John Deere 8420T

John Deere 8420T Agricultural Crawler tractor Technical Specifications

John Deere 8420T is a Row-Crop tractor that was produced by the John Deere between 2002 – 2005.

Below you will find detailed technical specifications for John Deere 8420T covering engine types, horsepower ratings, weight, height, fuel type and tank volume, oil capacity and type, hydraulic system diagram, wiring diagram, battery specs, etc.

John Deere 8420T Production

Manufacturer: John Deere
Type: Agricultural Crawler tractor
Factory: Waterloo, Iowa, USA

John Deere 8420T 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): 205.84 hp
153.5 kW
PTO (tested): 270.62 hp
201.8 kW

John Deere 8420T Electrical

Ground: negative
Charging system: alternator
Charging amps: 150
Batteries: 2
Battery CCA: 925
Battery volts: 12

John Deere 8420T Mechanical

Chassis: crawler
Steering: electro-hydraulic power
Brakes: hydraulic wet disc
Cab: Cab standard.
Transmission: 16-speed full power shift


Fuel: 130 gal
492.1 L
Hydraulic system: 65 gal
246.0 L


Type: closed center pressure flow compensated (PFC)
Capacity: 65 gal
246.0 L
Pressure: 2900 psi
200.0 bar
Valves: 5
Pump flow: 30 gpm
113.6 lpm
Total flow: 33.5 gpm
126.8 lpm
  42.5 gpm
160.9 lpm (optional)

Tracktor Hitch

Rear Type: III/IIIN
Rear lift: 15,180 lbs
6885 kg

Power Take-off (PTO)

Rear PTO: independent
Rear RPM: 1000 (1-3/4)

John Deere 8420T Engine detail

Engine Detail
John Deere
turbocharged diesel
liquid-cooled inline
Displacement: 496 ci
8.1 L
Bore/Stroke: 4.56×5.06 inches
116 x 129 mm
Rated Power (ECE R24): 270 hp
201.3 kW
Rated Power (EC 97/98): 284 hp
211.8 kW
Maximum Power (ECE R24): 300 hp
223.7 kW
Maximum Power (EC 97/68): 314 hp
234.1 kW
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

John Deere 8420T Transmission overview

Engine Oil

Transmission: John Deere PowerShift
Type: full power shift
Gears: 16 forward and 4 reverse
Oil capacity: 260 qts
246.1 L

John Deere 8420T Dimensions

Wheelbase: 89 inches
226 cm
  120 inches
304 cm (wide track opt)
Length: 207 inches
525 cm
  219.6 inches
557 cm (with front weights)
Width: 103.7 inches
263 cm (min)
  150 inches
381 cm (max)
Height (cab): 122.9 inches
312 cm
Clearance (rear axle): 21.7 inches
55 cm
Clearance (drawbar): 17.7 inches
44 cm

John Deere 8420T Weight
Shipping: 25,950 lbs
11770 kg
Operating: 26,380 lbs
11965 kg
Ballasted: 28,795 lbs
13061 kg
Max capacity: 31,500 lbs
14288 kg

John Deere 8420T Tests

OCED Tractor Test 1778

OCED Tractor Test 1778
Diesel 16-speed crawler
April 7 – 27, 2000
Link: OCED Tractor Test 1778 file
PTO performance
Max power: 270.62 hp
201.8 kW
Fuel use: 14.6 gal/hour
55.3 l/hour
Power at rated engine speed: 236.75 hp
176.5 kW
Fuel use: 13.7 gal/hour
51.9 l/hour
Drawbar performance
Max power: 205.84 hp
153.5 kW
Fuel use: 13.7 gal/hour
51.9 l/hour
Gear 10 used for power test.
Max pull: 27,233 lbs
12352 kg
Gear 3 used for pull test.


Is John Deere 8420T a good tractor?

The John Deere 8420T is one of the great tractors in the John Deere stable, and it has earned John Deere a fantastic reputation.

How much oil does a John Deere 8420T take?

Check out the John Deere 8420T oil capacity and oil type in the engine specs section as it may vary across the engines. Keep in mind, that older models might have their oil capacity increased over time. You may compare between the early and late oil capacity.

Do tractors have VIN numbers?

Every tractor has a VIN number. The number is usually engraved below the driver’s seat. Tractor manufacturers put the number in different places on the tractor body.

What was the last year John Deere made the 8320T

The John Deere 8420T was an agricultural tractor model made from 2002 – 2005

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