Description
This International Harvester Tractor Hydrostactic Transmission Service Manual is a reproduction of the original, out of print, manual. This book provides detailed service information, step-by-step repair instruction and maintenance specifications for the following International Harvester Hydrostactic Transmissions:
3444 TLB G&D Hydro Trans
70 Hydro, Trans
86 Hydro, Trans
544 (RC) G&D Hydrostatic Drive Only
544 Utility HydroTrans Only
656 Hydro Trans
Hydrostactic Trans: 544,656,70,86,666
Table of Contents
Special Service Tools Required
Standard Torque Data for Nuts and Bolts
Specifications
Speed Ratio Charts
Principles of Hydrostatics
General
How It Works
Variable Displacement Pump and Variable Displacement Motor
Servo Cylinders
Center Section
Operating Principles
Hand Controlled Models
Neutral
Forward (Tractor Moving Forward)
Reverse (Tractor Moving Rearward)
Forward (Tractor Decelerating)
Foot Controlled Models
Neutral
Forward
Reverse
Forward (Tractor Decelerating)
Familiarization and Component Identification
Controlling the Tractor (Hand Controlled Models)
High-Low Range Selector
Speed-Ratio Control
Foot-N-Inch Valve and Drive Control Valve
Foot-N-Inch Valve
Drive Control Valve
Controlling the Tractor (Foot Controlled Models)
General
Dump Valve
Two Position Deceleration Valve
Controls
Unit Service
Hydrostatic Transmission
Removal
Disassembly
Cleaning Inspection and Repair
Reassembly
Flex Plate Installation
Clean Up of Entire Hydraulic System and Power Train
Servicing Components
Servo Cylinders
Removal
Disassembly
Inspection
Reassembly
Charge and Servo Pump
Servo Relief Valve Improvements
Removal
Disassembly
Inspection
Reassembly
Center Section Components
Check Valves, High Pressure Relief Valves and Shuttle Valve
Importance of Proper Torque on High Pressure Relief Valves
Replacing Relief Valves
Replacing Check Valves
Replacing Shuttle Valve
Multiple Valve Body
Drive Control Valve
Removal (F-Models)
Removal (I-Models)
Service
Foot-N-Inch Valve
Range Transmission and MPH Drive
Hydraulic and Differential Lubrication Circuits
Adjustments
Hand Controlled Models
Neutral Adjustment for Servo Control and Linkage
Foot-N-Inch Valve
Drive Control Valve
Safety Start Switch (F-Models)
Safety Start Switch (I-Models)
Foot Controlled Models
Adjusting for Neutral
Pedal Adjustments
Dump Valve and Safety Starting Switch
Two Position Deceleration Valve
Testing and Trouble Shooting
General Information
Importance of Excluding Air
Symptoms of an Aerated System
Step by Step Check for Causes of Air Leaks
Checking Pressures and Charge Pump Flow
General
Method of Checking Drive Pressure
Charge Pump Pressure and Flow
Charge Pump Flow Used in Trouble Shooting
Servo Pump Pressure
Deceleration Pressure (Hand Control)
Testing Other Components
Checking Time Delay of Anti-Coast Valve
Drive Control Valve
Drive Control and Foot-N-Inch Valve Checking by Elimination
Trouble Shooting
General Information
Safety Starting Procedure
