The Oliver 990 is a 2WD standard-tread tractor from the 900 series. This tractor was manufactured by Oliver in Charles City, Iowa, USA from 1958 to 1961. The Oliver 990 is equipped with a 3.5 L (213.0 cu·in) three-cylinder diesel engine and a gear type transmission with 6 forward and 2 reverse gears.
The Oliver 990 standard-tread tractor used the General Motors 3-71 engine. It is a 3.5 L, 3,490 cm2, (213.0 cu·in) three-cylinder natural aspirated diesel engine with 108.0 mm (4.25 in) of the cylinder bore and 127.0 mm (5 in) of the piston stroke. The compression ratio rating is 17.0:1. This engine produced 62.3 PS (45.8 kW; 61.4 HP) at 1800 rpm of output power.
The Oliver 990 is equipped with power steering, disc brakes, and an open operator station.
Oliver 990 Specifications
| General Specifications | |
| Model | Oliver 990 |
| Length | – |
| Width | – |
| Height | – |
| Wheel base | 2,020 mm (79.5 in) |
| Weight | 4,989 kg (10,999 lbs) |
| Fuel tank capacity | – |
| Battery | – |
| Cabin type | Open operator station |
| Engine | |
| Engine model | General Motors 3-71 |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 3 |
| Fuel type | Diesel |
| Displacement | 3.5 L, 3,490 cm2, (213.0 cu·in) |
| Bore and stroke | 108.0 mm X 127.0 mm (4.25 in X 5 in) |
| Compression ratio | 17.0:1 |
| Horsepower | 62.3 PS (45.8 kW; 61.4 HP) at 1800 rpm |
| Starter | Electric |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | Power |
| Brakes | Disc |
| Transmission model | – |
| Transmission type | Gear type with dry disc clutch |
| Gears | 6 forward and 2 reverse |
| Speed | Forward: 19.6 kmh (12.2 mph) Reverse: 7.4 kmh (4.6 mph) |
| Tires | |
| Front tires | Ag: 7.50-18 |
| Rear tires | Ag: 18-26, 14-34, 15-34 |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent |
| Rear PTO speed | 540 rpm |
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