Part of the John Deere Repair Manuals.
Need factory answers for your John Deere 3040 or 3140? This 1373-page John Deere 3040, 3140 Technical Manual PDF (OEM #TM4379) tears into both tractors front to rear, from the diesel engine to the SG2 cab. You get complete wiring diagrams for the electrical system, hydraulic schematics with pressure test procedures, and page after page of torque tables and rebuild steps for the Hi-Lo shift unit, creeper transmission, and hydrostatic steering. Fill the crankcase with 11 liters of oil (11.5 with a filter change) and plan on 68.0 liters dry for the transmission and hydraulic system. Swap that trans-hydraulic filter at the first 50 hours, again at 500, then every 500 after. These tractors outlived their dealer support; the specs live here now. Multi-level bookmarks jump you straight to any system, and the PDF opens on any laptop, tablet, or phone in the shop.
What's Inside This John Deere 3040, 3140 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 5-194 | Specifications and Special Tools, Predelivery, Delivery and After-Sales Inspections, Lubrication and Service, Tune-Up |
| Engine | 195-298 | Specifications, Radiator |
| Fuel and Air Intake System | 299-360 | Specifications and Special Tools, Diagnosing Malfunctions, Fuel Tank and Water Trap, Cold Weather Starting Aids, Speed Control Linkage, Air Cleaner |
| Electrical System | 361-582 | Specifications and Special Tools, Description, Diagnosing Malfunctions and Tests, Wiring Harnesses, Controls and Instruments, Lighting Systems, Wiring Diagrams, Starting Motor |
| Power Train | 583-858 | Specifications and Special Tools, Description, Operation and Lubricating System, Clutch Operating Linkages, Engine Clutches, Hi-Lo Shift Unit, Creeper Transmission |
| Steering System and Brakes | 859-994 | Specifications and Special Tools, Hydrostatic Steering, Brakes |
| Hydraulic System | 995-1224 | Specifications and Special Tools, Description, Diagnosing Malfunctions and Pressure Tests, Oil Reservoir, Filter, Valves and Oil Cooler, Hydraulic Pumps, Rockshaft |
| Miscellaneous | 1225-1252 | Specifications, Front Axle, Belt Pulley, Front and Rear Wheels, Axle Trailer Hitch, Trailer Hitch (Height Adjustable) |
| Operator's Cabs | 1253-1373 | Specifications and Special Tools, Air Conditioning System, Ventilation and Heating, Operator's Seats, Opu Cab, SG2 Cab, Roll Guard |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Description, diagnosing malfunctions and pressure tests | Description, diagnosing malfunctions and pressure tests | p. 4 |
| Transmission/Hydraulic Oil Filter Service Interval | After the first 50, after the first 500 and thereafter every 500 hours of operation. | p. 49 |
| Engine oil and crankcase filter element replacement interval | After the first 100 and 200 hours of operation. Thereafter replace filter element and change engine oil after every 200 hours of operation. | p. 46 |
| Engine crankcase capacity without filter change | 11 liters (2.9 U.S.gal.) | p. 46 |
| Transmission/hydraulic system dry capacity without increased lifting capacity | 68.0 liters (18.00 U.S.gal.) | p. 46 |
| Transmission/hydraulic system dry capacity with increased lifting capacity | 55.0 liters (14.5 U.S.gal.) | p. 46 |
| Gear shift cover to clutch hsg., cap screws | 50 Nm (35 ft-lb) | p. 111 |
| Clutch housing to transmission case, cap screws | 160 Nm | p. 593 |
| Flywheel to crankshaft, cap screws | 160 Nm | p. 590 |
| Oil lines leaking | Tighten lines or replace | p. 1028 |
John Deere 3040, 3140 Common Problems This Manual Covers
John Deere 3040 hydraulic pump loses lift, rockshaft and remote cylinders slow or dead under load
Check transmission/hydraulic reservoir oil level before condemning the pump. Tighten or replace leaking pump inlet lines per the troubleshooting chart on page 1028; air in the suction line kills prime. Then run the leakage test on page 1035: a lube oil pressure rise over 20 kPa (3 psi) with the pump shut off means internal leakage.
