Wikitractor

John Deere 8420

Production ended · 4WD

PTO power · claimed

235 hp

Weight
23,780 lb
Engines
1 Diesel
Built
no record
Price new
no record

Power

Engine284 hp gross
Engine, maximum (boost)314 hp
PTO235 hp claimed
PTO, tested269.4 hp
Drawbar207.5 hp tested
Listed power284 hp engine basis

Engines

John Deere 8.1L 6-cyl dieselDiesel · 6 cyl496 ci
Engine details
John Deere 8.1L 6-cyl diesel
Bore × stroke
4.56 in × 5.06 in
Rated speed
2,200 rpm
Rated power
284 hp
Compression
16.5:1
Aspiration
turbocharged diesel
Cooling
liquid-cooled inline
Emissions
Tier II

Transmissions

John Deere PowerShiftfull power shift16F / 4R
Transmission notes

John Deere PowerShift: 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.

Weight

Weight23,780 lb operating
Shipping21,650 lb

Dimensions

Wheelbase118.9 in
Length211.9 in

Capacities

Fuel tank160 gal
Hydraulic system37 gal

Hydraulics

Systemclosed center pressure-flow compensated (PFC)
Pump flowno record
Total flow33.5 gpm
Remote valve flow30 gpm
Pressure2,900 psi
Remote valves4 to 5

Hitch

Rear hitch categoryIII/IIIN
Rear lift capacity15,180 lb
Front hitch categoryIIIN
Front lift capacity11,000 lb

PTO

Rear PTOindependent
Rear PTO speeds1000 (1.75)
Clutchhydraulic wet discs
Engine rpm at PTO speed540@1975

Chassis

Drive4WD
Steeringhydrostatic power
BrakesHydraulic wet disc brakes
CabCab standard

Tires

Front16.9R30
Rear18.4R46

Electrical

System voltage12 V
Batteries2
Cold cranking925 CCA
Chargingalternator
Charging output150 A
Groundnegative

Production

FactoriesWaterloo, Iowa, USA
Built byJohn Deere

Variants

  • 8420 wheeled tractor
  • 8420T crawler

Serial numbers

Serial number plate on rear of tractor.

YearFirst serial
20021001
200310001
200420001
200530001