cavity E of the selector spool and cavity G is exposed to the tank through the solenoid cartridge valve Charge pressure oil in cavity E combined with the spring force holds the spool in the OFF position The spool prevents system pressure oil from entering either the forward or reverse inlet port and the rest of the valve therefore no high pressure oil is delivered to the wheel motors Passage D controls the speed that the spool shifts to the OFF position because the charge pressure oil has to flow through the same passage to get into cavity E to shift the spool In the OFF position of the spool cavities H and J are closed off from cavities K and L Cavities H and J ar
61. lows out of bleed screw holes s NOTE Use hydraulic oil that meets or exceeds specification for hydrostatic system of machine C Reinstall and tighten bleed screws s Lightly coat o ring seal 5 with clean hydraulic oil and reinstall cover plate onto distributor cover Torque cover plate bolts to 88 ft Ibs 90 ft lbs MS11 motor D Proceed with section 1 08 for motor installation onto machine FIGURE 57 87 1 07 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 DISASSEMBLY CYLINDER BLOCK REMOVAL A Remove wheel motor from machine Refer to Section 1 06 B Refer to figure 58 and to illustrations on pages 61 and 62 Remove 14 of 16 total or 10 of 12 total MS11 motor socket head bolts 1 securing distribu tion cover 2 to cam ring 3 and bearing support housing 4 using 10 mm or larger hex key or hex driver Leave two bolts partially engaged turn motor horizontal and break open to drain oil Set motor into the tank of a parts washer with wheel studs down Remove remaining bolts 88 1 07 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES DISASSEMBLY CYLINDER BLOCK REMOVAL C Refer to figures 59 and 60 CAREFULLY lift distribution cover from cam ring NOTE If cover is lifted straight up distributor 1 will tend to adhere to cylinder block 2 because of oil film between mating surfaces To insure that distributor remains seated in cover lift cover one side only to b
62. ly demands Moving over rough terrain and the rolling resistance from the tires in contact with the ground surface will contribute to the reduction of the proper amount of supply pressure to power the wheel motors Charge pressure helps to maintain a near constant laminar and positive oil flow at system pressure Charge pressure oil flow is generated by the fixed displacement charge pump driven off of the main hydrostatic variable placement pump A MUD HOG SYSTEM OFF FORWARD OR REVERSE When the MUD HOGsystem is OFF and the main hydrostatic transmission is in neutral charge pressure 200 to 250 psi from the charge pump is supplied to the Equa Trac II E T II valve via an internal shuttle spool no external charge pressure hose Charge pressure holds the main selector spool of the E T II valve in the OFF position thereby preventing the supply of high pressure oil to the wheel motors Oil flow at a lower pressure 5 15 psi is circulated through the remainder of the E T II valve and rear drive wheel motors This oil flow keeps the wheel motors lubricated cooled and purged from air to promote longer component life If the main hydrostatic transmission is in the forward or reverse operating mode high pressure 5500 to 6000 psi will reach E T II valve but the pressure in all hoses between the E T II valve wheel motors and reservoir will remain at 10 to 15 psi as shown below System On Off Switch b Hydrostatic System Reservoir Main Hydros
63. model wheel motors it may be necessary to pry it loose with a screwdriver or other thin edged tool Using press and tool number one compress inner bearing 2 while removing snap ring 3 with external snap ring pliers FIGURE 15 FIGURE 16 1 07 SERVICE PROCEDURES DISASSEMBLY Seals and Bearings 1 07 2 G Refer to figure 17 Remove snap ring spacer 1 Remove old shims 2 and shim support washer 3 Discard shims if damaged or deformed NOTE Early versions of motor may have a select fit shim in place of shims and shim support washer This shim may be reused or replaced if necessary by using a shim pack and shim support washer FIGURE 17 66 1 07 SERVICE PROCEDURES DISASSEMBLY Seals and Bearings 1 07 2 H Refer to figure 18 Using tool number two a 3 4 bolt and four bolts from motor extract wheel shaft 1 from bearing support housing 2 Tighten four bolts and use 3 4 bolt as a jack screw to pull bearing support housing off of shaft NOTE The entire inner bearing outer race of outer bearing and inner shaft seal will come off the bearing support housing Rollers and inner race of outer bearing outer grease seal and deflector will remain on wheel shaft Lift out inner race and rollers of inner bearing from bearing support housing NOTE Make sure bearing rotates freely without roughness and does NOT show signs of extreme wear If replacement is necessary replace both bearing and cup outer
