3/4/500 EATON 11 HYDROSTATIC TRANSMISSION - WH TRANSAXLE Table of Contents – Page 1 of 2 FOREWORD SPECIFICATIONS TRANSMISSION: TRANSAXLE: MAINTENANCE: GENERAL INFORMATION TRANSMISSION DESCRIPTION AND IDENTIFICATION MARKINGS PRINCIPLES OF OPERATION TRANSMISSION SYSTEM SYSTEM OPERATION TRANSMISSION OPERATION TROUBLESHOOTING PROBLEM DIAGNOSIS GENERAL SYSTEM CHECKS OIL SYSTEM COOLING SYSTEM ENGINE AND INPUT DRIVE MOTION CONTROL LINKAGE TRANSAXLE HYDROSTATIC TRANSMISSION TROUBLESHOOTING GUIDE TRACTOR WILL NOT OP
3/4/500 EATON 11 HYDROSTATIC TRANSMISSION - WH TRANSAXLE Table of Contents – Page 2 of 2 REPAIR OPERATIONS GENERAL INFORMATION HYDRAULIC HOSES - HYDRAULIC LIFT CONTROL VALVE REMOVAL INSTALLATION TRANSMISSION REMOVAL PULLEY, GEAR AND CAM PLATE REMOVAL INSTALLATION TRANSAXLE IN-VEHICLE SERVICE CASE HALF SERVICE INTERMEDIATE GEAR AND DIFFERENTIAL SERVICE TRANSAXLE REASSEMBLY TRANSMISSION SYSTEM REMOVAL INSTALLATION INTERNAL TRANSMISSION SERVICE TRANSAXLE TRANSAXLE TRANSMISSION AND FILTER TRANSMISSION AND FILTE
TRANSMISSION REPAIR MANUAL Printed in U.S.A. 1186 Form 1492-4205 PART NO.
FOREWORD This service and repair manual hasbeencompiled with the proper procedures authorized Wheel Horse service personnel Wheel Horse automatictransaxle and techniques forservicingthe with EatonModel toprovide 1 1 hydrostatictransmission. The following Table of Contentslists all areascovered. It is advisable to read all of the introductory sections first to gain a proper understanding of theWheelHorseautomatictransmissionsystem.
SPECIFICATIONS TRANSMISSION: Eaton Model 11; Radial,Ball-piston Pump and Motor with Auxiliary Charge Pump. Displacement: Pump, Variable 0-1.10 cu. in/rev. Motor, Fixed. 2.09 cu. in./rev. Speed (as used): Input 3400 RMP Output 0-1750 RPM Torque Output (Max.) Continuous 360 in. Ibs. Intermittent 540 in. Ibs. Operating Temperature: Maximum Continuous 18OoF Cooling: 8”DiameterFan Plus Oil FlowFromChargePump Oil Filter (as used) 10 Micron, Full-flow, Spin-on Type Charge Pump (3400 R P M Input) 3.
The Eaton Model 1 1 hydrostatic transmission,as used by Wheel Horse, i s equipped withan internal charge pressure relief valve, forwardand reverse check :and acceleration valves, and vibration dampening pistons.Transmissionhas a splined output shaft and keyed input shaft, both of which are supported byball bearings. Besides makingup for normal internal transmissionleakage, charge pump i s used to operate tractor's hydraulic lift system.
FIG. 4. left Side FIG. 5. Controls DIRECTION OF INPUT SHAFT MANUFACTURING DATE FIG. 2. Identification Markings PRINCIPLES OF OPERATION SYSTEM OPERATION TRANSMISSION SYSTEM Major parts of Wheel Horse automatic transmission system are identified in Figs. 3-5. Transmission input shaft i s driven at engine speed bydrive belt. Both charge pumpand transmission pump are driven by input shaft.
FIG. 6.
Hydraulic lift circuit is also operated by charge pump. When lift control valve is moved to Raiseor Lower position, charge pump output i s diverted to one of hoses attached to lift cylinder. Other hose is connected through control valve to charge pressurehose leading to oil filter, permitting bleed-off of oil on that side of lift cylinder'spiston. Implement reliefvalve located in control valve regulates lift systempressure to 700 PSI.
Whencontrol shaft i s moved from neutral to "reverse" direction,cam ring i s swung off center to opposite side of pump and flow from pump is "reversed". This flow i s directed to other side of motor causing its output shaft to rotate in opposite direction. Pump input shaft always rotates in one direction, dictated by engine, while motor output shaft rotates in either direction depending on direction of flow from pump. Pumpdischarge flow is high pressure (dictated by load) fluid.
