John Deere

John Deere 8420

The John Deere 8420 is a row-crop tractor produced from 2002 to 2005 as part of the 8020 Series. It features a powerful 8.1L 6-cylinder turbocharged diesel engine with a rated net power of 270 hp and a maximum gross power of 314 hp. The tractor is equipped with a 16-speed full power shift John Deere PowerShift transmission and offers hydrostatic power steering, hydraulic wet disc brakes, and optional trailer brakes. It has a wheelbase of approximately 119 inches and weighs around 21,650 to 23,780 pounds depending on configuration. The 8420 includes a closed center pressure-flow compensated hydraulic system with up to 42.5 gpm flow available with an optional pump. It has a rear PTO with multiple speed options and a variety of hitch configurations. The tractor was built in Waterloo, Iowa, USA, and is part of a series that includes models such as the 8410, 8320, 8430, and 8520.

Power284 hp

Founded2002 - 2005

Model8420

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Technical Specifications

Detailed specifications and technical data for John Deere 8420

Power

Engine (max)	314 hp (234.1 kW)
Engine (net)	270 hp (201.3 kW)
PTO (tested)	269.41 hp (200.9 kW)
PTO (claimed)	235 hp (175.2 kW)
Engine (gross)	284 hp (211.8 kW)
Drawbar (tested)	207.49 hp (154.7 kW)

Tires

Rear tire	18.4R46
Front tire	16.9R30

Engine

Type	turbocharged diesel
Model	John Deere 8.1L 6-cyl diesel
Cooling	liquid-cooled inline
Idle RPM	900-2300
Cylinders	6-cylinder
Emissions	Tier II
Rated RPM	2200
Air cleaner	dry with secondary element
Bore/Stroke	4.56x5.06 inches (116 x 129 mm)
Compression	16.5:1
Fuel system	electronic high-pressure common rail (HPCR)
Displacement	496 ci (8.1 L)
Oil capacity	28.5 qts (27.0 L)
Operating RPM	1500-2200
Starter volts	12
Coolant capacity	35.9 qts (34.0 L)
Rated Power (net)	270 hp (201.3 kW)
Maximum Power (net)	300 hp (223.7 kW)
Oil change interval	250 h
Rated Power (gross)	284 hp (211.8 kW)
Maximum Power (gross)	314 hp (234.1 kW)

Weight

Shipping	21,650 lbs (9820 kg)
Operating	23,780 lbs (480/80R46 duals) (10786 kg)
Max Drawbar	3,900 lbs (Cat 3 extended) (1769 kg), 6,070 lbs (Cat 3 short) (2753 kg), 10,000 lbs (Cat 4) (4536 kg)
ILS Shipping	23,050 lbs (10455 kg)

Capacity

Fuel	160 gal (605.6 L)
Front hubs	3.6 qts (3.4 L)
Front diff.	14.2 qts (13.4 L)
ILS Front hubs	4.2 qts (4.0 L)
Hydraulic system	37 gal (140.0 L)
ILS Hydraulic system	39.6 gal (149.9 L)

Variants

8420	wheeled tractor
8420T	crawler

Dimensions

Length	211.9 inches (538 cm)
Wheelbase	118.9 inches (302 cm), 117.7 inches (ILS) (298 cm)
Front axle	4WD, Independent Link Suspension
Height (cab)	122.2 inches (310 cm)
4WD Front tread	60 to 80 inches (152 to 203 cm)
ILS Front tread	60 to 88 inches (152 to 223 cm)
Rack-and-pinion rear axle	4.331 by 118.5 inches (110 by 3009 mm), 4.724 by 118.5 inches (119 by 3009 mm)

Electrical

Ground	negative
Batteries	2
Battery CCA	925
Battery volts	12
Charging amps	150
Charging system	alternator

Hydraulics

Type	closed center pressure-flow compensated (PFC)
Valves	4 to 5
Capacity	37 gal (140.0 L)
Pressure	2900 psi (200.0 bar)
SCV flow	30 gpm (113.6 lpm)
Total flow	33.5 gpm (126.8 lpm) with standard 45cc pump, 42.5 gpm (160.9 lpm) optional 57cc pump
ILS Capacity	39.6 gal (149.9 L)

Mechanical

Cab	standard
Brakes	Hydraulic wet disc brakes
Steering	hydrostatic power
Trailer brakes	hydraulic optional
Four-wheel drive	yes

Production

Type	Row-Crop tractor
Series	8020 Series
Built in	Waterloo, Iowa, USA
Years made	2002 - 2005

Transmission

Type	John Deere PowerShift
Gears	16 forward and 4 reverse
Clutch	hydraulic wet disc
Features	Full power shift transmission with single shift lever with display on cab corner post. Tractor begins in 7 (forward) and 2 (reverse) on start up. Clutch pedal may be used to pre-select a gear by holding clutch and pressing lever until desired gear is reached. Automatic PowerShift (APS) allows automated shifting to match load.
Oil capacity	148 qts (140.1 L), 158.4 qts (ILS) (149.9 L)
Full power shift	yes

Tractor hitch