| Manufacturer | John Deere |
| Price | - |
| Model | 8120 |
| Equipment Type | Row-Crop Tractors |
| Factory | Waterloo, Iowa, USA |
OCED TRACTOR TEST 1819 2
| Description | Diesel 16-speed 4WD March 28 - April 8, 2003 Link: OCED Tractor Test 1819 file PTO performance Drawbar performance Gear 8 used for power test Gear 3 used for pull test |
| Max power | 148.45hp / 110.7kW |
| Fuel use | 10.2gal/hour / 38.6l/hour |
| Power at rated engine speed | 172.13hp / 128.4kW |
| Max pull | 22,308lbs / 10118kg |
JOHN DEERE 8120 POWER
| Engine (gross) | 208hp / 155.1kW |
| Engine (net) | 200hp / 149.1kW |
| Engine (max) | 230hp / 171.5kW |
| PTO (claimed) | 170hp / 126.8kW |
| Drawbar (tested) | 148.45hp / 110.7kW |
| PTO (tested) | 199.71hp / 148.9kW |
ENGINE DETAIL
The John Deere 8120, featuring a turbocharged 8.1L diesel engine, provides a rated power of 200hp and a max power of up to 230hp, making it suitable for heavy-duty tasks in agriculture or construction. Its electronic high-pressure common rail (HPCR) fuel system enhances fuel efficiency and reduces emissions, although it may require more advanced maintenance compared to older systems. The engine's robust compression ratio (16.5:1) and wide RPM range (900-2300 idle, 1500-2200 operating) allow for effective torque management, optimizing performance under various load conditions.
| Description | John Deere turbocharged diesel 6-cylinder liquid-cooled inline |
| Displacement | 496ci / 8.1L |
| Bore/Stroke | 4.56x5.06inches / 116x 129mm |
| Rated Power (ECE R24) | 200hp / 149.1kW |
| Rated Power (EC 97/98) | 208hp / 155.1kW |
| Maximum Power (ECE R24) | 220hp / 164.1kW |
| Maximum Power (EC 97/68) | 230hp / 171.5kW |
| Fuel system | electronic high-pressure common rail (HPCR) |
| Air cleaner | dry with secondary element |
| Compression | 16.5:1 |
| Rated RPM | 2200 |
| Idle RPM | 900-2300 |
| Operating RPM | 1500-2200 |
| Starter volts | 12 |
| Coolant capacity | 35.9qts / 34.0L |
ENGINE OIL
The John Deere 8120 has an oil capacity of 22.7 quarts (21.5 liters), allowing adequate lubrication for optimal engine performance. An oil change interval of 250 hours is advantageous for maintaining engine health, although it necessitates regular monitoring to avoid any potential buildup of contaminants that could impact efficiency. Operators should consider the impact of varied operating conditions on oil degradation to determine if more frequent changes are needed.
| Oil capacity | 22.7qts / 21.5L |
| Oil change | 250h |
JOHN DEERE 8120 ENGINE
The John Deere 8120 features an 8.1L 6-cylinder diesel engine, delivering robust power and torque, ideal for heavy-duty applications such as plowing and towing. Its advanced fuel injection system enhances fuel efficiency and reduces emissions, though potential challenges may include higher maintenance costs associated with the engine's complexity. This tractor is well-suited for large-scale agricultural operations where consistent performance and reliability are crucial.
| Description | John Deere 8.1L 6-cyl diesel |
TRANSMISSION
The John Deere 8120 features a full PowerShift transmission with 16 forward and 4 reverse gears, offering versatile operation suited for various agricultural tasks. The hydraulic wet disc clutch facilitates smooth shifting, while the Automatic PowerShift (APS) enhances efficiency by optimizing gear changes according to load. Key advantages include improved operator comfort and reduced fatigue, though the complexity of APS may challenge operators less familiar with advanced transmission systems.
| Transmission | John Deere PowerShift |
| Type | full power shift |
| Gears | 16 forward and 4 reverse |
| Clutch | hydraulic wet disc |
| Oil capacity | 148qts / 140.1L 158.4qts / 149.9L (ILS) |
| Description | 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 |
SPEEDS
| Description | With 18.4R46 rear tires |
MECHANICAL
The John Deere 8120 features a versatile 4x2 or 4x4 MFWD chassis, allowing flexibility for various terrains and conditions, with MFWD providing improved traction in challenging environments. Its hydrostatic power steering enhances maneuverability, making it ideal for precise applications such as row cropping or tillage. The 16-speed full power shift transmission enables seamless shifting under load, offering optimal performance and fuel efficiency, especially during field operations.