64. motors and back to the return side of the hydrostatic circuit In the reverse operation mode the process is switched where passages L and J are open to each other to provide reverse system pressure to the reverse pressure inlet ports on the motors Passages H and K allow return flow to come from the motors When the MUD HOG system is first engaged and charge pressure oil is introduced to cavity G the orifice in passage D See OFF diagram controls the rate that the oil is exhausted from cavity E while the spool shifts to the ON position Passage D is an internal passage in the valve casting The pas sage between the solenoid cartridge valve and the ON end of the spool opposite spring end is an external steel tube 28 SECTION SYSTEM TROUBLE SHOOTING AND TESTING FOR MUD HOG SYSTEM Il Ill and IV REAR WHEEL DRIVE PRELIMINARY TROUBLESHOOTING CHECKS 1 With the engine of the machine shut 4 Determine if the hydrostatic filter is off check for evidence of external oil plugged or damaged A filter that has leakage around seals housings or failed will permit oil to bypass the sys hose connections Also check for tem affecting system operation and pinched or kinked hoses and steel tests If the filter is plugged examine the lines that could restrict oil flow and contamination to determine what may cause excessive heat build up in the have caused the failure hydraulic oil 2 Check hydraulic oil level in reservoir 5 Check the maintenan
65. pressure is balanced between the hydraulic motor near the main drive axle and the wheel motors The cam lobe wheel motors have a fixed displacement so the amount of wheel torque or draw bar pull obtained is determined only by hydrostatic pressure As long as all four wheels maintain good traction the pump will provide adequate flow at whatever pressure is required to maintain a desired speed If one or both of the front wheels start s to spin loses traction most of the oil flows to the spinning wheel s and pressure to the other wheels is greatly reduced Therefore it is important to maintain traction with the front wheels in order to obtain the most pull with the front wheels Wheel spin out can be stopped by shifting to the next higher gear ration to reduce the amount of torque on the front wheels or by lightly applying the brakes Naturally one factor that affects front tire traction 15 the type and size of tire used Because of the many variations in soil types and operating conditions that can change from day to day it 1s not possible to recommend one tire that will work for all conditions Local experience is usually the best guide Another factor that affects wheel traction is the balance of pull between the front and rear wheels This balance is affected by tire size and by the weight distribution between the front and rear axles SYSTEM OPERATION PERFORMANCE continued It is best to use the RWD AT ALL TIMES when working in a fie
66. re that grease seal 3 is properly centered to fit into bore of bearing support housing as it is lowered into place Rotate bearing support housing while applying downward force to work parts into place DEFLECTOR FIGURE 37 78 1 07 SERVICE PROCEDURES SEALS AND BEARINGS 1 07 2 REASSEMBLY Installation of Bearing Support Housing and Related Parts B Refer to figure 38 Set inner race and rollers of the inner bearing 1 onto wheel shaft 2 IMPORTANT Do NOT pack bearing with grease Bearing is lubricated by hydraulic oil Pressing Inner Bearing Roller Race Onto Shaft A Refer to figure 39 Position wheel shaft 1 in a hydraulic press capable of applying 30 000 pounds of force NOTE Do NOT pick up bearing support housing 2 without the inner bearing race 3 pressed in place Place steel arbor plates 4 between wheel studs to support shaft so that press force is NOT applied directly onto wheel studs 5 Place pressing tool number 1 on top of bearing race 3 Press bearing down onto shaft until bearing rollers are firmly seated against outer race Relieve pressing force and remove tool FIGURE 38 FIGURE 39 Installation of Bearing Pre Load Shims and Related Parts If one or both bearings have been replaced bearing pre load must be adjusted according to the following procedure found on page 80 If all original bearings are used original shim thickness may be used Replace shim support washer and shims if ne
