John Deere

John Deere 8420T

The John Deere 8420T is an agricultural crawler tractor produced from 2002 to 2005 as part of the 8020 Series. It features a John Deere 8.1L 6-cylinder turbocharged diesel engine delivering up to 314 hp gross power. The tractor uses a 16-speed full power shift John Deere PowerShift transmission and has electro-hydraulic power steering with hydraulic wet disc brakes. It has a fuel capacity of 130 gallons and a hydraulic system capacity of 65 gallons. The 8420T rides on 24-inch tracks and offers a rear hitch lift capacity of 15,180 lbs. Dimensions include a wheelbase of 89 inches, length of 207 inches, and a cab height of 122.9 inches. The tractor weighs between 25,950 and 28,795 lbs depending on configuration. Electrical system includes a 150 amp alternator and two 12-volt batteries.

Power284 hp

Founded2002 - 2005

Model8420T

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Technical Specifications

Detailed specifications and technical data for John Deere 8420T

Power

Engine (max)	314 hp (234.1 kW)
Engine (net)	270 hp (201.3 kW)
PTO (tested)	270.62 hp (201.8 kW)
PTO (claimed)	235 hp (175.2 kW)
Engine (gross)	284 hp (211.8 kW)
Drawbar (tested)	205.84 hp (153.5 kW)

Engine

Type	turbocharged diesel
Model	John Deere 8.1L 6-cyl diesel
Cooling	liquid-cooled inline
Idle RPM	900-2300
Cylinders	6-cylinder
Rated RPM	2200
Bore/Stroke	4.56x5.06 inches (116 x 129 mm)
Compression	16.5:1
Displacement	496 ci (8.1 L)
Oil capacity	22.7 qts (21.5 L)
Operating RPM	1500-2200
Starter volts	12
Coolant capacity	35.9 qts (34.0 L)
Rated Power (net)	270 hp (201.3 kW)
Maximum Power (net)	300 hp (223.7 kW)
Oil change interval	250 h
Rated Power (gross)	284 hp (211.8 kW)
Maximum Power (gross)	314 hp (234.1 kW)

Tracks

16-inch width	16 inches (40 cm)
18-inch width	18 inches (45 cm)
24-inch width	24 inches (60 cm)
30-inch width	30 inches (76 cm)
16-inch area on ground	2848 in² (1.8 m²)
18-inch area on ground	3204 in² (2.1 m²)
24-inch area on ground	4272 in² (2.8 m²)
30-inch area on ground	5340 in² (3.4 m²)
16-inch length on ground	89 inches (226 cm)
18-inch length on ground	89 inches (226 cm)
24-inch length on ground	89 inches (226 cm)
30-inch length on ground	89 inches (226 cm)

Weight

Shipping	25,950 lbs (11770 kg)
Ballasted	28,795 lbs (13061 kg)
Operating	26,380 lbs (11965 kg)
Max capacity	31,500 lbs (14288 kg)

Capacity

Fuel	130 gal (492.1 L)
Hydraulic system	65 gal (246.0 L)

Electrical

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

Hydraulics

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

Mechanical

Cab	standard
Drive	crawler
Brakes	Hydraulic wet disc brakes
Steering	electro-hydraulic power

Production

Type	Agricultural Crawler tractor
Series	8020 Series
Built in	Waterloo, Iowa, USA
Years produced	2002 - 2005

Transmission

Type	John Deere PowerShift
Gears	16 forward and 4 reverse
Notes	Fourth reverse at 1600 RPM.
Shift	full power shift
Oil capacity	260 qts (246.1 L)

Tractor hitch

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

Dimensions & Tracks

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