| Manufacturer | John Deere |
| Price | - |
| Model | 9120 |
| Equipment Type | Four-wheel Drive 4WD Tractors |
| Factory | Waterloo, Iowa, USA |
OCED TRACTOR TEST 1810 2
| Description | Diesel 18-speed 4WD September 23 - 27, 2002 Link: OCED Tractor Test 1810 file PTO performance Drawbar performance Gear 7 used for power test Gear 1 used for pull test |
| Power at rated engine speed | 244.57hp / 182.4kW |
| Fuel use | 14.5gal/hour / 54.9l/hour |
| Power at rated PTO speed | 262.97hp / 196.1kW |
| Max power | 226.02hp / 168.5kW |
| Max pull | 35,211lbs / 15971kg |
JOHN DEERE 9120 POWER
| Engine | 280hp / 208.8kW |
| PTO (claimed) | 230hp / 171.5kW |
| Drawbar (tested) | 226.02hp / 168.5kW |
| PTO (tested) | 244.57hp / 182.4kW |
ENGINE DETAIL
The John Deere 9120 is equipped with a robust turbocharged 6-cylinder diesel engine with 496ci displacement, delivering 280hp at a rated RPM of 2100, ideal for intensive agricultural operations. Its dry air cleaner and high compression ratio of 16.0:1 enhance performance and fuel efficiency, though maintenance of the air filter is crucial to maintain optimal airflow. With a coolant capacity of 55 quarts, it effectively manages heat during prolonged usage, making it suitable for tasks requiring sustained power output in challenging conditions.
| Description | John Deere turbocharged diesel 6-cylinder liquid-cooled |
| Displacement | 496ci / 8.1L |
| Bore/Stroke | 4.56x5.06inches / 116x 129mm |
| Power | 280hp / 208.8kW |
| Air cleaner | dry |
| Compression | 16.0:1 |
| Rated RPM | 2100 |
| Starter volts | 12 |
| Coolant capacity | 55qts / 52.1L |
ENGINE OIL
The John Deere 9120 tractor has an oil capacity of 28 quarts (26.5 liters), which is essential for ensuring optimal engine lubrication and performance. Regular oil changes and maintaining the correct oil level can enhance engine longevity and efficiency under heavy-duty farm operations. However, the relatively high oil capacity requires diligent monitoring to prevent neglect, which could lead to increased wear and operational issues over time.
| Oil capacity | 28qts / 26.5L |
JOHN DEERE 9120 ENGINE
The John Deere 9120 is equipped with an 8.1L 6-cylinder diesel engine, which provides a robust power output ideal for heavy-duty agricultural applications. Its high torque characteristics enhance pulling capability, particularly beneficial for tasks such as plowing and tilling. However, operators should consider fuel efficiency and maintenance costs associated with larger diesel engines in long-term operations.
| Description | John Deere 8.1L 6-cyl diesel |
TRANSMISSIONS OVERVIEW
The John Deere 9120 tractor features a 24-speed partial power shift transmission, allowing for smooth gear transitions while maintaining engine power and torque, ideal for varied field conditions. In contrast, the 18-speed full power shift enhances operational efficiency during heavy-duty tasks by enabling clutch-less shifting under load, maximizing productivity on the go. Key advantages include reduced operator fatigue from decreased manual shifting and improved fuel efficiency, while potential challenges may arise from the complexity of the transmission systems requiring skilled operators for optimal performance.
| Description | 24-speed partial power shift 18-speed full power shift |
TRANSMISSION 1
The John Deere 9120 utilizes the PowerSync partial power shift transmission, offering 24 forward and 6 reverse gears across four ranges. The synchronized shifting capability enhances operational efficiency, allowing seamless transitions between ranges and gears, though it limits reverse operation in D range, which can be a challenge in tight maneuvering scenarios. With an oil capacity of up to 140 quarts when using the PTO, adequate maintenance is essential for optimal performance and longevity.
