The John Deere 8420 is a 4WD row-crop tractor from the 8020 series. This tractor was manufactured by John Deere in Waterloo, Iowa, USA from 2002 to 2005. The John Deere 8420 is equipped with a 8.1 L (496.0 cu·in) six-cylinder diesel engine and a full power shift transmission with 16 forward and 4 reverse gears and hydraulic wet disc clutch.
The JD 8420 row-crop tractor used the John Deere engine. It is a 8.1 L, 8,128 cm2, (496.0 cu·in) six-cylinder turbocharged diesel engine with 116.0 mm (4.57 in) of the cylinder bore and 129.0 mm (5.08 in) of the piston stroke. The compression ratio rating is 16.5:1. This engine produced 273.8 PS (201.3 kW; 270.0 HP) at 2,200 rpm of net output power.
The JD 8420 is equipped with hydrostatic power steering, hydraulic wet disc brakes, cab (standard), and 605.6 liters (160 US gal.; 133.2 Imp. gal) fuel tank.
John Deere 8420 Specifications
| General Specifications | |
| Model | John Deere 8420 |
| Length | 5,380 mm (211.8 in) |
| Width | – |
| Height (cab) | 3,100 mm (122 in) |
| Wheel base | 3,020 mm (118.9 in) ILS: 2,980 mm (117.3 in) |
| Weight (operating) | 480/80R46 duals: 10,785 kg (23,777 lbs) |
| Fuel tank capacity | 605.6 liters (160 US gal.; 133.2 Imp. gal) |
| Battery | Two 12V, CCA 925A |
| Cabin type | Cab (standard) |
| Engine | |
| Engine model | John Deere |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 6 |
| Fuel type | Diesel |
| Displacement | 8.1 L, 8,128 cm2, (496.0 cu·in) |
| Bore and stroke | 116.0 mm X 129.0 mm (4.57 in X 5.08 in) |
| Compression ratio | 16.5:1 |
| Horsepower | 273.8 PS (201.3 kW; 270.0 HP) at 2,200 rpm |
| Starter | Electric |
| Oil capacity: | 27.0 L (28.5 US. qt, 23.8 Imp. qt.) |
| Coolant capacity: | 34.0 L (35.9 US. qt, 29.9 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×4 MFWD 4WD |
| Steering type | Hydrostatic power |
| Brakes | Hydraulic wet disc |
| Transmission model | John Deere PowerShift |
| Transmission type | Full power shift with hydraulic wet disc clutch |
| Gears | 16 forward and 4 reverse |
| Speed | Forward: 39.9 kmh (24.8 mph) Reverse: 10.9 kmh (6.8 mph) |
| Transmission oil capacity |
140.1 L (37.0 US. gal, 30.8 Imp. gal.) ILS: 149.9 L (39.6 US. gal, 33.0 Imp. gal.) |
| Tires | |
| Front tires | Ag: 16.9R30 |
| Rear tires | Ag: 18.4R46 |
| Three-Point Hitch | |
| Category | III/IIIN |
| Control type | – |
| Lift capacity (at ends) |
6,885 kg (15,180 lbs) 7,845 kg (17,300 lbs) |
Front Hitch |
| Category | IIIN |
| Lift capacity (at ends) | 4,990 kg (11,000 lbs) |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent with hydraulic wet discs clutch |
| Rear PTO speed | 1000, 540/1000 rpm |
| Hydraulic system | |
| Hydraulic type | Closed center pressure-flow compensated (PFC) |
| Pressure | 2900 psi (199.9 bar) |
| Valves | 4 to 5 |
| SCV flow | 30.0 gpm (113.6 lpm) |
| Total flow |
42.5 gpm (160.9 lpm) 33.5 gpm (126.8 lpm) |
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