John Deere 840
The John Deere 840 is a utility tractor produced from 1976 to 1986 in Mannheim, Germany. It features a 2.9L 3-cylinder liquid-cooled diesel engine producing 37.5 hp (28.0 kW) with a PTO power of 33.5 hp (25.0 kW). Transmission options include an 8-speed collar shift and a 16-speed two-speed power shift. The tractor has two-wheel drive with planetary final drives, manual steering, hydraulic wet disc brakes, and a four-post ROPS. Fuel capacity is 20.6 gallons (78.0 L) and hydraulic system capacity is 10.8 gallons (40.9 L) with a closed center hydraulic system and 6.1 gpm pump flow. The rear hitch is category II/I with a lift capacity of 4878 lbs (2212 kg). PTO options include live rear PTO with optional independent and wet disc clutches, and an optional front PTO. Dimensions include a 74.4 inch (188 cm) wheelbase, 138 inch (350 cm) length, and 5004 lbs (2269 kg) shipping weight. Tires are 6.50-16 front and various rear sizes. Electrical system features a 12 volt negative ground with alternator charging at 33 amps and two batteries.
Power37 hp
Founded1976 - 1986
Model840
Technical Specifications
Detailed specifications and technical data for John Deere 840
Power
| Engine | 37.5 hp (28.0 kW) |
|---|---|
| PTO (claimed) | 33.5 hp (25.0 kW) |
Tires
| Ag rear | 12.4-32, 9.5-36, 12.4-28 |
|---|---|
| Ag front | 6.50-16 |
Engine
| Type | John Deere 2.9L 3-cyl diesel |
|---|---|
| Power | 37.5 hp (28.0 kW) |
| Details | John Deere diesel 3-cylinder liquid-cooled |
| Rated RPM | 2400 |
| Bore/Stroke | 4.19x4.33 inches (106 x 110 mm) |
| Compression | 16.8:1 |
| Fuel system | direct injection |
| Displacement | 179 ci (2.9 L) |
| Oil capacity | 7.4 qts (7.0 L) |
| Operating RPM | 1300-2400 |
| Starter power | 4 hp (3.0 kW) |
| Starter volts | 12 |
| Coolant capacity | 11.1 qts (10.5 L) |
Capacity
| Fuel | 20.6 gal (78.0 L) |
|---|---|
| Hydraulic system | 10.8 gal (40.9 L) |
Dimensions
| Width | 65.4 inches (166 cm) |
|---|---|
| Length | 138 inches (350 cm) |
| Wheelbase | 74.4 inches (188 cm) |
| Rear tread | 53.5 to 73.2 inches (135 to 185 cm) |
| Front tread | 49.6 to 79.5 inches (125 to 201 cm) |
| Height (ROPS) | 94.1 inches (239 cm) |
| Shipping weight | 5004 lbs (2269 kg) |
| Height (exhaust) | 103.1 inches (261 cm) |
| Clearance (front axle) | 21 inches (53 cm) |
Electrical
| Ground | negative |
|---|---|
| Batteries | 2 |
| Battery volts | 12 |
| Charging amps | 33 |
| Charging system | alternator |
Hydraulics
| Type | closed center |
|---|---|
| Capacity | 10.8 gal (40.9 L) |
| Pump flow | 6.1 gpm (23.1 lpm) |
Mechanical
| ROPS | Four-post ROPS |
|---|---|
| Drive | Two-wheel drive |
| Brakes | Hydraulic wet disc brakes |
| Steering | Manual steering |
| Final drives | planetary |
Production
| Built in | Mannheim, Baden-Württemberg, Germany |
|---|---|
| Category | Utility tractor |
| Years produced | 1976 - 1986 |
Transmission
| Options | 8-speed collar shift, 16-speed two-speed power shift |
|---|---|
| Collar shift | Typecollar shift Gears8 forward and 4 reverse Clutchdry disc |
| Two-speed power shift | Typetwo-speed power shift Gears16 forward and 8 reverse |
Tractor hitch
| Rear Type | II/I |
|---|---|
| Rear lift | 4878 lbs (2212 kg) |
Power Take-off (PTO)
| Clutch | dry disc |
|---|---|
| Rear PTO | live |
| Front PTO | optional |
| Rear PTO Type | 540 |
| Front PTO Type | 1000 |
| Clutch optional | wet disc Optional, independent PTO |
| Rear PTO optional | independent Optional |
| Engine RPM (rear PTO) | 540@2400 |
| Engine RPM (front PTO) | 1000@2070 |
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