| Transmission | John Deere PowerSync |
| Type | partial power shift |
| Gears | 24 forward and 6 reverse |
| Oil capacity | 136qts / 128.7L 140qts / 132.5L (with PTO) |
| Description | Four ranges (A-D) and three gears (1-3) with high-low power shift. Synchronized shifting between ranges A-B, B-C, and C-D. Gear shifts are synchronized between 1-R, 1-2, and 2-3. Reverse gear does not operate in D range |
SPEEDS 1
| Description | With 20.8R42 tires |
TRANSMISSION 2
The John Deere 9120's full Powershift transmission offers seamless gear changes across 18 forward and 6 reverse gears, enhancing operational efficiency in varied field conditions. This allows for optimal torque management, making it suitable for tasks requiring both high power and precision, such as tillage and hauling. However, the complexity of the Powershift system may pose maintenance challenges over time, necessitating knowledgeable service personnel for repairs.
| Transmission | John Deere Powershift |
| Type | full power shift |
| Gears | 18 forward and 6 reverse |
SPEEDS 2
| Description | With 20.8R42 tires |
MECHANICAL
The John Deere 9120 features a robust 4x4 articulated 4WD chassis, providing excellent traction and stability, ideal for both farming and heavy-duty applications. Its hydrostatic articulated steering enhances maneuverability in tight spaces, while the hydraulic wet disc brakes ensure reliable stopping power, even in challenging conditions. The CommandView cab with air-conditioning ensures operator comfort during long hours, and the choice between 18-speed full power shift and 24-speed partial power shift transmissions allows for precise control in varying field conditions.
| Chassis | 4x4 articulated 4WD |
| Steering | hydrostatic articulated |
| Brakes | hydraulic wet disc |
| Cab | CommandView cab standard with air-conditioning |
| Transmissions | 24-speed partial power shift 18-speed full power shift |
CAPACITY
| Fuel | 270gal / 1022.0L |
| Hydraulic system | 27gal / 102.2L 28gal / 106.0L (with 3pt) |
HYDRAULICS
| Type | closed center pressure flow compensated |
| Capacity | 27gal / 102.2L 28gal / 106.0L (with 3pt) |
| Pressure | 2900psi / 200.0bar |
| Valves | 4 or 5 |
| Pump flow | 30gpm / 113.6lpm |
| Total flow | 44gpm / 166.5lpm 48gpm / 181.7lpm (Powershift) |
TRACTOR HITCH
| Rear Type | III/IV/IVN |
| Rear lift | 13,871lbs / 6291kg 14,445lbs / 6552kg (optional) |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 1000 |
JOHN DEERE 9120 TIRES
The John Deere 9120, equipped with 20.8R42 tires both front and rear, offers optimal traction and stability, particularly in heavy tillage and large-scale farming operations. However, the wide tire profile may require careful consideration of soil compaction and field conditions to prevent suboptimal performance. Additionally, the 9120's high horsepower makes it well-suited for power-intensive applications, though it may lead to increased fuel consumption.
| Ag front | 20.8R42 |
| Ag rear | 20.8R42 |
DIMENSIONS
| Wheelbase | 137.8inches / 350cm |
| Length | 274inches / 695cm 289inches / 734cm (with hitch) |
| Width | 115.5inches / 293cm |
| Shipping weight | 30,970lbs / 14047kg |
| Operating weight | 35,375lbs / 16046kg (620/70R46 duals) |
| Clearance (front axle) | 26.8inches / 68cm |
| Clearance (drawbar) | 15inches / 38cm |
JOHN DEERE 9120 HEIGHT
| Hood | 97.5inches / 247cm |
| Cab | 137.5inches / 349cm |
| Exhaust | 140inches / 355cm |
DIMENSIONS & TIRES
The John Deere 9120 features a substantial wheelbase of 137.8 inches (350 cm), which enhances stability and traction on uneven terrain, beneficial for heavy-duty agricultural tasks. The weight range of 30,970 to 35,375 pounds allows for a robust frame capable of supporting various implements, though it may pose challenges in maneuverability on soft soils. The use of 20.8R42 tires provides excellent flotation and grip, but tire maintenance and replacement costs should be considered, especially when working in diverse conditions.
| Wheelbase | 137.8inches / 350cm |
| Weight | 30970 to 35375 pounds |
| Front tire | 20.8R42 |
| Rear tire | 20.8R42 |
9120 SERIAL NUMBERS
| Location | On the top-left of rear hinge member |
| 2002 | 1001 |
| 2003 | 10001 |
| 2004 | 20001 |
| 2005 | 30001 |
| 2006 | 40001 |
| 2007 | 50001 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 140 |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |