Packed into 768 pages, this Farmall 31, Farmall 35 Repair Manual (OEM #84132127) covers both compact tractors across 14 systems: engine, hydrostatic transmission, hydraulics, steering, brakes, and a full electrical chapter. Inside: wiring diagrams tracing circuits from the battery through the key switch, safety switches, and alternator; hydraulic schematics for the lift cylinder, remote valves, and diverter manifold; plus troubleshooting organized by symptom across engine, clutch, and hydraulic faults. You also get page after page of torque tables, step-by-step overhaul procedures for the hydrostatic pump and motor, and exploded views of the FWD front axle and rear differential. Set connecting rod cap nuts to 49-54 N·m (36-40 ft-lbs), then dial clutch pedal free-play to 19-30 mm before the machine leaves your shop. Your dealer wants two weeks. Grab this PDF, search any spec by keyword, and get back to work.
What's Inside This Farmall FARMALL 31, FARMALL 35 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 41-68 | Precautionary Statements (Personal Safety, Machine Safety, Information), Safety (Precautionary Statements, Tractor) |
| Engine | 69-190 | Specifications, Troubleshooting, Cylinder Head, Valve Train Components, Fuel System, Cooling System |
| Clutch | 191-212 | Troubleshooting, Specifications, Single Clutch, Double Clutch, Adjustments, Overhaul |
| Gear Transmission | 213-260 | Specifications, Description of Operation, Disassembly, Overhaul, Main Gear Shifter Rod, Double Clutch Input Shaft |
| FWD Front Axle | 261-284 | Specifications, Troubleshooting, Overhaul, Reduction Gear - Drop Box, Front Axle and Differential, Ring Gear-To-Pinion Backlash Check and Adjustment |
| Differential, Rear | 285-308 | Specifications, Ring Gear and Pinion Gear Pattern Specification and Adjustment, Differential Lock, Overhaul - Differential Assembly, Disassembly, Rear Axle |
| Hydrostatic Transmission | 309-382 | Specifications, Troubleshooting, Description of Operation, Overhaul, Hydrostatic Pump, Hydrostatic Motor, Adjustments |
| Power Take-Off Systems | 383-400 | Specifications, Description of Operation, Overhaul, Output Shaft, Countershaft, Shifter |
| Brakes | 401-412 | Specifications, Description of Operation, Parking Brake, Overhaul, Removal, Inspection, Assembly, Brake Adjustment |
| Hydraulic System | 413-468 | Hydraulic Fluid Filter, Combination System Relief - Diverter Valve Manifold, Control Valve (Hpl), Hydraulic Pump, Remote Valves, Lift Cylinder |
| Steering Systems | 469-516 | Power-Steering Control Motor, Gerotor Pump, Power Steering Pump, FWD Power Steering Cylinder, Steering Column, Adjustable Steering Column |
| Wheels and Tires | 517-524 | FWD Tread Setting, Rear Axle Tread Setting, Tractor Weighting, Rear Wheel Weight Installation, Liquid Ballast, Tire Pressure |
| Electrical System | 525-742 | Battery and Fuses, Key Switch, Safety Switches, Engine Sensors, Alternator, Starter |
| Platform | 743-768 | Hood, Rear Hood Panels, Dash Console, Seat, ROPS, Fenders |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Connecting Rod Cap Nuts Torque | 49 - 54 N·m (36 - 40 ft-lbs) | p. 82 |
| Clutch Pedal Free-Play | 19 - 30 mm (3/4 - 1-3/16 in) | p. 194 |
| Troubleshooting: Implement fails to lift when lever is in raised position (Remedy) | Adjust external and internal linkage | p. 430 |
| Troubleshooting: Engine overheats (Remedy) | Fill coolant to proper level | p. 90 |
| Front Agricultural Tire (7-14, 4PR, R1) Inflation Pressure | 0.6-1.8 bar (8-26 psi) | p. 67 |
Farmall FARMALL 31, FARMALL 35 Common Problems This Manual Covers
Farmall 31 clutch pedal lacks resistance and transmission fails to engage smoothly under heavy load. p. 194
Measure the pedal clearance before adjusting the linkage. Verify the clutch pedal free-play is exactly 19 - 30 mm (0.75 - 1.18 in) as shown on page 194. Adjust the turnbuckle until the correct specification is reached, then tighten the locknut.
Manual Section: Clutch TroubleshootingEngine knocks heavily under load and exhibits low oil pressure during normal operating temperatures. p. 82
Remove the oil pan and inspect the bearings for excessive wear. Replace damaged bearings and reinstall the caps. Torque the connecting rod cap nuts to 49 - 54 N·m (36 - 40 ft-lbs) as specified on page 82. Verify the oil pump pickup tube is completely clean.
Manual Section: Engine TroubleshootingFront wheel shimmy and erratic steering response when driving the tractor on hard flat surfaces. p. 67
Check the front agricultural tire inflation pressure before adjusting the steering cylinder or internal linkages. Inflate the tires to exactly 0.6-1.8 bar (8-26 psi) as detailed on page 67. Inspect the tie rod ends and wheel bearings for excessive mechanical play.
Manual Section: FWD Front Axle TroubleshootingFrequently Asked Questions
How do I adjust the clutch pedal free-play on a Farmall 31 or 35?
The repair manual specifies clutch pedal free-play of 19 to 30 mm (0.75 to 1.18 in) as shown in the Clutch section on page 194. To adjust, locate the turnbuckle on the clutch linkage rod and rotate it until the measured clearance falls within that range, then tighten the locknut. If correct free-play does not resolve slipping under heavy load, inspect the clutch disc and pressure plate for wear beyond service limits before reassembly.
What is the connecting rod cap nut torque spec for the Farmall 31 or 35 engine?
Torque the connecting rod cap nuts to 49 to 54 N.m (36 to 40 ft-lbs) as listed in the Engine Specifications table on page 82. Before final assembly, inspect each bearing shell and crankshaft journal surface for scoring or wear. Clean the oil pump pickup tube completely and verify oil pressure returns to normal before replacing the oil pan.
Why won't the hydraulic lift raise an implement on my Farmall 31 or 35?
The hydraulic system troubleshooting table on page 430 lists linkage out of adjustment as the primary cause when the control lever is in the raised position but the implement fails to move. The specified remedy is to adjust both the external and internal linkage. Also check the hydraulic fluid level and inspect the system relief valve setting before disassembling the hydraulic pump or lift cylinder.
What should I check first if my Farmall 31 or 35 engine overheats?
Page 90 of the Engine Troubleshooting section identifies insufficient coolant in the radiator as a primary cause of engine overheating. Fill the radiator to the proper level and inspect hose connections and the water pump for leaks. The radiator cap is rated at 0.9 bar (13 psi), so pressure-test it and replace it if it fails to hold. Also check fan belt tension and verify the thermostat opens correctly as covered in the Engine Cooling System section.
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