| Chassis | 4x2 2WD/4x4 MFWD 4WD |
| Steering | hydrostatic power |
| Brakes | hydraulic wet disc |
| Cab | Cab standard |
| Transmission | 16-speed full power shift |
CAPACITY
| Fuel | 135gal / 511.0L 160gal / 605.6L (optional) |
| Hydraulic system | 37gal / 140.0L 39.6gal / 149.9L (ILS) |
| Front hubs | 3.6qts / 3.4L 4.2qts / 4.0L (ILS) |
| Front diff | 14.2qts / 13.4L |
HYDRAULICS
| Type | closed center pressure-flow compensated (PFC) |
| Capacity | 37gal / 140.0L 39.6gal / 149.9L (ILS) |
| Pressure | 2900psi / 200.0bar |
| Valves | 5 |
| SCV flow | 30gpm / 113.6lpm |
| Total flow | 33.5gpm / 126.8lpm *With standard 45cc pump 42.5gpm / 160.9lpm 57cc pump |
TRACTOR HITCH
| Rear Type | III,IIIN |
| Rear lift | 12,300lbs / 5579kg 15,180lbs / 6885kg |
| Front Hitch | IIIN |
| Front lift | 11000lbs / 4989kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Clutch | hydraulic wet discs |
| Rear RPM | 1000 (1.75) 540/1000 (1.375 optional) |
| Engine RPM | 540@1975 / 1000@2200 |
JOHN DEERE 8120 TIRES
The John Deere 8120 is equipped with standard agricultural tires (11.00-24 front and 480/80R46 rear), providing robust traction and stability in field operations. The large rear tire size enhances soil compaction management and increases flotation on soft ground, making it suitable for various soil conditions. However, the front tire size may limit maneuverability in tight spaces, requiring careful assessment during row crop applications.
| Standard tires (ag) | Front: 11.00-24. Rear: 480/80R46 |
DIMENSIONS
| 2WD Wheelbase | 123.6inches / 313cm |
| 4WD Wheelbase | 116.9inches / 296cm |
| ILS Wheelbase | 115.7inches / 293cm 118.9inches / 302cm (long frame) |
| Length | 209.9inches / 533cm 211.9inches / 538cm (long frame) |
| Height (cab) | 120.2inches / 305cm |
| Front axle | MFWD ILS |
| Rear axle | Rack-and-pinion: 4.724 by 118.5inches / 119by 3009mm |
| 2WD Front tread | 60 to 88inches / 152to 223cm |
| 4WD Front tread | 60 to 80inches / 152to 203cm |
| ILS Front tread | 60 to 88inches / 152to 223cm |
JOHN DEERE 8120 WEIGHT
| Shipping | 19,100lbs / 8663kg (2WD) 21,050lbs / 9548kg (4WD) 21,650lbs / 9820kg (long frame) 22,450lbs / 10183kg (ILS) |
| Operating | 20,060lbs / 9099kg (4WD 480/80R46 duals) |
| Max Drawbar | 3,900lbs / 1769kg (Cat 3 extended) 6,070lbs / 2753kg (Cat 3 short) 10,000lbs / 4536kg (Cat 4) |
DIMENSIONS & TIRES
The John Deere 8120 tractor offers a versatile 2WD and 4WD configuration, with a weight range of 19,100 to 22,450 pounds which allows for effective field operations depending on soil conditions. The 4WD wheelbase of 116.9 inches promotes superior traction and stability, particularly in challenging terrains, while the ILS system provides enhanced ride comfort and reduced soil compaction. However, operators should be mindful of the higher operational costs associated with 4WD models and potential challenges in turning radius due to differing wheelbases.
| 2WD Wheelbase | 123.6inches / 313cm |
| 4WD Wheelbase | 116.9inches / 296cm |
| ILS Wheelbase | 115.7inches / 293cm 118.9inches / 302cm (long frame) |
| Weight | 19100 to 22450 pounds |
| Front tire | 11.00-24 |
| Rear tire | 480/80R46 |
8120 SERIAL NUMBERS
| Location | Rear of tractor |
| 2002 | 1001 |
| 2003 | 10001 |
| 2004 | 20001 |
| 2005 | 30001 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 150 |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |