Part of the Case IH Repair Manuals.
All 764 pages of this Case IH DX31, DX34 Repair Manual (OEM #87535066) are built around one job: getting your DX31 or DX34 tractor back to factory condition. Inside, you get full wiring diagrams covering the battery, key switch, relays, alternator, and safety start circuit, plus hydraulic schematics tracing every valve, pump, and lift cylinder through the system. A thorough troubleshooting section and page after page of torque specs cover everything from the engine block to the hydrostatic transmission. Replace the clutch disc when it drops below 7.2 mm (down from the 3.2 mm factory spec), and torque the hydraulic pump cover bolts to 22–28 N·m. Your machine is down. Pull up this bookmarked PDF on any device, search the spec you need, and get back to wrenching.
Complete the set for your DX31, DX34
- Operator Manual: Case IH DX31, DX34 Operator Manual (incl. Wiring)
What's Inside This Case IH DX31, DX34 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 39-66 | Precautionary Statements, Personal Safety, Machine Safety, Information, Safety (Precautionary Statements, Tractor, Servicing the Tractor) |
| Engine | 67-188 | Engine Bolt Torque Specifications, Cylinder Head and Valve Train Components, Cylinder Block Assembly, Fuel Injector and Glow Plug, Oil Pump, Cooling System |
| Clutch | 189-210 | Single Clutch, HST Transmission, Double Clutch, PTO Clutch, Clutch Pilot Bearing, Clutch Release Bearing |
| Gear Transmission | 211-258 | Powerflow, Initial Power Flow -- Transmission Input, Initial Power Flow -- PTO Input, FWD Power Flow, Shift Rails, Transmission Differential |
| FWD Axle | 259-282 | Front to Rear Axle Ratio, Front Axle and Differential, Drive Pinion, Differential Gear, Reduction Gear -- Drop Box, Steering Stops |
| Differential, Rear Axle | 283-306 | Differential Assembly, Differential Lock, Drive Pinion, Rear Axle, Ring Gear and Pinion Gear Pattern Specification and Adjustment |
| Hydrostatic Transmission | 307-380 | Variable Displacement Pump, Fixed Displacement Motor, HST Charge Circuit, Hydrostatic Gearbox, Port Block -- Neutral and Feed Valves, High Pressure Relief Valve |
| Power Take-Off Systems | 381-398 | Live Power Take-Off, Power Take-Off Drive -- Hydrostatic Transmission, Output Shaft, Rear Countershaft, Front Countershaft, Mid-Mount Power Take-Off |
| Brakes | 399-410 | Parking Brake, Overhaul, Brake Adjustment |
| Hydraulic System | 411-466 | Hydraulic Pump, Hydraulic Fluid Filter, Combination System Relief - Diverter Valve Manifold, Control Valve (Hpl), Lift Cylinder, Remote Valves |
| Steering Systems | 467-514 | Power-Steering Control Motor, Power Steering Pump, FWD Steering Cylinder, Steering Column, Steering Stops |
| Wheels and Tires | 515-522 | FWD Tread Setting, Rear Axle Tread Setting, Tractor Weighting, Rear Wheel Weight Installation, Liquid Ballast, Tire Pressure |
| Electrical System | 523-738 | Battery and Fuses, Key Switch, Relays, Alternator, Starter Motor, Safety Start Circuit |
| Platform | 739-764 | Hood, Dash Console, Seat, ROPS, Fenders, PTO and Range Controls |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic pump service parts | Only shaft seal and internal O rings are serviceable. If troubleshooting indicates a faulty pump, replace the pump with a new assembly. | p. 447 |
| Hydraulic pump cover retaining bolts torque | 22 – 28 N⋅m (16 – 20 ft. lbs.) | p. 448 |
| Clutch Disc Thickness | 8.0 mm (0.315″) | p. 192 |
| Clutch Disc Thickness Allowable Limit | 7.2 mm (0.28″) | p. 192 |
| Oil filter replacement interval | Every 100 hours of operation | p. 132 |
| Lift Cylinder Diameter | 70 mm (2.76″) | p. 414 |
| Piston-to-Tube Clearance | 0.7 mm (0.027 in.) max. | p. 469 |
| Troubleshooting: Implement fails to lift when lever is in raised position (Possible Causes & Remedies) | Possible Causes: Linkage out of adjustment, Relief valve setting too low, Faulty safety valve, O ring failure on control valve body to cover, Excessive fluid leakage past lift cylinder piston seal, Restricted suction filter, Unload valve does not close, Lowering valve remains open. Remedies: Adjust external and internal linkage, Perform system relief valve pressure test, Repair or replace safety valve, Repair as required, Replace seal, piston, or cylinder as required, Clean or replace as required, Check unload valve operation, Check lowering valve adjustment and operation. | p. 428 |
| Fuel Tank Capacity | 27.6 liters/7.3 U.S. gals. | p. 52 |
| Engine Crankcase Capacity (With Filter) | 4.0 liters/4.2 U.S. qts. | p. 52 |
| Radiator Cap Pressure | 0.9 bar (13 PSI) | p. 79 |
| Clutch Pedal Free-Travel | 19 -- 30 mm (3/4 -- 1-3/16″) | p. 81 |