67. reak adhesion between distributor and cylinder block ALTERNATE METHOD CAREFULLY insert thin piece of wood under location tab 3 of distributor and pry up to break adhesion CAUTION Inserting wood too far may scratch mating surfaces of distributor and or cylinder block Remove cam ring 4 and discard large O ring seals on distribution cover and bearing support housing FIGURE 59 89 1 07 3 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1 07 3 DISASSEMBLY CYLINDER BLOCK REMOVAL D Refer to figure 61 CAREFULLY remove cylinder block assembly 1 from splined wheel shaft 2 by lifting straight up If necessary apply leverage under block on opposite sides at same time FIGURE 617 E Refer to figure 62 Check condition of cylinder block 1 Inspect distributor mating surface 2 of cylinder block and cylinder block mating surface 3 of distributor valve block for deep scratches nicks or uneven wear Inspect splines 4 on cylinder block and on wheel shaft for extreme wear or chips Check for uneven wear patterns on lobes of cam ring 5 possibly indicating problems with the pistons and or rollers If cylinder block is damaged as described earlier replace with new cylinder block assembly including pistons and rollers and if necessary replace distributor FIGURE 62 Q h tmc Re 2 D Ro m on 90 1 07 SERVICE PROCEDURES CYLINDER BLOCK AND PISTON ASSEMBLIES 1
68. rial Number Location on one or both sides for all System II III or IV Units Example 8 16 132 For Fluidrive Use Only Week of Year Drive System Manufactured Year of Manufacture For late model MUD HOGS The serial number tag is located on the axle Note When ordering service parts supply Tuthill Transport Technologies with information from both the above items 48 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Path of One Piston A INITIAL SUPPLY POSITION DRIVE SYSTEM ENGAGED Refer to figure 1 To start the drive cycle hydraulic oil under high system pressure up to 5500 6000psi is delivered from the main hydrostatic pump and is directed through the Equa Trac Il valve then supplied equally to the high pressure ports 1 at the wheel motors The oil is diverted through a port passage 2 in the distributor 3 and a port 4 in the cylinder block 5 which are partially aligned also see figure 1 6 allowing oil to begin entering the cylinder cavity 6 behind the piston 7 The high pressure oil pushes the piston outward causing the roller 8 to make contact with the cam lobe 9 just after the peak highest point of the lobe This contact causes the cylinder block 5 to start rotating SYSTEM PRESSURE OU T LA SS Se A B da WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Path
69. right rear and left front stop bolts to touch the wheel motor frame Tighten the jam nuts Check for adequate tire clearance with narrow tread center settings and extreme axle oscilla tion with wheels fully turned in both directions Make any necessary adjustments and return the wheels to a straight ahead position 19 5 SYSTEM OPERATION ADJUSTMENTS AND MAINTENANCE continued D WHEEL MOTOR BEARINGS NO MAINTENANCE REQUIRED General Information The outboard bearing of each wheel motoris lubricated with grease in a permanently sealed cavity The inboard bearing of each wheel motor is lubricated by the hydraulic oil in the motor case therefore no maintenance is required for either bearing INBOARD BEARING LI Cugew S OUTBOARD BEARIMG KING PIN BUSHINGS Grease king pin bushings by pumping a high quality bearing grease into the upper and lower grease Zerk fittings located on each wheel motor steering frame for combines or into grease zerk fitting on each stub axle for cotton pickers at about every 50 hours of machine operation GREASE ZERK FITTINGS COMBINE COTTON PICKER WHEEL LUG NUTS Torque the wheel lug nuts securing the wheel and tire assembly to the wheel motor flange to 300 320 ft Ibs Overtightening the lug nuts could damage the wheel studs Periodic checks should be made to make sure the nuts are tight 20 SECTION B EQUA TRAC II VALVE OPERATION covered by U S
