John Deere 8120

Last Updated: July 2024

Overview

The John Deere 8120 row-crop tractor is a versatile machine that was manufactured by John Deere in the United States between 2002 and 2005. The 8120 is offered with either a 2WD or advanced 4WD system, complemented by John Deere's ILS system for improved traction and ride quality. The tractor is powered by a reliable John Deere 6-cylinder turbocharged diesel engine, offering a displacement of 496 ci, which translates to considerable power for a range of agricultural tasks. With hydrostatic power steering and hydraulic wet disc brakes, the 8120 ensures smooth operation and control. The tractor also features a cabin for operator comfort and is equipped with a Category IIIN three-point hitch capable of handling substantial loads. Transmission-wise, the John Deere PowerShift provides flexibility with its 16 forward and 4 reverse gears, suitable for various farming applications.

Key Specifications

Category: Row Crop

Power Output: ECE R24: 200, EC 97/98: 208, Maximum Power ECE R24: 220, Maximum Power EC 97/68: 230, Nebraska Test: 172.13 at 2201 rpm (rated), 199.71 at 1900 rpm (maximum)

Transmission: Full power shift

Drive Type: 4x2 (2WD), 4x4 MFWD ILS (4WD)

Operating Weight: 19,105 (2WD), 20,060 (4WD 480/80R46 duals)

Fuel Type: Diesel

Technical Specifications

Engine

Manufacturer: John Deere
Model: -
Cooling Type: Liquid-cooled
Cylinder Orientation: Inline
Valve Configuration: -
Fuel Type: Diesel
Induction Type: Turbocharged
Cylinders: 6
Displacement (ci): 496
Bore (in): 4.56
Stroke (in): 5.06
Rated RPM: 2200
Power Output (hp): ECE R24: 200, EC 97/98: 208, Maximum Power ECE R24: 220, Maximum Power EC 97/68: 230, Nebraska Test: 172.13 at 2201 rpm (rated), 199.71 at 1900 rpm (maximum)

Transmission

Type: Full power shift
Forward Gears: 16
Reverse Gears: 4
Total Gears: -

Dimensions

Length (in): 209.9
Width (in): -
Height (in): 120.2
Operating Weight (lb): 19,105 (2WD), 20,060 (4WD 480/80R46 duals)

Power Take-Off (PTO)

PTO Type: Independent
PTO Speed 1 (rpm): 540/1000
PTO Speed 2 (rpm): 1000
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: -
Drive Type: 4x2 (2WD), 4x4 MFWD ILS (4WD)
Steering Type: Hydrostatic power
Coolant Capacity (qts): 35.9
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): -
Tire Type: Ag
Manufacture - End Year: 2005
Hitch Type: III/IIIN
Hitch Category: IIIN
Hitch Position: Rear
Hitch Capacity (lb): 12,353 (standard), 15,387 (high flow option)
Operator Station Type: Cab (standard)
Starter Type: Electric
Brake Type: Hydraulic wet disc
Hydraulic System Type: Closed center pressure-flow compensated (PFC)

Test Results

Nebraska Tractor Test Laboratory - Test Date: March 28 to April 8, 2003

Maximum Power and Fuel Consumption

Rated Engine Speed (PTO speed—1010 rpm): 172.13 HP (128.36 kW) at 2201 rpm
Maximum Power (2 hours): 199.71 HP (148.93 kW) at 1900 rpm
Fuel Consumption at Maximum Power: 10.49 Gal/hr (39.69 l/h) with a fuel efficiency of 0.367 lb/hp.hr (0.223 kg/kW.h)

Drawbar Performance

Maximum Power (8th Gear): 148.45 HP (110.70 kW) with a drawbar pull of 11560 lbs (51.42 kN) and a speed of 4.82 mph (7.75 km/h)
Fuel Consumption at Maximum Drawbar Power: 0.480 lb/hp.hr (0.292 kg/kW.h) with a fuel efficiency of 14.58 Hp.hr/gal (2.87 kW.h/l)
Maximum Torque: 632 lb.-ft. (857 Nm) at 1400 rpm
Torque Rise: 53.6%

Hydraulic Performance

Maximum Force Exerted Through Whole Range: 12,353 lbs (54.9 kN) for standard lift cylinders, 15,387 lbs (68.4 kN) for high flow option
Pump Delivery Rate at Minimum Pressure (standard): 35.2 GPM (133.2 l/min)
Pump Delivery Rate at Maximum Hydraulic Power (high flow option): 42.4 GPM (160.5 l/min) with a hydraulic power output of 61.9 HP (46.2 kW) at a delivery pressure of 2504 psi (173 bar)

Overall Efficiency

Fuel Efficiency at Standard PTO Speed (1000 rpm): 17.03 Hp.hr/gal (3.35 kW.h/l) at 2201 rpm
Fuel Consumption at Varying Power and Speed: Varies between 2.96 Gal/hr (11.20 l/h) to 10.11 Gal/hr (38.27 l/h) depending on power output and engine speed

NTTL.(2003).Nebraska OECD Tractor Test 1819 for John Deere 8120 Diesel 16-Speed. Lincoln, NE:Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/2163