Part of the Case Repair Manuals.
Need the exact hydrostatic service procedures for your Case 544, 656, H70, or H80 tractor? This 116-page Service Manual (OEM #GSS-1397) covers the H70 and H80 hydrostatic drive systems along with special service tools, standard torque data for nuts and bolts, and full machine specifications. You get hydraulic system coverage and step-by-step repair data for the whole tractor. Note this is a specifications and service manual and does not include wiring diagrams. Stop guessing at torque values and pull the factory numbers straight from the source.
What's Inside This Case 544, 656, H70, H80 Manual
| System | Pages | Key Topics |
|---|---|---|
| Special Service Tools Required | 6 | Fes Tools, Otc Tools, Gauges Required, Fes 123 Hydrostatic Tractor Tool Kit |
| Standard Torque Data for Nuts and Bolts | 7 | Recommended Torque Data Introduction, Standard Torque Data Table, Torque Multipliers Note, Bolt Type Identification Chart |
| Specifications | 8-10 | Pressures, Pump Capacities, Bearing Fits, Tolerances, Spring Specifications, Special Torques, Valves |
| Principles of Hydrostatics | 11-16 | General, How It Works (Variable Displacement Pump and Variable Displacement Motor), Servo Cylinders, Center Section |
| Operating Principles | 17-20 | Hand Controlled Models (Neutral, Forward, Reverse), Foot Controlled Models (Neutral |
| Familiarization and Component Identification | 21-24 | Hydrostatic Components Front View, Hydrostatic Components Right Rear View, Hydrostatic Components Left Rear View, Motor Side of Center Section, Pump Side of Center Section |
| Controlling the Tractor | 25-30 | 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) |
| Unit Service | 31-63 | Hydrostatic Transmission Removal (Front End Split, Fuel Tank and Steering Support Removal, Transmission Housing Removal) |
| Servicing Components | 64-74 | Servo Cylinders (Removal, Disassembly, Inspection, Reassembly), Charge and Servo Pump (Servo Relief Valve Improvements, Removal, Reassembly, Inspection) |
| Range Transmission and Mph Drive | 75 | Range Transmission Overview, Mph Drive Cable Disconnection, Mph Drive Cable Removal |
| Hydraulic and Differential Lubrication Circuits | 76 | Hydrostatic Tractor Differences, Hitch Pump Supply, Oil Cooler Connection, Differential Lube Flow, Manual Steering Make-Up Oil, Power Steering Relief Valve, System Oil Level Check |
| Adjustments | 77-83 | Hand Controlled Models (Neutral Adjustment for Servo Control and Linkage, Foot-N-Inch Valve Adjustment, Drive Control Valve Adjustment, S-R Lever Assembly Neutral Adjustment) |
| Testing and Trouble Shooting | 84-101 | 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 |
| Safety Starting Procedure | 102-116 | Operating Temperatures, Safety Starting Procedure Caution, Safety Starting Procedure Steps |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Pump cylinder block spring free length | 1-9/32 inches | p. 9 |
| Pump cylinder block spring total number of coils | 3-1/2 | p. 9 |
| Hydraulic filter replacement interval (second change) | 100 hours | p. 63 |
| Hydraulic filter replacement interval (each change thereafter) | 250 hours | p. 63 |
