The John Deere 4840 is a 2WD row-crop tractor from the Iron Horses series. This tractor was manufactured by John Deere in Waterloo, Iowa, USA from 1978 to 1982. The JD 4840 is equipped with a 7.6 L six-cylinder diesel engine and full power shift transmission with 8 forward and 4 reverse gears.
The John Deere 4840 row-crop tractor used the John Deere engine. It is a 7.6 L, 7,636 cm2, (466.0 cu·in) six-cylinder turbocharged intercooled diesel engine with 116.0 mm (4.57 in) of the cylinder bore and 121.0 mm (4.76 in) of the piston stroke. This engine produced 202.6 PS (149.0 kW; 200.0 HP) of output power.
The John Deere 4840 is equipped with power steering, differential hydraulic wet disc brakes, Sound-Gard Cab and 390.0 liters (103 US gal.; 85.8 Imp. gal) fuel tank.
John Deere 4840 Specifications
| General Specifications | |
| Model | John Deere 4840 |
| Length | 4,490 mm (176.8 in) |
| Width | 2,430 mm (95.7 in) |
| Height | 2,970 mm (116.9 in) |
| Wheel base | 3,000 mm (118.1 in) |
| Weight (operating) | 8,165 kg (18,000 lbs) |
| Fuel tank capacity | 390.0 liters (103 US gal.; 85.8 Imp. gal) |
| Battery | Two 6V |
| Cabin type | Sound-Gard Cab |
| Engine | |
| Engine model | John Deere |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 6 |
| Fuel type | Diesel |
| Displacement | 7.6 L, 7,636 cm2, (466.0 cu·in) |
| Bore and stroke | 116.0 mm X 121.0 mm (4.57 in X 4.76 in) |
| Compression ratio | 15.5:1 |
| Horsepower | 202.6 PS (149.0 kW; 200.0 HP) |
| Starter | Electric |
| Coolant capacity: | 37.9 L (40 US. qt, 33.3 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | Power |
| Brakes | Differential hydraulic wet disc |
| Differential lock | Pedal-actuated hydraulic |
| Transmission model | John Deere PowerShift |
| Transmission type | Full power shift |
| Gears | 8 forward and 4 reverse |
| Speed | Forward: 29.9 kmh (18.6 mph) Reverse: 10.3 (6.4 mph) |
| Transmission oil capacity | 75.7 L (20 US. gal, 16.7 Imp. gal.) |
| Tires | |
| Front tires | Ag: 11.00-16 |
| Rear tires | Ag: 18.4-38 |
| Three-Point Hitch | |
| Caterogy | III/IIIN |
| Control type | – |
| Lift capacity (at ends) | 3,760 kg (8,290 lbs) |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent |
| Rear PTO speed | 1,000 rpm |
| Hydraulic system | |
| Hydraulic type | Closed center |
| Hydraulic capacity | 62.5 L (66.04 US. qt, 54.99 Imp. qt.) |
| Valves | 2 or 3 |
| Pump flow | 23.0 gpm (87.1 lpm) |