The John Deere 8120 is a 2WD or 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 8120 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.
The John Deere 8120 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 233.2 PS (171.5 kW; 230.0 HP) at 2,200 rpm of output power.
The JD 8120 is equipped with hydrostatic power steering, hydraulic wet disc brakes, Cab (standard), and 511.0 liters (135 US gal.; 112.4 Imp. gal) fuel tank.
John Deere 8120 Specifications
| General Specifications | |
| Model | John Deere 8120 |
| Length | 5,330 mm (209.8 in) Long frame: 5,380 mm (211.8 in) |
| Width | – |
| Height | – |
| Wheel base | 2WD: 3,130 mm (123.2 in) 4WD: 2,960 mm (116.5 in) ILS: 2,930 mm (115.7 in) Long frame: 3,020 mm (118.9 in) |
| Weight (shipping) | 2WD: 8,665 kg (19,105 lbs) 4WD: 9,550 kg (21,055 lbs) ILS: 10,185 kg (22,450 lbs) Long frame: 9,820 kg (21,650 lbs) |
| Fuel tank capacity | 511.0 liters (135 US gal.; 112.4 Imp. gal) Optional: 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 | 233.2 PS (171.5 kW; 230.0 HP) at 2,200 rpm |
| Starter | Electric |
| Oil type | SAE 5W-30, 0W-40 |
| Oil capacity: | 21.5 L (22.7 US. qt, 18.9 Imp. qt.) |
| Coolant capacity: | 34.0 L (35.9 US. qt, 29.9 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD or 4×4 MFWD 4WD |
| Steering type | Hydrostatic power |
| Brakes | Hydraulic wet disc |
| Front hubs | 3.4 L (3.6 US.qts, 3.0 Imp. qts) ILS: 4.0 L (4.2 US.qts, 3.5 Imp. qts) |
| Front diff | 13.4 L (14.2 US.qts, 11.8 Imp. qts) |
| 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 US. gal, 30.8 Imp. gal.) |
| Tires | |
| Front tires | Ag: 11.00-24 |
| Rear tires | Ag: 480/80R46 |
| Three-Point Hitch | |
| Category | III/IIIN |
| Control type | – |
| Lift capacity | 5,580 kg (12,300 lbs) 6,885 kg (15,180 lbs) |
| Front hitch | |
| Category | IIIN |
| Lift capacity | 4,990 kg (11,000 lbs) |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent with hydraulic wet disc clutch |
| Rear PTO speed | 1000 (1.75) or 540/1000 (1.375 optional) |
| Hydraulic system | |
| Hydraulic type | Closed center pressure-flow compensated (PFC) |
| Hydraulic capacity | 140.0 L (37 US. gal, 30.8 Imp. gal.) ILS: 150.0 L (39.6 US. gal, 33.0 Imp. gal.) |
| Pressure | 2900 psi (199.9 bar) |
| Valves | 5 |
| SCV flow | 30.0 gpm (113.6 lpm) |
| Total flow | 33.5 gpm (126.8 lpm) 42.5 gpm (160.9 lpm) |
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