70. rostatic Drive Wheel Motor MUD HOG WHEEL DRIVE SYSTEM Displacement Control charge pressure On MUD HOG units that have two speed wheel motors the motors are shifted from full to half displacement through the use of a displacement control valve Energizing the solenoid on the displacement control valve shifts the wheel motors from full displacement to half displacement The displacement control system utilizes charge pressure from the ET II valve to shift the wheel motors One 1 4 hydraulic hose connects the external charge pressure tube on the ET II valve to the port stamped P on the displacement control valve Another 1 4 hydraulic hose con nects the drain from the ET II valve to the port stamped T on the displacement control valve Two 1 4 hoses connect the wheel motors to the port stamped M on the displacement control valve 14 SYSTEM OPERATION 4 OPERATIONAL CIRCUIT DIAGRAMS The MUD HOGrear wheel drive circuit utilizes hydraulic oil flowing at three different pressures change pressure system pressure and motor case drain pressure These pressures are shown in the dia grams in this section CHARGE PRESSURE Charge pressure is needed to provide the minimum oil pressure that is neces sary for operation cooling and lubrication during system operation It also provides a charge to the system pressure that propels the machine During the operation of the machine the system pressure will fluctuate due to the supp
71. s system operation section provides information on ae Performance Electrical Components and Controls Hydrostatic Circuitry Description Operational Circuit Diagrams Adjustments and Maintenance Since the major components provided in a MUD HOG rear wheel drive kit are similar for all combines and four wheel cotton pickers information in this section is general it is applicable to any hydrostatic machine equipped with a MUD HOG rear wheel drive system For more detailed information on system installation replacement parts and servicing refer to the installation operation manual and parts catalog available through the dealership for from Tuthill Drive Systems for the specific rear wheel drive kit 1 PERFORMANCE A MUD HOG System II III or IV rear wheel drive RWD equipped machine now has more overall draw bar pull to help get through tough field conditions such as heavy mud or soft sandy soil The operator will also be able to maintain better steering control in slippery conditions or on hill sides Even in less muddy conditions with all four wheels pulling the machine will roll over the field with less rutting The MUD HOG drive system is simply an extension of the machine s hydrostatic drive system Whenever the RWD is engaged the Equa Trac II valve diverts some of the oil flow from the hydrostatic pump to the wheel motors in the RWD system The oil flows to the path where resistance is the lease until the hydrostatic
72. stalled hydraulic components This procedure also serves to check proper plumbing of the hydraulic circuit ITIS IMPORTANT THAT THESE INSTRUCTIONS BE CARRIED OUT AS SPECIFIED Any alteration of this procedure will defeat its purpose which is to bleed air out of the system and flush any possible contamina tion from the closed loop Special attention must be given to the 1 2 inch limited movement of the hydrostatic control lever as it is critical not to allow excessive oil flow during this procedure If at any time while performing this procedure a malfunction occurs that causes the hydrostatic system to be reopened such as disconnecting a hose or fitting it is necessary to begin the procedure again at STEP 1 STEPS 1 7 of this procedure are performed with the front drive wheels of the machine on the ground and chocked securely and the MUD HOG equipped rear axle raised and secured such that the rear wheels remain off of the ground with sufficient clearance to rotate freely STEPS 8 and 9 are performed with all wheels on the ground and sufficient operating clearance around the machine At all times maintain proper fluid level in the hydrostatic reservoir e enm am pem CHECK CORRECT ROTATION HIGH IDLE NEUTRAL AM OF MUD HOG SEE NOTE s NOTE A If wheel s rotate reverse go to STEP 6 On Case 2555 Cotton Pickers lockout switch must B If no rotation go to STEP 5 DO NOT repeat check valve be activated to allow E T II Valv
