| Manufacturer | John Deere |
| Price | - |
| Model | 990 |
| Equipment Type | Compact Utility Tractors |
| Factory |
JOHN DEERE 990 POWER
| Engine (gross) | 40.4hp / 30.1kW |
| Engine (net) | 38.5hp / 28.7kW |
| PTO (claimed) | 35hp / 26.1kW |
ENGINE DETAIL
The John Deere 990 is powered by a Yanmar 4TNE84 diesel engine, providing a balance of power (40.4hp) and efficiency, suitable for light to moderate agricultural tasks. With a compression ratio of 18:1 and a rated RPM of 2700, the engine allows for efficient fuel combustion, though the dry air cleaner may necessitate regular maintenance to ensure optimal performance. The compact design, combined with manageable oil (5.6qts) and coolant capacities (6.1qts), makes this tractor relatively easy to service, ideal for small-scale farmers or hobbyists seeking reliable utility.
| Description | Yanmar 4TNE84 diesel 4-cylinder liquid-cooled |
| Displacement | 121.7ci / 2.0L |
| Bore/Stroke | 3.31x3.54inches / 84x 90mm |
| Power (gross) | 40.4hp / 30.1kW |
| Air cleaner | dry |
| Compression | 18:1 |
| Rated RPM | 2700 |
| Idle RPM | 925-2875 |
| Starter volts | 12 |
| Starter power | 2.7hp / 2.0kW |
| Oil capacity | 5.6qts / 5.3L |
| Coolant capacity | 6.1qts / 5.8L |
JOHN DEERE 990 ENGINE
The John Deere 990 tractor is powered by a Yanmar 2.0L 4-cylinder diesel engine, providing efficient torque and fuel economy for various agricultural tasks. Key advantages include its reliability and compatibility with a wide range of implements due to the Category 1 three-point hitch system. However, its lower horsepower may limit performance in heavier applications, making it more suitable for small to medium-sized farms or specific landscaping needs.
| Description | Yanmar 2.0L 4-cyl diesel |
TRANSMISSION
The John Deere 990 features a partially synchronized collar shift transmission with 9 forward and 3 reverse gears, allowing for efficient speed management in various field conditions. A notable advantage is the ability to shift between gears on the move using the clutch, enhancing productivity; however, operators must stop the tractor to shift between ranges, which can lead to downtime during work. The 22-quart oil capacity is sufficient for optimal lubrication, but maintaining proper oil levels is crucial to prevent transmission wear and ensure longevity of the system.
| Transmission | Collar Shift |
| Type | partially synchronized |
| Gears | 9 forward and 3 reverse |
| Oil capacity | 22qts / 20.8L |
| Description | Three gears (1-3) plus reverse in three ranges (A-C). Gears may be shifting on the move by using the clutch. The tractor must be stopped to shift ranges |
SPEEDS
| Description | With 14.9-24 rear tires |
MECHANICAL
The John Deere 990 offers a choice of 2WD or 4WD configurations, enhancing traction and stability in diverse terrains, but the 4WD variant may present higher initial costs and maintenance. Equipped with power steering and wet disc brakes, it ensures operator comfort and improved stopping power, particularly beneficial in rugged conditions. The 9-speed partially synchronized transmission allows for smoother gear changes, maximizing efficiency in various agricultural applications.
| Chassis | 4x2 2WD/4x4 MFWD 4WD |
| Steering | power |
| Brakes | wet disc |
| Cab | Two-post ROPS |
| Transmission | 9-speed partially synchronized |
CAPACITY
| Fuel | 8.5gal / 32.2L |
| Hydraulic system | 5.5gal / 20.8L |
HYDRAULICS
| Type | open center |
| Capacity | 5.5gal / 20.8L |
| Pressure | 2262psi / 156.0bar |
| Pump flow | 8.5gpm / 32.2lpm |
| Total flow | 13gpm / 49.2lpm |
| Steering flow | 4.5gpm / 17.0lpm |
TRACTOR HITCH
| Rear Type | I |
| Rear lift (at 24 | 1,573lbs / 713kg |
POWER TAKE-OFF (PTO)
| Rear PTO | live (two-stage clutch) |
| Rear RPM | 540 |
JOHN DEERE 990 TIRES
The John Deere 990 tractor offers options for both 2WD and 4WD configurations, which can enhance traction and stability based on terrain conditions; 4WD is advantageous for muddy or uneven surfaces. The tire specifications indicate a robust rear tire size (14.9-24), providing good flotation and reduced soil compaction, while front tire sizes vary (6.5-16 for 2WD and 8-16 for 4WD), impacting steering and load distribution. Selecting between 2WD and 4WD will depend on intended use: 2WD is generally more fuel-efficient for flat terrain, whereas 4WD is preferable for heavy-duty applications in variable conditions.
