John Deere 8420
The John Deere 8420 is a tractor produced by John Deere. It is equipped with a 496 ci 8.1 L engine. The listed engine power is Diesel (net): 270 hp / 201.3 kW; Diesel (gross): 284 hp / 211.8 kW. Transmission: John Deere PowerShift. Operating weight: 21650 to 23780 pounds.
Engine Power
Diesel (net): 270 hp / 201.3 kW; Diesel (gross): 284 hp / 211.8 kW
Fuel & Capacities
160 gal
605.6 L
Transmission
John Deere PowerShift
Operating Weight
21650 to 23780 pounds
Overview
 | 2002 - 2005
8020 SeriesRow-Crop tractor
8020 Series
Row-Crop tractor |
|---|
Production | |
|---|---|
Manufacturer | John Deere |
Row-Crop tractor | |
Built in Waterloo, Iowa, USA | |
Variants | |
|---|---|
8420 | wheeled tractor |
8420T | crawler |
John Deere 8420 Engine | |
|---|---|
John Deere 8.1L 6-cyl diesel | |
Engine details ...  |
John Deere 8420 Transmission | |
|---|---|
16-speed full power shift | |
Transmission details ...  |
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 |
Performance test details ...  | |
Mechanical | |
|---|---|
Four-wheel drive | |
Steering | hydrostatic power |
Hydraulic wet disc brakes | |
Trailer brakes | hydraulic OptOptional |
Cab standard. | |
Capacity | |
|---|---|
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 |
Hydraulics | |
|---|---|
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*With standard 45cc pump
126.8 lpm |
42.5 gpm*Optional 57cc pump
160.9 lpm | |
Tractor hitch | |
|---|---|
Rear Type | III/IIIN |
Rear lift | 15180 lbs
6885 kg |
17300 lbsOptOptional
7847 kg | |
Front Hitch | IIIN OptOptional |
Front lift | 11000 lbs
4989 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Clutch | hydraulic wet discs |
Rear PTO Type | 1000 (1.75) |
540/1000 (1.375 optional) | |
Engine RPM | 540@1975 |
1000@2200 | |
Dimensions & Tires | |
|---|---|
Wheelbase | 118.9 inches
302 cm |
117.7 inches (ILS)
298 cm | |
Weight | 21650 to 23780 pounds |
Front tire | 16.9R30 |
Rear tire | 18.4R46 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | alternator |
Charging amps | 150 |
Batteries | 2 |
Battery CCA | 925 |
Battery volts | 12 |
Engine
Engine Detail — 496 ci / 8.1 L Diesel
Manufacturer | John Deere |
Configuration | turbocharged diesel, 6-cylinder, liquid-cooled inline |
Displacement | 496 ci
8.1 L |
Bore/Stroke | 4.56x5.06 inches
116 x 129 mm |
Emissions | Tier II |
Rated Power (net) | 270 hp
201.3 kW |
Rated Power (gross) | 284 hp
211.8 kW |
Maximum Power (net) | 300 hp
223.7 kW |
Maximum Power (gross) | 314 hp
234.1 kW |
Fuel system | electronic high-pressure common rail (HPCR) |
Air cleaner | dry with secondary element |
Compression | 16.5:1 |
Rated RPM | 2200 |
Idle RPM | 900-2300 |
Operating RPM | 1500-2200 |
Starter volts | 12 |
Coolant capacity | 35.9 qts
34.0 L |
Oil capacity | 28.5 qts
27.0 L |
Oil change | 250 h |
Transmission
Transmission — John Deere PowerShift
Transmission | John Deere PowerShift |
Type | full power shift |
Gears | 16 forward and 4 reverse |
Clutch | hydraulic wet disc |
Oil capacity | 148 qts
140.1 L |
158.4 qts (ILS)
149.9 L | |
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. | |
With 18.4R46 rear tires. | |
 | |
Dimensions
John Deere 8420 Tires | |
|---|---|
Ag front | 16.9R30 |
Ag rear | 18.4R46 |
Dimensions | |
|---|---|
Wheelbase | 118.9 inches
302 cm |
117.7 inches (ILS)
298 cm | |
Length | 211.9 inches
538 cm |
Height (cab) | 122.2 inches
310 cm |
Front axle | 4WD |
Front axle | Independent Link Suspension |
Rack-and-pinion rear axle | 4.331 by 118.5 inches
110 by 3009 mm |
Rack-and-pinion rear axle | 4.724 by 118.5 inches
119 by 3009 mm |
4WD Front tread | 60 to 80 inches
152 to 203 cm |
ILS Front tread | 60 to 88 inches
152 to 223 cm |
John Deere 8420 Weight | |
|---|---|
Shipping | 21,650 lbs
9820 kg |
ILS Shipping | 23,050 lbs
10455 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 | |
Tests
OCED Tractor Test 1800 | |
|---|---|
Diesel 16-speed 4WD
May 7 - 31, 2002
Link: OCED Tractor Test 1800 file | |
PTO performance | |
Max power | 269.41 hp
200.9 kW |
Fuel use | 14.5 gal/hour
54.9 l/hour |
Power at rated engine speed | 235.45 hp
175.6 kW |
Fuel use | 13.7 gal/hour
51.9 l/hour |
Drawbar performance | |
Max power | 207.49 hp
154.7 kW |
Fuel use | 13.6 gal/hour
51.5 l/hour |
Gear 8 used for power test. | |
Max pull | 29,964 lbs
13591 kg |
Gear 3 used for pull test. | |
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for John Deere 8420.
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
John Deere 8420 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for John Deere 8420.
Converted Equivalents:
Horsepower (HP)0 hp
Kilowatts (kW)0 kW
Metric Horsepower (PS / CV)0 PS
Direct Competitor Comparison
Compare John Deere 8420 against same-era industry alternatives in the same horsepower class.
Current Model
John Deere
John Deere 8420
Engine Power:Diesel (net): 270 hp / 201.3 kW; Diesel (gross): 284 hp / 211.8 kW
★ Baseline Reference
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