John Deere 8420

John Deere 8420The 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
ModelJohn Deere 8420
Length5,380 mm (211.8 in)
Height (cab)3,100 mm (122 in)
Wheel base3,020 mm (118.9 in)
ILS: 2,980 mm (117.3 in)
Weight (operating) 480/80R46 duals: 10,785 kg (23,777 lbs)
Fuel tank capacity605.6 liters (160 US gal.; 133.2 Imp. gal)
BatteryTwo 12V, CCA 925A
Cabin typeCab (standard)
Engine modelJohn Deere
Engine typeFour-stroke, liquid-cooled, inline
Fuel typeDiesel
Displacement8.1 L, 8,128 cm2, (496.0 cu·in)
Bore and stroke116.0 mm X 129.0 mm (4.57 in X 5.08 in)
Compression ratio16.5:1
Horsepower273.8 PS (201.3 kW; 270.0 HP) at 2,200 rpm
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
Chassis4×4 MFWD 4WD
Steering typeHydrostatic power
BrakesHydraulic wet disc
Transmission modelJohn Deere PowerShift
Transmission typeFull power shift with hydraulic wet disc clutch
Gears16 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.)
Front tires Ag: 16.9R30
Rear tires Ag: 18.4R46


Three-Point Hitch
Control type
Lift capacity (at ends) 6,885 kg (15,180 lbs)
7,845 kg (17,300 lbs)
Front Hitch
Lift capacity (at ends)4,990 kg (11,000 lbs)
PTO (Power take-off shaft)
Rear PTO typeIndependent with hydraulic wet discs clutch
Rear PTO speed1000, 540/1000 rpm
Hydraulic system
Hydraulic typeClosed center pressure-flow compensated (PFC)
Pressure2900 psi (199.9 bar)
Valves4 to 5
SCV flow30.0 gpm (113.6 lpm)
Total flow 42.5 gpm (160.9 lpm)
33.5 gpm (126.8 lpm)
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