| 2WD Standard tires (ag) | Front: 6.5-16. Rear: 14.9-24 |
| 4WD Standard tires (ag) | Front: 8-16. Rear: 14.9-24 |
DIMENSIONS
| Wheelbase | 68.9inches / 175cm |
| Length | 123inches / 312cm |
| Height (hood) | 54inches / 137cm |
| Height (ROPS) | 84.2inches / 213cm |
| 2WD Front tread | 48.2inches / 122cm |
| 4WD Front tread | 53.6inches / 136cm |
| Rear tread | 46.2inches / 117cm |
JOHN DEERE 990 WEIGHT
| 2WD | 2594lbs / 1176kg |
| 4WD | 3175lbs / 1440kg |
| Max Drawbar | 825lbs / 374kg |
| Max front axle | 5513lbs / 2500kg |
| Max rear axle | 5292lbs / 2400kg |
DIMENSIONS & TIRES
The John Deere 990 tractor, with a wheelbase of 68.9 inches and a weight range of 2594 to 3175 pounds, offers high stability and traction for various agricultural applications. Its 6.5-16 front tires and 14.9-24 2WD rear tires are ideal for moderate loads, but the 2WD configuration may limit performance on uneven or slippery terrain. Perfect for flat fields, this tractor excels in smaller operations but may struggle in challenging conditions without the added advantage of 4WD.
| Wheelbase | 68.9inches / 175cm |
| Weight | 2594 to 3175 pounds |
| Front tire | 6.5-16 |
| 2WD Rear tire | 14.9-24 |
ATTACHMENT OVERVIEW
| Description | Front-end loader/Backhoe |
JOHN DEERE 430 LOADER
| Height (to pin) | 101.9inches / 258cm |
| Clearance, dumped bucket | 78.3inches / 198cm |
| Dump reach | 25.3inches / 64cm |
| Dump angle | 45° |
| Reach at ground | 51.2inches / 130cm |
| Rollback at ground | 30° |
| Rollback, raised | 64° |
| Breakout force (at pin) | 3,285lbs / 1490kg |
| Breakout force (at 500mm) | 2,306lbs / 1046kg |
| Lift to full height (at pin) | 1,102lbs / 499kg |
| Lift to full height (at 500mm) | 915lbs / 415kg |
| Lift to 1.5m (at pin) | 1,943lbs / 881kg |
| Lift to 1.5m (at 500mm) | 1,724lbs / 782kg |
| Bucket width | 61inches / 154cm |
| Raise time to height | 3.9 s |
| Bucket dump time | 1.8 s |
| Lowering time | 3.0 s |
| Rollback time | 2.2 s |
JOHN DEERE 8B BACKHOE
| Backhoe type | John Deere 8B Backhoe |
| Weight | 1260lbs / 571kg |
| Transport height | 81inches / 205cm |
| Bucket width | 12inches / 30cm 18inches / 45cm 24inches / 60cm 36inches / 91cm |
| Digging depth | 102inches / 259cm |
| Reach from pivot | 133inches / 337cm |
| Loading height | 82inches / 208cm |
| Bucket Rotation | 180 |
| Swing Arc | 180 |
| Bucket force | 2213lbs / 1003kg |
| Dipperstick force | 2213lbs / 1003kg |
990 SERIAL NUMBERS
| Location | Serial number plate on the rear of the 990, below the PTO |
| 2000 | 190001 |
| 2001 | 290002 |
| 2002 | 291001 |
| 2003 | 391001 |
| 2004 | 590001 |
| 2005 | 690001 |
| 2006 | 790001 |
| 2007 | 890001 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 20 |
| Battery CCA | 650 |
| Battery volts | 12 |