TROUBLESHOOTING PROBLEM DIAGNOSIS To save time and expense, a systematic approach should be used when troubleshooting any transmission problem, starting with a thorough understanding of how the system operates. Trouble symptoms should be carefully noted and compared to Troubleshooting Guide. Whenever a problem occurs ALWAYSCHECKTHESE ENGINE AND INPUTDRIVE 1. Check engine for correct no-load RPM. 2. Run engine atload ITEMS FIRST: 1. Transmission oil level and condition. 3.
TROUBLESHOOTING GUIDE TRACTOR WILL NOT OPERATE IN EITHER DIRECTION IF THE HYDRAULIC LIFT SYSTEM OPERATES NORMALLY THE TRANSMISSION CHARGE PUMP IS WORKING. CHECK MOTION CONTROL LINKAGE I I PROPER LEVEL CHECK CHARGE PRESSURE LOW INSPECT FITTINGS, LINES, HOSES, HYDRAULIC LIFT VALVE FOR BLOCKAGE .
TRACTOR OPERATES IN BOTH DIRECTIONS, BUT LOSES POWER AS OIL BECOMES HOT. TRANSMISSION OVERHEATS CHECK OIL CONDITION COOLING FINS SIGNS LOW I OF FAULTY OVERHEATING OVERLOADED DlRTY OR WATER I TRACTOR I MAINTAIN FULL ENGINE RPM, REDUCE SPEED AND LOAD TRANS.
R TRACTOR DOES NOT RETURN TO NEUTRAL. TRACTOR OPERATES NORMALLY IN ONE DIRECTION, BUT IS VERY SLOW IN OPPOSITE DIRECTION. TRACTOR OPERATES IN ONLY ONE DIRECTION.
HYDRAULIC LIFT SYSTEM DOES NOT OPERATE, OR DOES NOT OPERATE PROPERLY; TRACTOR OPERATES NORMALLY. CONTROL VALVE, REPLACE SYSTEM LIFT AND CYLINDER, PRESSURE HOSES CYLINDER LIFT LOW REPLACELEVELPROPER CONTROL VALVE LOW CHECK IMPLEMENT LIFT SYSTEM PRESSURE I REPLACE HYDROSTATIC TRANSMISSION Probable Defect: Charge Pump Can Not Develop Full Output' OIL FILTER HYDRAULIC LIFT VALVE FOR PARTIAL FAULTY REPAIR OR REPLACE 'Charge Pump Can be Damaged by Improperly Set Implement Relief Valve.
DUALACTIONBRAKEBANDADJUSTMENT ADJUSTMENTS GENERAL Brake drum i s mounted on first intermediate gear shaft, which extends througha needle bearingand seal in left transaxle case half. Brake band i s applied by rodsconnected to Brake/Return to Neutral pedal. transmission is returned Brake i s appliedonlyafter to neutral, and i s used to keep tractor fromrolling after it hasbeenstopped.Brakealsoservesas tractor's parking brake.
D) Adjust position of cam plate so that right edge of friction washer i s even with right end of slot in cam plate. E) Adjust rod end on control rod so thatbolt enters hole in control arm exactly at a right angle (square) to it. F) If a satisfactory neutral still cannot beobtained, check linkage for wear or damage. 8. Afterneutral hasbeenset, check that motion control lever i s centered in notch of detent spring. Spring hasslotted bolt holes so it may be adjusted tolineup notch with lever.
IMPLEMENT LIFT SYSTEM Because no tractor disassembly is required i n order to gain access to test point, it is suggested that implement system pressure be checked early in any troubleshooting routine as amatterof convenience. A correct lift system pressure reading indicates a good charge pump. A suggested gauge system is illustrated in Fig. 15. GAUGE 0-1000 PSI LIFT CYLINDER I N CIRCUIT WHEEL HORSE 7752 PLUG W STEEL OR BRASS TEE '/4 OR N.P.T.
1. Remove pipeplugand 2. connect gaugedirectly to filter base. Although thread i s 1/4-18 NPT, it will accept a 1/2-20 SAE fitting for test purposes. Operate engine. Normal chargepressure is 30Troubleshooting 90 PSI. Refer toappropriate Chart for troubleshooting procedures. Always check implement lift pressure relief valves for signs of tampering if charge presset too high wil suer is low. A relief valve cause permanent internaldamageto charge pump and hydrostatic transmission.
