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 John Deere 840 to 1140 Series 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 |
|---|---|---|
| Fuel system | 00-5 | p. 5 |
| Hydraulic pumps | 00-15 | p. 19 |
| Front axle | 00-15 | p. 19 |
| Transmission indicator light glows only when there is a malfunction | only when there is a malfunction | p. 27 |
| Fast idle speed: Tractors 840 and 940 | 2560 rpm | p. 32 |
| Hydraulic pump filter screen cleaning interval | Every 1000 operating hours | p. 42 |
| 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: Number of cylinders | 3 | p. 7 |
John Deere 840 to 1140 Series Common Problems This Manual Covers
John Deere 1040 power steering feels loose or fails completely when turning at low engine RPM
Remove the valve housing cover and inspect the crosshaft arm splines for wear where they meet the shaft. Check clearance between the operating sleeve and special washer; page 561 lists 0.03 to 0.07 mm as the spec. Anything looser means the splines have worked loose; replace the arm and torque the retaining nut evenly before road testing.
Manual Section: Steering System Diagnosing Malfunctions p. 561Complete loss of power steering assist while driving straight, wheel spins freely with no resistance
Test the steering system per the diagnosing malfunctions procedures; sluggish or dead steering on three-cylinder models often traces to front axle misalignment rather than the hydraulic circuit. Inspect the valve housing spacer bushing height, spec'd on page 544 at 8.51 to 8.77 mm, and check front axle pivot pins for wear before condemning the pump.
Manual Section: Steering System Diagnosing Malfunctions p. 544Noticeable power loss under heavy load with black smoke from the exhaust
Pull the fuel injection pump filter and inspect for contamination; change it every 500 hours per page 41. Bench test nozzle opening pressure against spec, 21700 to 22500 kPa (217 to 225 bar) for new or reconditioned nozzles per page 179. Weak or dribbling nozzles cause the smoke and power loss; replace any below spec.
Manual Section: Fuel and Air Intake System Diagnosing Malfunctions p. 179Bucket or rockshaft lifts slowly, and hydraulic pump squeals loudly under load conditions
Clean the pump inlet filter screen; service it every 1000 operating hours per page 42. Check standby pressure at the test port; spec is 19000 kPa (190 bar, 2760 psi) per page 12. If it still squeals, pull the housing and measure the shaft oil seal bore against page 595's 38.05 to 38.10 mm spec, then replace worn seals.
Manual Section: Hydraulic System Diagnosing Malfunctions and Tests p. 42Front end wanders or clunks over bumps, excessive play in the wheel spindles
Jack up the front end and check spindle end play by hand; spec on the standard front axle is 0.76 mm (0.03 in.) per page 730. If play exceeds that, torque cap screw 31 to 120 Nm (85 ft-lb) and recheck. Replace worn pivot bushings before they let the axle rock side to side.
Manual Section: Miscellaneous - Front Axle p. 730Frequently Asked Questions
What are the torque specifications for the engine head bolts on John Deere 1040?
The cylinder head cap screws should be tightened to 130 Nm (95 ft-lb) torque. This procedure involves first loosening them by 5 to 10 degrees before the final tightening. Use torque wrench adapter JD-307 when tightening the cylinder head cap screws. p. 89
What is the engine oil capacity for John Deere 840, 940, 1040, and 1140 tractors?
The engine crankcase capacity is 6.5 liters (1.7 U.S. gals.) without a filter change and 7.0 liters (1.8 U.S. gals.) with a filter change. This information is crucial for proper lubrication and maintenance of the engine. p. 15
What are the valve clearance specifications for the engine on John Deere 840, 940, 1040, and 1140 tractors?
The intake valve clearance should be 0.35 mm (0.014 in.), and the exhaust valve clearance should be 0.45 mm (0.018 in.). These clearances apply whether the engine is hot or cold and are important for proper engine tune-up. p. 111
What is the PTO horsepower for the John Deere 1040 tractor according to DIN 70020 at 2500 rpm rated engine speed?
The PTO horsepower for the John Deere 1040 tractor is 33 kW (45 hp) when measured according to DIN 70020 at 2500 rpm rated engine speed. This specification is for tractors with the engine run in (above 100 hours of operation) and at operating temperature. p. 49
What do I get after purchasing this John Deere 840, 940, 1040, 1140 manual?
You get a 774-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print specific sections of this John Deere 840, 940, 1040, 1140 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this John Deere 840, 940, 1040, 1140 manual have electrical diagrams?
Yes, an electrical wiring diagram is included to help trace the main circuits.