73. tatic System Motor Split System E t Hydrostatic Drive Wheel Motor High Reverse Pressure Pressure Relief Manifold Block E OS 2 5 Manifold Adafate Block FORWARD HIGH PRESSURE mmm CHARGE PRESSURE a SYSTEM OFF CASE DRAIN RETURN SYSTEM OPERATION 4 OPERATIONAL CIRCUIT DIAGRAMS continued SYSTEM PRESSURE System pressure 5500 to 6000 psi is generated by the variable displacement pump and is directed to the fixed displacement motor split systems The high pressure oil flow passes through the manifold adapter block s if equipped and on to the Equa Trac II valve where the flow is divided to drive the right and left wheel motors B MUD HOG SYSTEM ON FORWARD When the MUD HOG system is ON the solenoid coil at the E T II valve is energized Charge pressure oil initially moves the selector spool in the valve toward the ON position After the initial flow of charge pressure oil to the wheel motors further movement of the selector spool opens ports connected to the high system pressure flow coming from the forward pressure side of the fixed displacement motor and through the 3 4 high pressure hoses The high pressure oil flow is equally split between the two wheel motors as the oil passes through the forward flow divider spool within the valve Oil flow returns from the wheel motors at charge pressure and passes through the reverse side of the E T II valve and back to the fixed displacement motor Motor
74. teel washer and slotted thrust washer on wheel motor mounting frame as shown in illustrated parts breakdown Use high quality wheel bearing grease C Install king pin and wheel motor mounting frame assembly into axle end housing and support in place D While mounting frame is being supported install tie rod end mounting ear onto end of king pin using key s to secure in proper position Install retaining cap 7 8 hardened washer and 7 8 bolt Torque bolt to 450 500 ft lbs Check for smooth pivoting of mounting frame E Heconnect tie rod and steering cylinder end if necessary to tie rod end mounting ear and or mounting frame ear Use new cotter pins Torque mounting nuts to proper specification F Reinstall wheel motor onto mounting frame Refer to page 106 of this manual Be sure to properly torque wheel motor mounting bolts G Reconnect hydraulic hoses to wheel motor tube fittings Refer to page 106 H Reinstall wheel and tire assembly and torque lug nuts to proper specification l Perform start up procedure found on page 35 of this manual 43 SECTION E WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 1 09 TABLE OF CONTENST GENERAL INFORMATION WHEEL MOTOR IDENTIFICATION WHEEL MOTOR OPERATION MOTOR PROBLEM DIAGNOSIS TROUBLESHOOTING SPECIAL TOOLS MATERIALS MOTOR REMOVAL FROM MACHINE SERVICE PROCEDURES Table of Contents on page 59 1 07 1 Component Ill
75. the pistons in one revolu tion of the cylinder block splined to the wheel shaft A 76 CID wheel motor System contains eight pistons and six cam lobes for a total of 48 power strokes by the pistons in one revolution of its cylinder block Each piston and roller travels up and down each of the eight cam lobes in a smooth uninterrupted manner producing a constant torque output with a low noise level With an even number of pistons and cam lobes the internal forces of the motor are balanced allowing the motor bearings to be totally available to accept high radial and axial loads To change the direction of rotation of the motor the input supply of high pressure oil is directed through the reverse high pressure port and is diverted through the distributor of the motor in a manner opposite that of the forward rotation of the motor SYSTEM ENGAGED Figure 6 CROSS SECTION EXAMPLE ONLY ai System Operating Pressure m Return Charge Pressure 54 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 03 WHEEL MOTOR OPERATION Operating Principle Drive System Disengaged G WHEEL MOTOR POWER DISTRIBUTION Disengaged When the drive system is shut off disengaged the Equa Trac valve prevents high system pressure oil from being supplied to the wheel motors To accomplish this charge pressure from the return side of the hydrostatic system is directed through the valve to move the directional control spool within
76. the valve to block off oil flow pas sages to the motors In addition oil flow in system pressure supply lines from the valve to the motors is routed directly to the reservoir through the valve so that any pressure in these lines is dissipated The lack of pressure on either side of the pistons enables the pistons and rollers to retract into their cylinder bores when the rollers are pushed inward by the cam lobes as the cylinder block rotates With the rollers clear of the cam lobes the cylinder block and wheel shaft are able to rotate in a Free Wheeling NON DRIVE manner SYSTEM DISENGAGED Figure 7 CHOSS SECTION SYSTEM DISENGAGED AT THIS POINT OF THE CYCLE E ENGAGED 55 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 04 MOTOR PROBLEM DIAGNOSIS TROUBLESHOOTING COMMON PROBLEMS PROBLEM CAUSE REMEDY A MOTOR DOES NOT ROTATE OR ROTATES SLUGGISHLY NO PRESSURE Equa Trac Il valve damaged Service or replace Equa Trac Il valve EXCESSIVE INTERNAL LEAKAGE Check condition of cylinder block assembly and See subsections 1 07 3 and 1 07 4 distributor B EXTERNAL OIL LEAKS MOTOR CASE PRESSURE TOO HIGH Check to make sure that case drain lines to motors and drain line to reservoir are NOT blocked pinched c kinked Seals within motor damaged by pressure spikes elevated operating temperature use of fluid not See section 1 06 and subjection 1 07 2 approved for contaminants in oil Wheel motor incorrec