10. Remove cooling fan. Note direction of installation. 11. Disengage transmission clutch and remove drive belt from input pulley. 12. Disconnect rear end of motion control rod from cam plate. \ FIG. 20. Charge Pump Outlet Hose TRANSMISSION REMOVAL 1.Removeseat, rear fender, and control cover plate. 2. Support rear of tractor with jack stands placed under rear footrest cross rods. 3. Drain transmission oilfrom transaxle. 4. Remove rear wheels. 5. Close fuel shut-off valve. Remove andplug fuel hose. 6.
17. Transmission drainsthrough open bearing behind the output gear. Transmission will still be half filled with oil when removed. Remove two bolts securing bottom of transmission. Remove two bolts securing top of transmission. Remove transmission and discard gasket. FIG. 28. CamPlate and BracketRemoval 5. Fig. 29 showscam platepivotandfriction as- sembly sequence. FIG. 26. PULLEY,GEAR TransmissionRemoval AND C A M PLATE REMOVAL 1.
TRANSAXLE INSTALLATION 1. Transfer linkage, pulleyandfittingsto new transmission,as applicable. Use an anti-rust compound on inputpulley shaft (Texaco Rust Preventative, Code 1976, Compound ”L” Light, or equivalent). 2. Place a new gasket on transmission, using grease to hold it in place. 3. Install transmission on transaxle and secure in place. Use new Eslok bolts and nuts, or lockwashers. Before completely tightening hardware, start upper suction line nut onto transmission fitting.
FIG. 33. Remove Wheel Hubs,Disconnect FIG. 36. Case Half Removed Metal Line 17. Remove two intermediate gears anddifferential assembly from right case half. CASE HALF SERVICE 1. Remove and discard brake shaft seal and both FIG. 34. axle seals.Do not install new seals until transaxle i s reassembled. 2. Carefully inspect bearings in both case halves. If replacement is required, two axle shaft needle bearings canbe driven out from either inside or outside of case.
INTERMEDIATEGEAR SERVICE AND DIFFERENTIAL NOTE: When ordering repair parts, carefully identifypart numbers from parts manualthat matches your tractor VIN number. Inside diameter of differential end cap bearing was changed from 1/2 1 inch diameter to 40MM diameter. 1. First intermediate gear assembly order i s shown in Fig.39.Parts areaslip-to-light press fit. Second intermediate gear and pinion are very tight fits and normally require a large press to separate them. FIG. 41.
INSTALLATION IMPORTANT: Motor ball piston assembly mustremain Follow disassemblyinstructions in reverse order to reinstall assembly. Following notes apply: 1. On early modelsonly, be sure toguidebrake rod through brake band as assembly is moved upto tractor (Fig. 10). 2. It i s helpful to insert a couple of 3/8-16 x 2 bolts through a pair of holes in frame plate, then temporarily thread them into transaxle.
Hold pintle assembly in position against cover and remove motor rotor assembly. IMPORTANT: Each ball must be replaced in same bore from which it was removed. Use egg carton for ball storage and identification. Inspect rotor assembly.Remove piston ballsfrom rotor,one at a time, working clockwise from letter stamped in face of rotor and place in egg carton. inspect ball pistons. They must from any marks. Install ball, spring andpluginto PLUG END IN JUSTBELOWSURFACE NOTTIGHTENCOMPLETELY. pintle.
Insert 3/16” rod through check valve body to contact ball. Tap rod to push ball through retaining ring and into center portof pintle. Repeat for secondcheck valve ball. Shake pintle to remove balls from center port of pintle. CHECK a ACCELERATION V A L V E S Check \ Acceleration Pin Solid Valves Valves ACCELERATION VALVES REMOVAL FIG. 53 Acceleration Valves 3/16” Dia. Rod FIG. 51 IMPORTANT: Some models use different springs for identify springs forward and reverse.
Remove bearingretaining ring. Remove shaft retaining ring. Use 1/4” Allen wrench to remove five bolts. CAM RING REMOVAL -Control IMPORTANT: Do not pound on bearingpullerwhile Shall Insert removing charge pump body. Apply steady pull only. Do not damage bore or input shaft during removal. cam Use two jaw bearing puller, inserted in two notches machined in housing, to remove charge pump housIng. Ring Buttons CHARGEPUMPHOUSINGDlSASSEMBLY/INSPECTION Control Shall Input Bearing FIG.
Remove six carrier rolls. Remove input shaft snap ring. CONTROL SHAFT REMOVAL Remove carrier and carrier drivepinfrominput shaft. Remove pump plate. Remove square seal from cover and discard. STEP 1 STEP 2 Inspect carrier, rolls, inner racecontactareas in charge pump housing and pump plate. If any damage i s found, obtain complete new charge pump assembly. COVERDISASSEMBLY/INSPECTION Cover Assy. FIG. 61 IMPORTANT: Be careful not todamageinput bushing in cover.
