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John Deere 8420

John Deere 8420 tractor
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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.
John Deere 8420tractor specs8020 Seriesrow-crop tractor8.1L enginePowerShift transmissionhydraulic systemPTOtractor dimensions
Power284 hp
Founded2002 - 2005
Model8420

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

Rear Type:III/IIIN
Rear lift:15180 lbs (6885 kg), 17300 lbs optional (7847 kg)
Front lift:11000 lbs (4989 kg)
Front Hitch:IIIN optional

Serial Numbers

2002:1001
2003:10001
2004:20001
2005:30001
Location:Serial number plate on rear of tractor.

Power Take-off (PTO)

Clutch:hydraulic wet discs
Rear PTO:independent
Engine RPM:540@1975, 1000@2200
Rear PTO Type:1000 (1.75), 540/1000 (1.375 optional)

Related Models

John Deere 8430

Model:8430

John Deere 8320

Model:8320

John Deere 8520

Model:8520

John Deere 8410

Model:8410