77. tional information not covered in this Tuthill Drive Systems Technical Manual contact a Tuthill Drive Systems service representative toll free 1 800 348 2474 Pictorial illustrations and part numbers of all the individual parts ina MUD HOG rear wheel drive kit can be found in a MUD HOG Parts Catalog for a specific kit and machine application IMPORTANT Cleanliness is essential when installing or servicing hydraulic components When disconnecting hydraulic components areas surrounding the connections should be steam cleaned or washed with solvent so that contamination will not enter the system Always keep hoses and connectors and ports suitably capped or covered to keep contamination out of the system e See table of contents for details NOTE MUD HOG and Equa Trac are registered trademarks of Tuthill Drive Systems SAFETY PROCEDURES READ THESE PROCEDURES COMPLETELY Make sure you fully understand all controls BEFORE operating the system The safety information given does not replace safety codes insurance needs or federal state and local laws Standard safety procedures should be observed and practiced when operating or servicing the MUD HOG system CAUTION should be practiced at all times All components MUST be securely and correctly mounted and connected BEFORE operating the system Inthe event of any malfunction in the system the MUD HOG should be shut OFF immediately and not restarted until the machine is corr
78. tly assembled or defective See section 1 07 56 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES THIS PAGE IS BLANK PER ECR F4067 57 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 06 MOTOR REMOVAL FROM MACHINE NOTE The procedures given in this subsection are for combine applications however motor removal procedures for cotton pickers are similar A Park machine in an area equipped for drainage Wash off heavy dirt and remove excess grease from exterior of wheel motor and motor mounting frame B Move machine to a clean work area Apply PARK or EMERGENCY BRAKE block front wheels to prevent machine from rolling Using a suitable lifting device such as a mobile shop crane or floor jack raise rear of machine so that rear tires are several inches off the ground Place jack stands securely under rear frame of machine DO NOT support machine under axle center section Center section can be supported to prevent pivoting NOTE It is recommended that one wheel motor be removed and serviced at a time Cleanli ness is most important in servicing the motor Always use clean tools and keep opened surfaces free of dirt C Refer to figure 9 Remove wheel and tire assembly from motor shaft hub Disconnect and plug case drain hose 1 and motor case flushing system supply hose 2 if equipped at wheel drive see note below mark hoses for proper reconection later D Refer to figure 9 Remove bolts 3 securing tube c
79. tor steerable drive assemblies are designed for a long service life provided that the bushings are periodically greased and the wheel drive units are cleaned on a regular basis In most cases complete disas sembly of wheel drives for replacement of bushings and thrust washers will not be necessary unless the ma chine and rear wheel drive axle has logged a considerable amount of field hours and or has been operated frequently in extremely dusty sandy or wet muddy environments without wheel drives being kept clean regularly 1 BASIC MAINTENANCE REQUIREMENTS A EVERY 50 HOURS OF MACHINE OPERATION Pump high quality bearing grease into grease zerks installed in wheel motor frames combines or stub axle assemblies cotton pickers The grease will enter into the inside diameter of the kingpin bushings and grease slots of thrust washer to provide proper lubrication for the steering movement of the wheel motor mount frames See figure 1 below and figure 2 on page 37 i pom BUSHING imi Soe eS a RETAINING CROSS SECTION RING FIGURE 1 COMBINE 36 WHEEL DRIVE MAINTENANCE CONTINUED 1 BASIC MAINTENANCE REQUIREMENTS continued COTTON PICKERS STEEL WASHER E THRUST WASHER TORQUE TO 450 500 FT LBS B EVERY 100 HOURS OF MACHINE OPERATION Check tightness of wheel drive and wheel motor mounting bolts For wheel motor mounting bolts torque to 180 210 ft lbs for 508 08 and MS16
