Wheel Horse Tractor Hydrostatic Transmission Service Manual
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PAGES:69
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Wheel Horse Tractor Hydrostatic Transmission Service Manual
FOREWORD:
- This service and repair manual has been compiled to provide authorized Wheel Horse service personnel with the proper procedures and techniques for servicing Wheel Horse automatic transmissions. The following index lists all areas covered.
- It is advisable to read all of the introductory sections first to gain a proper understanding of the Wheel Horse automatic transmission. The automatic transmission is a sophisticated piece of machinery. Maintain strict cleanliness control during all stages of service and repair.
- Even a small amount of dirt or other contamination can severely damage the system. Although this manual deals primarily with the Sundstrand pistonpiston type hydrostatic transmission, service and repair procedures for the older hydrogear type transmission have beeo included in a separate section.
INTRODUCTION
The following information will assist you with troubleshooting, assembly, and repair information, in light of changes made and experience gained since this manual was first published in 1974. It also contains special service information for 1978-82 model year Sundstrand units.
SERVICE AND REPAIR PARTS
• Hydrogear Conversions – Many hydrogear units (1966 to mid-1973) have been converted to the serviceable piston-piston transmission. Refer to the photos in this manual to identify the transmission in a particular tractor.
• Complete Transmissions – Complete replacement transmission assemblies are no longer available. Independent outside rebuilding service many be available. Refer to the latest issue of Service
Bulletin 437 for information.
• Repair Parts – Use this manual to determine replacement part numbers for 1965 to mid-1973 hydrogear units (Pages 54-56) and mid-1973 to 1977 piston-piston units (Pages 60-62). Be sure to
check parts price list to determine if all parts needed are still available before ordering parts. Piston-piston part numbers for 1978-82 model year tractors are contained in the particular tractor parts manual.
• D-Series Adjustments – Transmission control linkage adjustments described in this manual for 1975 models are appropriate for 1976- 77 models. 1978-82 linkage adjustments are covered in the 1978-79 B,C,D- Series Service Manual, PIN 810063R1.
• D-Series Driven Coupling Preload and Pump Alignment – Refer to Service Bulletins 217 and 305 for special service information . CONSTRUCTION CHANGES, 1978 AND LATER
• Sundstrand units on 1978 and later tractors differ from earlier units in that the motor shaft extends through the cover plate, for the mounting of a parking brake drum. Motor repair operations described in this manual still apply, except that the motor cover plate oil seal should be replaced during the repair process.
TABLE OF CONTENTS:
Wheel Horse Tractor Hydrostatic Transmission Service Manual
SUPPLEMENTAL INFORMATION
INTRODUCTION
SERVICE AND REPAIR PARTS
CONSTRUCTION CHANGES, 1978 AND LATER
SERVICE NOTES
SPECIAL ASSEMBLY NOTE
FOREWORD
PRINCIPLES OF OPERATION
RELIEF VALVES
FORWARD TRAVEL
REVERSE TRAVEL
ACCELERATION VALVES
PUSH VALVE
DIAGNOSIS
TROUBLE-SHOOTING CHARTS
ENGINE CHART
SPEED CONTROL LINKAGE AND ADJUSTMENTS–STANDARD SYSTEM
NEUTRAL ADJUSTMENT
FRICTION ADJUSTMENT
SPEED CONTROL LINKAGE AND ADJUSTMENTS—SEPARATED SYSTEM
1973 18 HP AUTOMATIC–NEUTRAL ADJUSTMENT
FRICTION ADJUSTMENT
PARKING BRAKE ADJUSTMENT
1974 “D” SERIES TRACTORS–NEUTRAL ADJUSTMENT (FIG. 8)
LEVER POSITION ADJUSTMENT
FRICTION ADJUSTMENT — SPEED CONTROL LEVER
FRICTION ADJUSTMENT–PARKING BRAKE
PARKING BRAKE ADJUSTMENT
1975 “D” SERIES TRACTORS — NEUTRAL ADJUSTMENT
LEVER FRICTION ADJUSTMENT
PARKING BRAKE ADJUSTMENT
PRESSURE TESTING
CHARGE PRESSURE TEST
IMPLEMENT PRESSURE TEST
REPAIR PROCEDURES –
SEPARATION OF PUMP AND MOTOR
SEAL RING INSTALLATION & ASSEMBLY OF PUMP TO MOTOR
SUNDSTRAND HYDROSTATIC TRANSMISSION MANUAL
Table of Contents – Page 2 of 3
REMOVAL OF HYDROSTATIC UNIT FROM A STANDARD SYSTEM
INSTALLATION OF HYDROSTATIC UNIT IN A STANDARD SYSTEM
REMOVAL OF HYDROSTATIC UNIT FROM A SEPARATED SYSTEM
MOTOR REMOVAL
PUMP REMOVAL
INSTALLATION OF HYDROSTATIC UNIT IN A SEPARATED
PUMP INSTALLATION
MANIFOLD INSTALLATION
MOTOR INSTALLATION
INSPECTION OF PARTS
PUMP AND MOTOR SHAFTS
CYLINDER BLOCK ASSEMBLIES–GENERAL
CYLINDER BLOCK FACE
PISTONS AND SLIPPERS
SLIPPER RETAINERS
VALVE PLATES
THRUST PLATES
CHARGE PUMP ASSEMBLY
BEARINGS (FOR REPLACEMENT SEE DISASSEMBLY AND ASSEMBLY SECTION)
DISASSEMBLY & ASSEMBLY OF HYDROSTATIC PUMP
PUMP HOUSING DISASSEMBLY & ASSEMBLY
DISASSEMBLY
ASSEMBLY OF PUMP HOUSING
ASSEMBLY OF PUMP SECTION
REMOVAL & REPLACEMENT OF ACCELERATION VALVES
DISASSEMBLY
ASSEMBLY
DISASSEMBLY AND ASSEMBLY OF HYDROSTATIC MOTOR
DISASSEMBLY OF MOTOR
ASSEMBLY OF MOTOR
DISASSEMBLY AND ASSEMBLY OF CYLINDER BLOCKS AND PISTON ASSEMBLIES
DISASSEMBLY
ASSEMBLY
SUNDSTRAND HYDROSTATIC TRANSMISSION MANUAL
Table of Contents – Page 3 of 3
HYDROGEAR SECTION
HYDROGEAR TROUBLE-SHOOTING CHART
TROUBLE SHOOTING GUIDE
PRELIMINARY CHECKS
HYDROGEAR TUNE-UP
HYDROGEAR SERVICE NOTE
HYDROGEAR
HYDROGEAR PARTS DRAWING/LIST 1965-73
PUMP SHAFT SEAL REPLACEMENT
THE TRANSAXLE
REMOVAL OF TRANSAXLE COMPLETE WITH HYDROSTATIC UNIT
REMOVAL OF HYDROSTATIC UNIT FROM THE TRANSAXLE
TRANSAXLE DISASSEMBLY
PARKING BRAKE AND OIL FILTER
TRANSAXLE GASKET INSTALLATION
PISTON-PISTON HYDROSTATIC TRANSMISSION 1973-1977
SERVICE BULLETIN RECORD
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