IMPORTANT: Be careful not to damage inner portion of oil seal.Excessive pressingor driving of seal will damage rubber portion of seal. Lubricate 1.D. of new oil seal with clean lubricant. install seal in bore.Reinstall key,arm, washer and nut on control shaft. Install input shaft in cover. CHARGE PUMP HOUSING ASSEMBLY CHARGE PUMP PLATE INSTALLATION FIG. 68 IMPORTANT: Excessive pressing or force on oil seal may cause damage to rubber sealing portion or may distort counterbore of housing. FIG.
Install cam ringwith flush side ofbearing race facing cover. Press in firmly until cam ring has bottomed in coverassembly. CHARGE PUMP BEARING INSTALLATION IMPORTANT: Cam ring must move freely from stop to stop. If binding occurs at either stop rotate cam ring insert 180 degrees.Checkcam ring movement again. Upper Snap Ring PUMP ROTOR INSTALLATION FIG. 70 Install snap ringin lower groove ofinput shaft. Make sure input shaft i s supported and press bearing on shaft until it contacts lower snap ring.
BODY INSTALLATION BODYASSEMBLY 5/16” x 1 1/4” (2) Retalnlng Ring Flow Through Bearing screw I output Shaft FIG. 75 FIG. 76 Install output bearing. Position bearing on body and press on outer bearing race to bottom position in body. IMPORTANT: When removing rubber hand make sure Install bearing retaining ring. Install output shaft. This is a press fit. Be sure to support inner race of ball bearing while pressing shaft into bearing. IMPORTANT: Be sure output shaft rotates freelyby hand.
TRANSAXLE -29
TRANSAXLE Description Item t 1 TransaxleComplete 2 Case-Transaxle RH 3 Case-Transaxle LH 4 Bearing Ball 5 Bearing Needle 6 Needle Bearing 7 Bearing Needle 8 Bearing Needle 9 Seal Axle 10 Seal 11 Dowel Pin Differential End Cap 12 13 Differential Ring Gear 43 Tooth 14 Differential Pinion Gear 11 Tooth 15 Special Washer-Case Hardened 16 Bolt 3/8-16 X 31/2 Grade 8 17 Nut 3/8-16 High-Tensile 18 Rear AxleRH-Long (13 1/8 in.) 19 Rear AxleLH-Short (10 1/8 in.
TRANSMISSION AND FILTER 31
TRANSMISSION AND FILTER Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Description Pump & Motor Gear 22 Tooth Spacer-Drive Gear Snapring Gasket Bolt 3/8-16 X 5 Bolt 3/8-16 X 21/2 Eslok Bolt 3/8-16 X 6 1/2 Nut 3/8-16 Eslok ControlPlate CamFollower Arm Woodruff Key 1/8 X 5/8 Washer 1/2 SAE Nut 1/2 Eslok Spacer (Long) Spacer (Short) Washer-SpringDisc Washer-Friction Cam-Speed Control Spacer Nut 3/8-16 Conelock EccentricCam Bolt 5/16-18 X 1 Eslo
MOTION CONTROL,CLUTCHLINKAGE 9 33
MOTION CONTROL,CLUTCHLINKAGE Item Description SpecialBolt 3/8-16 X 1 1/2 Knob Knob Screw #10-24 X 1 1/4 Handle Washer 1/2 SAE Bushing Bolt 1 /4-20 x 1 1/2 Washer 1/4 SAE Nut 1/4-28 1 1 1 1 1 1 1 2 2 1
BRAKE AND LINKAGE SINGLE ACTION BRAKE BAND -35-
BRAKE AND LINKAGE SINGLE ACTION BRAKE BAND Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Description Brake/Return To NeutralPedal Bushing Collar 1/4-20 X 1/4 Cup Pt SetScrew Spacer Spring-BrakeReturn Brake Rod-Front CotterPin 1/8 X 1 E.S. Nut 3 / 8 - 1 6 . .
BRAKE AND LINKAGE DUAL ACTION BRAKE BAND 24 -37-
BRAKE AND LINKAGE DUAL ACTION BRAKE BAND ITEM 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
EATON MODEL 11 TRANSMISSION i ITEM # PART # 1 2 3 4 5 6 7 8 9 10 11 12 1 12635 1 12636 1 12604 1 12637 1 12654 1 12638 1 12639 1 12640 1 12641 1 12595 13.
ITEM # PART # DESCRIPTION QTY.
