John Deere 8120
Power
208 hp
Production
2002-2005
Transmission
John Deere PowerShift
Drive
2WD/4WD
From the same series:
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.
Production Information of John Deere, 8120
- Row-Crop tractor
- Built in Waterloo, Iowa, USA
| Manufacturer | John Deere |
|---|
Dimension and Tires Information of John Deere, 8120
| 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] |
| 2WD Front tread(optional) | 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] |
| Rack-and-pinion rear axle(optional) | 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
- 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, 8120
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 |
| Type(optional) | 158.4 qts (ILS) [149.9 L] |
| Gears | 16 forward and 4 reverse |
Mechanical Specs of John Deere, 8120
- Two- or four-wheel drive
- Cab standard.
- Hydraulic wet disc brakes
| Steering | Hydrostatic power |
|---|
Power Information of John Deere, 8120
| Rear PTO | Independent |
|---|---|
| Engine RPM | 540@1975 |
| Engine RPM(optional) | 540/1000 (1.375 optional) |
| Clutch | Hydraulic wet discs |
| Clutch(optional) | 1000@2200 |
| Rear PTO Type | 1000 (1.75) |
Hydraulics Specifications of John Deere, 8120
| Total flow | 33.5 gpm [126.8 lpm] |
|---|---|
| Type | Closed center pressure-flow compensated (PFC) |
| Valves | 5 |
| Pressure | 2900 psi [200.0 bar] |
| Capacity | 37 gal [140.0 L] |
| Capacity(optional) | 42.5 gpm [160.9 lpm] |
| SCV flow | 30 gpm [113.6 lpm] |
| SCV flow(optional) | 39.6 gal (ILS) [149.9 L] |
With standard 45cc pump
Optional 57cc pump
Three-Point Hitch of John Deere, 8120
| Rear Type | III,IIIN |
|---|---|
| Front lift | 11000 lbs [4989 kg] |
| Front Hitch(optional) | IIIN |
| Rear lift | 12,300 lbs [5579 kg] |
| Rear lift(optional) | 15,180 lbs [6885 kg] |
Electrical System of John Deere, 8120
| Ground | Negative |
|---|---|
| Battery CCA | 925 |
| Batteries | 2 |
| Charging system | Alternator |
| Battery volts | 12 |
| Charging amps | 150 |
Where it sits
With 208 HP, the John Deere 8120 sits between 8110 (183 HP) and 8130 (225 HP) in John Deere's range. Its power puts it in the 88th percentile of 2000s models in our database (2822 machines).
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.