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Tractor · 2002Unverified

John Deere 8420

Name: John Deere 8420
Brand: John Deere

John Deere 8420 — Row-Crop tractor · 284 hp. Reference specifications; pending source verification.

The John Deere 8420 is a tractor rated at approximately 284 horsepower, placing it at the higher end of its class in terms of power output. Produced between 2002 and 2005, this model features a 6-cylinder turbocharged diesel liquid-cooled engine, paired with four-wheel drive and a hydrostatic transmission. The 8420's operating weight ranges from 21650 to 23780 pounds, and it is suitable for large-scale operations covering 1,500+ acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

284 hp

Max power

200.9 kW

Weight

21650 to 23780 pounds

Catalogue coverage

Variants represented

Richest spec table

117 rows

Recorded power

284 hp

Transmissions

16-speed full power shift

Production years

2002-2005

Verified variants

1 linked source document displayed

Hover a source tag to verify

Overview

ManufacturerJohn DeereReference

Row-Crop tractorReference

Built in Waterloo, Iowa, USAReference

Four-wheel driveReference

Steeringhydrostatic powerReference

Hydraulic wet disc brakesReference

Trailer brakeshydraulicReference

Cab standard.Reference

Variants

8420wheeled tractorReference

8420TcrawlerReference

Engine

John Deere 8.1L 6-cyl dieselReference

Engine (gross)211.8 kWReference

Engine (net)201.3 kWReference

Engine (max)234.1 kWReference

Drawbar (tested)154.7 kWReference

John DeereReference

turbocharged dieselReference

6-cylinderReference

liquid-cooled inlineReference

Displacement8.1 LReference

Bore/Stroke116 x 129 mmReference

EmissionsTier IIReference

Rated Power (net)201.3 kWReference

Rated Power (gross)211.8 kWReference

Maximum Power (net)223.7 kWReference

Maximum Power (gross)234.1 kWReference

Fuel systemelectronic high-pressure common rail (HPCR)Reference

Air cleanerdry with secondary elementReference

Compression16.5:1Reference

Rated RPM2200Reference

Idle RPM900-2300Reference

Operating RPM1500-2200Reference

Starter volts12Reference

Coolant capacity34.0 LReference

Oil capacity27.0 LReference

Oil change250 hReference

Max power200.9 kWReference

Power at rated engine speed175.6 kWReference

Max power154.7 kWReference

Transmission

16-speed full power shiftReference

TransmissionJohn Deere PowerShiftReference

Typefull power shiftReference

Gears16 forward and 4 reverseReference

Clutchhydraulic wet discReference

Oil capacity140.1 LReference

Oil capacity149.9 LReference

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.Reference

PTO & Hydraulics

PTO (claimed)175.2 kWReference

PTO (tested)200.9 kWReference

Hydraulic system140.0 LReference

ILS Hydraulic system149.9 LReference

Typeclosed center pressure-flow compensated (PFC)Reference

Capacity140.0 LReference

ILS Capacity149.9 LReference

Pressure200.0 barReference

Valves4 to 5Reference

SCV flow113.6 lpmReference

Total flow126.8 lpmReference

Total flow160.9 lpmReference

Rear TypeIII/IIINReference

Rear lift6885 kgReference

Rear lift7847 kgReference

Front HitchIIINReference

Front lift4989 kgReference

Rear PTOindependentReference

Clutchhydraulic wet discsReference

Rear PTO Type1000 (1.75)Reference

Rear PTO Type540/1000 (1.375 optional)Reference

Engine RPM540@1975Reference

Engine RPM1000@2200Reference

Capacities

Fuel605.6 LReference

Front hubs3.4 LReference

ILS Front hubs4.0 LReference

Front diff.13.4 LReference

Dimensions

Wheelbase302 cmReference

Wheelbase298 cmReference

Weight21650 to 23780 poundsReference

Front tire16.9R30Reference

Rear tire18.4R46Reference

Ag front16.9R30Reference

Ag rear18.4R46Reference

Length538 cmReference

Height (cab)310 cmReference

Front axle4WDReference

Front axleIndependent Link SuspensionReference

Rack-and-pinion rear axle110 by 3009 mmReference

Rack-and-pinion rear axle119 by 3009 mmReference

4WD Front tread152 to 203 cmReference

ILS Front tread152 to 223 cmReference

Shipping9820 kgReference

ILS Shipping10455 kgReference

Operating10786 kgReference

Max Drawbar1769 kgReference

Max Drawbar2753 kgReference

Max Drawbar4536 kgReference

8420 Serial Numbers

Location:Serial number plate on rear of tractor.Reference

20021001Reference

200310001Reference

200420001Reference

200530001Reference

FAQ: How to read a serial number table.Reference

Electrical

GroundnegativeReference

Charging systemalternatorReference

Charging amps150Reference

Batteries2Reference

Battery CCA925Reference

Battery volts12Reference

Test results

Diesel 16-speed 4WDMay 7 - 31, 2002Link: OCED Tractor Test 1800 fileReference

PTO performanceReference

Fuel use54.9 l/hourReference

Fuel use51.9 l/hourReference

Drawbar performanceReference

Fuel use51.5 l/hourReference

Gear 8 used for power test.Reference

Max pull13591 kgReference

Gear 3 used for pull test.Reference

Speeds

With 18.4R46 rear tires.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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