John Deere

John Deere 8120

The John Deere 8120 is a row-crop 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 230 hp gross power. The tractor offers a 16-speed full power shift transmission with hydraulic wet disc clutch and is available in two- or four-wheel drive configurations. It includes a hydrostatic power steering system, hydraulic wet disc brakes, and a standard cab. The 8120 supports a variety of hydraulic and hitch capacities, including a rear lift capacity up to 15,180 lbs optional and front lift of 11,000 lbs. Fuel capacity ranges from 135 to 160 gallons. The tractor's dimensions and weight vary by configuration, with wheelbases from 115.7 to 123.6 inches and shipping weights from 19,100 to 22,450 lbs. Electrical system features a 12-volt negative ground with two batteries and 150 amp alternator. The 8120 is succeeded by the John Deere 8130 and related to models 8110 and 8220.

Power208 hp

Founded2002 - 2005

Model8120

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Technical Specifications

Detailed specifications and technical data for John Deere 8120

Power

Engine (max)	230 hp (171.5 kW)
Engine (net)	200 hp (149.1 kW)
PTO (tested)	199.71 hp (148.9 kW)
PTO (claimed)	170 hp (126.8 kW)
Engine (gross)	208 hp (155.1 kW)
Drawbar (tested)	148.45 hp (110.7 kW)

Engine

Type	turbocharged diesel
Model	John Deere 8.1L 6-cyl diesel
Idle RPM	900-2300
Cylinders	6-cylinder
Rated RPM	2200
Air cleaner	dry with secondary element
Bore/Stroke	4.56x5.06 inches (116 x 129 mm)
Fuel system	electronic high-pressure common rail (HPCR)
Displacement	496 ci (8.1 L)
Oil capacity	22.7 qts (21.5 L)
Configuration	liquid-cooled inline
Operating RPM	1500-2200
Starter volts	12
Coolant capacity	35.9 qts (34.0 L)
Compression ratio	16.5:1
Rated Power (net)	200 hp (149.1 kW)
Maximum Power (net)	220 hp (164.1 kW)
Oil change interval	250 h
Rated Power (gross)	208 hp (155.1 kW)
Maximum Power (gross)	230 hp (171.5 kW)

Weight

Shipping	19,100 lbs (2WD) (8663 kg), 21,050 lbs (4WD) (9548 kg), 21,650 lbs (long frame) (9820 kg), 22,450 lbs (ILS) (10183 kg)
Operating	20,060 lbs (4WD 480/80R46 duals) (9099 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)

Capacity

Fuel	135 gal (511.0 L), 160 gal (optional) (605.6 L)
Front hubs	3.6 qts (3.4 L), 4.2 qts (ILS) (4.0 L)
Front diff.	14.2 qts (13.4 L)
Hydraulic system	37 gal (140.0 L), 39.6 gal (ILS) (149.9 L)

Variants

8120	wheeled tractor
8120T	crawler

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	37 gal (140.0 L), 39.6 gal (ILS) (149.9 L)
Pressure	2900 psi (200.0 bar)
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

Mechanical

Cab	standard
Drive	Two- or four-wheel drive
Brakes	Hydraulic wet disc brakes
Steering	hydrostatic power

Production

Type	Row-Crop tractor
Series	8020 Series
Built in	Waterloo, Iowa, USA
Years produced	2002 - 2005

Transmission

Type	John Deere PowerShift
Gears	16 forward and 4 reverse
Clutch	hydraulic wet disc
Features	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.
Oil capacity	148 qts (140.1 L), 158.4 qts (ILS) (149.9 L)
Full power shift	yes

Tractor hitch

Rear Type	III, IIIN
Rear lift	12,300 lbs (5579 kg), 15,180 lbs (optional) (6885 kg)
Front lift	11000 lbs (4989 kg)
Front Hitch	IIIN (optional)

Serial Numbers

2002	1001
2003	10001
2004	20001
2005	30001

Dimensions & Tires

Length	209.9 inches (533 cm), 211.9 inches (long frame) (538 cm)
Weight	19100 to 22450 pounds
Front axle	2WD, MFWD, MFWD ILS
Height (cab)	120.2 inches (305 cm)
2WD Wheelbase	123.6 inches (313 cm)
4WD Wheelbase	116.9 inches (296 cm)
ILS Wheelbase	115.7 inches (293 cm), 118.9 inches (long frame) (302 cm)
2WD Front tread	60 to 88 inches (152 to 223 cm)
4WD Front tread	60 to 80 inches (152 to 203 cm)
ILS Front tread	60 to 88 inches (152 to 223 cm)
Standard tires (ag)	Front: 11.00-24. Rear: 480/80R46
Rack-and-pinion rear axle	3.937 by 110.5 inches (99 by 2806 mm), 3.937 by 118.5 inches (99 by 3009 mm), 4.331 by 118.5 inches (110 by 3009 mm), 4.724 by 118.5 inches (119 by 3009 mm)