The John Deere 4640 is a 2WD/4WD 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 4640 is equipped with a 7.6 L six-cylinder diesel engine and one of two transmissions: partial power shift transmission with 16 forward and 6 reverse gears or full power shift transmission with 8 forward and 4 reverse.
The John Deere 4640 row-crop tractor used the John Deere engine. It is a 7.6 L, 7,636 cm2, (466.0 cu·in) six-cylinder 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 157.2 PS (115.6 kW; 155.0 HP) of PTO output power.
The JD 4640 is equipped with hydrostatic power steering, differential hydraulic wet disc brakes, Sound-Gard cab and 314.2 liters (83 US gal.; 69.1 Imp. gal) fuel tank. This tractor could be equipped with the John Deere 168 loader.
John Deere 4640 Specifications
| General Specifications | |
| Model | John Deere 4640 |
| Length | 4,340 mm (170.9 in) |
| Width | 2,430 mm (95.7 in) |
| Height | 2,970 mm (116.9 in) |
| Wheel base | 3,000 mm (118.1 in) |
| Weight | 7,121 kg (15,700 lbs) |
| Fuel tank capacity | 314.2 liters (83.0 US gal.; 69.0 Imp. gal) |
| Battery | 6V x 2 |
| 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 | 157.2 PS (115.6 kW; 155.0 HP) |
| Starter | Electric |
| Oil capacity: | 18.9 L (20 US. qt, 16.6 Imp. qt.) |
| Coolant capacity: | 36.0 L (38 US. qt, 31.7 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD or 4×4 MFWD 4WD |
| Steering type | Hydrostatic power |
| Brakes | Differential hydraulic wet disc |
| Differential lock | Pedal-actuated hydraulic |
| Transmission model | John Deere Quad-Range |
| Transmission type | Partial power shift |
| Gears | 16 forward and 6 reverse |
| Speed | Forward: 31.5 kmh (19.6 mph) Reverse: 20.3 (12.6 mph) |
| Transmission model | John Deere PowerShift |
| Transmission type | Full power shift |
| Gears | 8 forward and 4 reverse |
| Speed | Forward: 31.4 kmh (19.5 mph) Reverse: 10.8 (6.7 mph) |
| Tires | |
| Front tires | Ag: 11.00-16, 10.00-16, 14L-16.1, 16.5L-16.1, 9.50-20 |
| Rear tires | Ag: 18.4-38, 24.5-32, 30.5-32, 20.8-38, 18.4-42 |
| Three-Point Hitch | |
| Caterogy | III/IIIN |
| Control type | – |
| Lift capacity (at ends) | 3,320 kg (7,320 lbs) |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent |
| Rear PTO spped | 1,000 rpm |
| Hydraulic system | |
| Hydraulic type | Closed center |
| Hydraulic capacity | 62.5 L (66.04 US. qt, 54.99 Imp. qt.) |
| Valves | 2 to 3 |
| Pump flow | 23.0 gpm (87.1 lpm) |