80. two sets of tab ears for the distributor to seat into One set of ears is for a right hand motor and the other set of ears is for the left hand motor Refer to Figure 76B for proper alignment of the distributor 2 Speed wheel motors have more pulling power in forward than reverse so itis important to get the distributor installed correctly Referto figure 77 Apply a small amount of grease or petroleum jelly at several locations in large o ring groove of distribution cover 1 Install new o ring seal into groove and lightiy coat o ring with clean hydraulic oil CAREFULLY set distribution cover onto cam ring 2 and align holes Install 16 or 12 original socket head bolts 3 to secure cover and cam ring to bearing support housing 4 Using a 10 mm or larger hex key or hex driver alternately tighten bolts Torque bolts to a value of 74 ft Ibs 222 ft Ibs MS11 motor FIGURE 77 1 07 SERVICE PROCEDURES DISTRIBUTOR AND DISTRIBUTION SEALS 1 07 4 REASSEMBLY DISTRIBUTOR FIGURE 76B LEFT HAND MOTOR 101 1 07 SERVICE PROCEDURES THIS SHEET REPLACES PAGES 102 103 AND 104 PER ECR F4067 1 07 SERVICE PROCEDURES 2 SPEED COMPONENTS 1 07 6 A Refer to figure 82A To inspect 2 speed components remove the cover plate from end of the motor Be CAREFUL the cover plate is spring loaded Remove the snap ring from the end of the spool Remove the washer spring spool and o ring and inspect these for wear Repla
81. ustrations 1 07 2 Shaft Grease Seals and Bearings 1 07 3 Cylinder Block and Piston Assemblies 1 07 4 Distributor Valve Block and Distribution Seals 1 07 5 2 Speed Components MOTOR INSTALLATION ONTO MACHINE 1 08 1 Remounting 1 08 2 Start up Procedures ROUTINE MAINTENANCE CARE 1 09 1 General Recommendations INFORMATION IN THIS SECTION IS PROPRIETARY PROPERTY OF TUTHILL DRIVE SYSTEMS 44 45 47 49 56 57 58 60 106 110 WHEEL MOTOR OPERATION AND SERVICE PROCEDURES 1 01 GENERAL INFORMATION e DESCRIPTION The hydraulic wheel motors used on the MUD HOG auxiliary drive system are of a cam lobe design which in general utilize pressurized hydraulic oil to force pistons and their matching rollers against machine formed lobes to produce mechanical power under full displacement The components of the wheel motor that transform hydraulic power pressure flow into mechanical power torque rotation consist of the cylinder block and cam lobe ring The cylinder block houses 8 or 10 radially spaced pistons and rollers The block is monted to the splined wheel shaft and is positioned inside the cam ring The pistons within the cylinder block are fitted with piston rings to ensure high volumetric efficiency e SERVICE APPLICATION Refer to page 47 to aid in wheel motor identification The service procedures in this section of the manual apply to all available displacements of wheel motors used on the MUD HOG au
82. xiliary drive system Wheel motor displacements are as follows 48 cubic inch displacement CID and 57 CID System 76 CID System and 96 CID System IV The sole difference between the 48 and 57 CID motors System II originates with the cam ring The lobes on the cam ring are machined to achieve the required displacement Other components within the wheel motors are interchangeable between the 48 and 57 CID wheel motors The 76 CID MS11 wheel motors that are used with System III wheel drive kits are visually larger that the 48 and 57 CID motors The internal components are similar but larger in comparison to those in the System wheel motor and they have the same function The 76 CID MEOS wheel motors are the same physical size as the 48 and 57 CID 508 The extra displacement is achieved internal to the wheel motor The 96 CID MS16 wheel motors are similar in size to the 48 and 57 CID 508 and to the 76 CID MEOS motors The only difference in size is the width of the cam ring The cam ring on a 96 CID motor houses a double row of pistons and thus is wider The illustrations used in the service procedures show 48 57 CID System II wheel motors Due to the similarities of the System III and System IV wheel motors to the System II wheel motors the service procedures can also be applied to System III and System IV motors except where noted 45 1 01 GENERAL INFORMATION DISASSEMBLY The instructions in this procedur

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