Manual Section: Hydraulic System Malfunctions p. 1028Transmission grinding and whining in all gears, noise gets worse once oil warms up
Drain the transmission oil and check the drain plug area for metal before splitting the tractor. Replace the transmission/hydraulic filter element after the first 50 hours and every 500 hours thereafter, schedule on page 49. Verify lube pressure: the first-stage regulating valve should open at 750 kPa (110 psi), spec on page 1027.
Manual Section: Power Train System MalfunctionsEngine cranks slowly or won't turn over at all on cold mornings
Clean battery terminals and check ground straps for corrosion, then trace the starting circuit with the wiring diagram. Test the starting motor and cold weather starting aids, fuel system section starting page 299. Change oil on the 200-hour schedule from page 48; the crankcase takes 11.5 liters (3.0 U.S. gal.) with a filter change, and thick old oil drags the starter down.
Manual Section: Electrical System MalfunctionsEngine loses power pulling under load, black smoke, runs fine at low idle
Replace the fuel filter and air cleaner element before chasing injection problems; follow the maintenance schedule. Drain the fuel tank water trap and inspect the intake for restrictions, fuel system section starting page 299. Change engine oil and crankcase filter every 200 hours per page 48; a sludged crankcase robs power too.
Manual Section: Fuel and Air Intake System Malfunctions p. 299Rockshaft lifts slowly or three-point hitch drops with implement raised, control lever feels loose
Adjust control lever play before tearing into the rockshaft: 5 mm (0.2 in.) on tractors without a cab, 10 mm (0.4 in.) with an OPU cab, 15 mm (0.6 in.) with an SG2 cab, all on page 1045. Then run the leakage tests starting on page 1035; a lube pressure rise over 20 kPa (3 psi) points to internal leakage.
Manual Section: Hydraulic System Malfunctions p. 1045Frequently Asked Questions
How to bleed air from the John Deere 3040 hydraulic system?
To bleed air from the hydraulic system, start the tractor engine and extend and retract the cylinder eight times. The air will bleed faster if the cylinder is held as shown in fig. 4 with the hose end upward. This procedure is found on page 1213/1373 of the manual. p. 1213
How do you fix john Deere 3040 hydraulic pump loses lift, rockshaft and remote cylinders slow or dead under load?
Work the troubleshooting chart on page 1028 in order rather than pulling the pump first: reservoir level, inlet-line tightness, then suction-side air. If lift is merely slow rather than dead, check control lever free play before condemning the pump — 5 mm with no cab, 10 mm with an OPU cab, 15 mm with an SG2 cab, page 1045 — a loose lever can look like weak lift. The page 1035 leakage test is the final confirm on the pump itself. p. 1028
How do you fix transmission grinding and whining in all gears, noise gets worse once oil warms up?
Noise that grows as the oil heats up usually means lubrication pressure, not gear wear yet — check that the first-stage regulating valve opens at 750 kPa (110 psi, page 1027) before anything else. If the valve checks out, move to the transmission/hydraulic filter interval on page 49 (first 50 hours, then every 500 hours) and inspect the drain plug for metal only after confirming pressure is correct.
How do you fix engine cranks slowly or won't turn over at all on cold mornings?
Split the diagnosis by symptom: a starter that's silent points to battery terminal corrosion and ground straps, tested through the starting circuit wiring diagram. A starter that turns but drags is usually cold, thickened oil in the 11.5-liter crankcase (page 48) — switch to a season-appropriate viscosity at the next 200-hour change. If it cranks fine but won't catch, the cold-weather starting aids covered from page 299 are the next stop.
What format is this John Deere 3040, 3140 manual in?
Immediate download of the complete 1373-page scanned Technical Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this John Deere 3040, 3140 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are there wiring harness diagrams in this John Deere 3040, 3140 manual?
Included. The John Deere 3040, 3140 Technical Manual provides a wiring diagram for the electrical system.
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