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John Deere 8420

John Deere 8420 tractor photo
2002 - 2005   8020 Series
Row-Crop tractor
Previous model:John Deere 8410
Next model:John Deere 8430
Series next:John Deere 8520
Series back:John Deere 8320



Manufacturer:John Deere
Factory:Waterloo, Iowa, USA


8420:wheeled tractor

John Deere 8420 Engine:

   John Deere 8.1L 6-cyl diesel
full engine details ...


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

3-Point Hitch:

Rear Type:III/IIIN
Rear lift:15180 lbs [6885 kg]
 17300 lbs [7847 kg] *Optional
Front Hitch:IIIN*Optional
Front lift:11000 lbs [4989 kg]

Power Take-off (PTO):

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

Dimensions & Tires:

Wheelbase:118.9 inches [302 cm]
 117.7 inches [298 cm] (ILS)
Weight:21650 to 23780 pounds
Front tire:16.9R30
Rear tire:18.4R46
full dimensions and tires ...

8420 Serial Numbers:

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

how to read serial numbers...


John Deere 8420 Power:

Engine (gross):284 hp [211.8 kW]
Engine (net):270 hp [201.3 kW]
Engine (max):314 hp [234.1 kW]
PTO (claimed):235 hp [175.2 kW]
Drawbar (tested):207.49 hp [154.7 kW]
PTO (tested):269.41 hp [200.9 kW]
power test details ...


Chassis:4x4 MFWD 4WD
Steering:hydrostatic power
Brakes:hydraulic wet disc
Trailer brakes:hydraulic*Optional
Cab:Cab standard.


Type:closed center pressure-flow compensated (PFC)
Capacity:37 gal [140.0 L]
ILS Capacity:39.6 gal [149.9 L]
Pressure:2900 psi [200.0 bar]
Valves:4 to 5
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


Charging system:alternator
Charging amps:150


Cold-cranking amps:925

Page information:

Last update:May 27, 2015
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