John Deere 8120

Name: John Deere 8120
Brand: John Deere

Power

208 hp

Production

2002-2005

Transmission

John Deere PowerShift

Drive

2WD/4WD

Over 200 HP 2000s

From the same series:

8220

Introduction

John Deere 8120 Row-Crop Tractor

The John Deere 8120 is a high-horsepower row-crop tractor produced between 2002 and 2005 at the Waterloo, Iowa, facility. It serves as a core model in the 8000 series, designed for heavy-duty field operations and demanding agricultural tasks.

Engine and Performance

The tractor is powered by an 8.1-liter, liquid-cooled inline engine featuring an electronic high-pressure common rail (HPCR) fuel system. It provides a rated net power of 200 hp (149.1 kW) and a maximum net power of 220 hp (164.1 kW). The engine operates optimally between 1500 and 2200 RPM, supported by a displacement of 496 cubic inches.

Transmission and Drivetrain

Equipped with the John Deere PowerShift transmission, the machine offers 16 forward and 4 reverse gears. This full power shift system utilizes hydraulic wet disc clutches and includes an Automatic PowerShift (APS) feature, which adjusts shifting based on load requirements. The tractor is available in two-wheel drive, MFWD, or MFWD with Independent Link Suspension (ILS).

Hydraulics and Hitch

The hydraulic system is a closed-center, pressure-flow compensated (PFC) design delivering a standard flow of 33.5 gpm (126.8 lpm), with an optional upgrade to 42.5 gpm (160.9 lpm). It supports up to five valves. The rear hitch is a category III/IIIN type with a lift capacity of 12,300 lbs (5579 kg), while an optional front hitch is capable of lifting 11,000 lbs (4989 kg).

PTO and Electrical

The 8120 features an independent rear PTO. It offers standard speeds of 540 RPM at 1975 engine RPM and 1000 RPM at 2200 engine RPM. The electrical system operates on 12 volts, utilizing a dual-battery configuration with a 925 cold-cranking amps capacity, managed by a 150-amp charging system.

Conclusion

"The John Deere 8120 is a robust, versatile tractor engineered for large-scale farming applications. Its combination of a high-torque engine, sophisticated power shift transmission, and high-capacity hydraulic output makes it suitable for intensive tillage, planting, and heavy implement management."

Introduction

Production Information of John Deere, 8120

The production information of the tractor (8120) includes details about its manufacturing.

Row-Crop tractor

Built in Waterloo, Iowa, USA


Manufacturer	John Deere

Dimension and Tires Information of John Deere, 8120

This section sums up the dimension and tires information of the tractor.


2WD Wheelbase	123.6 inches [313 cm]
4WD Front tread	60 to 80 inches [152 to 203 cm]
2WD Front tread	60 to 88 inches [152 to 223 cm]
	118.9 inches (long frame) [302 cm]
Front axle	2WD
ILS Front tread	60 to 88 inches [152 to 223 cm]
ILS Wheelbase	115.7 inches [293 cm]
Rack-and-pinion rear axle	3.937 by 110.5 inches [99 by 2806 mm]
Front axle	MFWD
Length	209.9 inches [533 cm]
Height (cab)	120.2 inches [305 cm]
4WD Wheelbase	116.9 inches [296 cm]
Rack-and-pinion rear axle	4.724 by 118.5 inches [119 by 3009 mm]
	211.9 inches (long frame) [538 cm]
Front axle	MFWD ILS
Rack-and-pinion rear axle	4.331 by 118.5 inches [110 by 3009 mm]
Rack-and-pinion rear axle	3.937 by 118.5 inches [99 by 3009 mm]


Standard tires (ag)	Front: 11.00-24. Rear: 480/80R46

Engine Specifications of John Deere, 8120

Get the specifications for the engine and if different options are available.

Liquid-cooled inline


Operating RPM	1500-2200
Idle RPM	900-2300
Rated Power (gross)	208 hp [155.1 kW]
Starter volts	12
Maximum Power (gross)	230 hp [171.5 kW]
Fuel system	Electronic high-pressure common rail (HPCR)
Maximum Power (net)	220 hp [164.1 kW]
Displacement	496 ci [8.1 L]
Rated Power (net)	200 hp [149.1 kW]
Oil capacity	22.7 qts [21.5 L]
Oil change	250 h
Bore/Stroke	4.56x5.06 inches [116 x 129 mm]
Rated RPM	2200
Coolant capacity	35.9 qts [34.0 L]
Compression	16.5:1
Air cleaner	Dry with secondary element

Transmission Information of John Deere, 8120Y

Discover all variants of transmission available for this tractor model.

Transmission variants 1

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.


Transmission	John Deere PowerShift
Oil capacity	148 qts [140.1 L]
Clutch	Hydraulic wet disc
Type	Full power shift
	158.4 qts (ILS) [149.9 L]
Gears	16 forward and 4 reverse

Mechanical Specs of John Deere, 8120Y

This section summarizes all mechanical information such as the brake system and other specifications.

Two- or four-wheel drive

Cab standard.

Hydraulic wet disc brakes


Steering	Hydrostatic power

Power Information of John Deere, 8120Y

Discover the power specifications and options available for this tractor model but also PTO (Power Take-off) information.


Rear PTO	Independent
Engine RPM	540@1975
	540/1000 (1.375 optional)
Clutch	Hydraulic wet discs
	1000@2200
Rear PTO Type	1000 (1.75)

Hydraulics Specifications of John Deere, 8120

Hydraulic system type, pressure, pump flow and valves.


Total flow	33.5 gpm*With standard 45cc pump [126.8 lpm]
Type	Closed center pressure-flow compensated (PFC)
Valves	5
Pressure	2900 psi [200.0 bar]
Capacity	37 gal [140.0 L]
	42.5 gpm*Optional 57cc pump [160.9 lpm]
SCV flow	30 gpm [113.6 lpm]
	39.6 gal (ILS) [149.9 L]

Three-Point Hitch of John Deere, 8120

Hitch category and rear/front lift capacity.


Rear Type	III,IIIN
Front lift	11000 lbs [4989 kg]
Front Hitch	IIIN OptOptional
Rear lift	12,300 lbs [5579 kg]
	15,180 lbsOptOptional [6885 kg]

Electrical System of John Deere, 8120

Battery voltage, charging system and ground.


Ground	Negative
Battery CCA	925
Batteries	2
Charging system	Alternator
Battery volts	12
Charging amps	150

Frequently asked questions

How much horsepower does the John Deere 8120 have?

The John Deere 8120 delivers 208 HP.

What years was the John Deere 8120 produced?

The John Deere 8120 was produced in 2002-2005.

What transmission does the John Deere 8120 use?

The John Deere 8120 uses a John Deere PowerShift transmission.

Is the John Deere 8120 4WD?

The John Deere 8120 is available in 2WD/4WD.

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