Part of the John Deere Repair Manuals.
This 774-page John Deere Technical Manual (OEM #TM4353) covers the 840, 940, 1040, and 1140 tractors, and it doesn't stop at surface-level checks. Open it and you get complete wiring diagrams for every harness on the machine, hydraulic schematics for the rockshaft and Power Train circuits, and a full troubleshooting section for diagnosing malfunctions across the fuel system, electrical system, and hydraulics. You also get specifications, torque tables, and fluid capacities for every major system: engine, steering, brakes, hydraulic pumps. Fast idle speed on the 840 and 940 is specced at 2560 rpm; the transmission indicator light is built to glow only when there's an actual malfunction, not just noise. Your multimeter and a hunch shouldn't be the diagnostic tool of last resort. This PDF is bookmarked and searchable by keyword, so you can jump straight from cylinder head torque to hydraulic pump seal clearance without flipping through 774 pages by hand.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 7-76 | Specifications and Special Tools (Serial Numbers, Model Numbers, Engine, Engine Clutch, Cooling System) |
| Engine | 77-176 | Specifications and Special Tools, General Information, Diagnosing Malfunctions, Cylinder Head, Valves and Camshaft, Cylinder Block, Liners, Pistons and Connecting Rods |
| Fuel and Air Intake System | 177-224 | Specifications and Special Tools, General Information, Diagnosing Malfunctions, Fuel Tank, Water Trap, Fuel Transfer Pumps and Fuel Filter, Roto Diesel Fuel Injection Pump |
| Electrical System | 225-312 | Specifications and Special Tools, Description and Diagnosing Malfunctions, Wiring Harnesses, Controls and Instruments, Lighting Systems, Wiring Diagrams, Starting Motor, Alternator |
| Power Train | 313-539 | Specifications and Special Tools, Description, Operation and Lubricating System, Clutch Operating Linkage, Engine Clutches, Hi-Lo Shift Unit, Creeper Transmission |
| Steering System and Brakes | 540-590 | Specifications and Special Tools, Power Steering, Manual Steering, Brakes |
| Hydraulic System | 591-719 | Specifications and Special Tools, Description, Diagnosing Malfunctions and Tests, Oil Reservoir, Filter, Valves and Oil Cooler, Hydraulic Pumps, Rockshaft |
| Miscellaneous | 720-747 | Specifications, Front Axle, Belt Pulley, Front and Rear Wheels, Axle Trailer Hitch |
| Operator's Cab | 748-774 | Specifications, Ventilation and Heating, Operator's Seats, Roll Guard |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fast idle speed: Tractors 840 and 940 | 2560 rpm | p. 32 |
| Clutch fork attaching screws torque | 50 Nm (35 ft-lb) | p. 358 |
| Clearance between special washer and operating sleeve in valve housing assembly | 0.03 to 0.07 mm | p. 544 |
| Height of spacer bushing | 8.51 to 8.77 mm | p. 544 |
| Clearance between operating sleeve and special washer | 0.03 to 0.07 mm (0.0012 to 0.0027 in.) | p. 561 |
| Axle center to front axle carrier, slotted nut* | 300 Nm | p. 14 |
| Engine: Displacement | 2940 cm3 (179 cu.in.) | p. 7 |
| Engine: Maximum torque (840 at 1300 rpm) | 135 Nm (100 ft-lb) | p. 7 |
| Engine: Valve clearance (Intake valve) | 0.35 mm (0.014 in.) | p. 7 |
| Engine: Slow idle speed | 800 rpm | p. 8 |
| Cooling System: Thermostat opens at | 82° C (180° F) | p. 16 |
| Fuel System: Nozzle opening pressure (new/reconditioned) | 21700 to 22500 kPa (217 to 225 bar; 3150 to 3250 psi) | p. 179 |
