Overview
The Oliver 990 is a standard-tread farm tractor produced in Charles City, Iowa, between 1958 and 1961 with an original list price of $8,200. This model is equipped with a General Motors 3.5L three-cylinder two-cycle diesel engine and a six-speed gear transmission, providing a tested belt power of 84.10 hp.
Ideal Applications
Tested Drawbar and Pull Capacity:
In Nebraska Tractor Test 661, the 990 achieved a maximum drawbar power of 61.46 hp and a maximum pull of 12,629 lbs using the first gear setting.
Engine and Mechanical Configuration:
The tractor features a blower-equipped liquid-cooled diesel engine with a 17:1 compression ratio, 213 cubic inch displacement, and 12-volt starter system.
Belt Pulley and PTO Specifications:
The mechanical setup includes a 12.25-inch diameter belt pulley rated at 1021 RPM and an optional independent 540 RPM rear PTO.
Production
| Description | Standard-tread tractor / Built in Charles City, Iowa, USA / Original price was $8,200 in 1961 / The Oliver 990 was also sold as the Massey Ferguson 98 (with different sheet metal, paint, and seat). |
|---|---|
| Manufacturer | Oliver |
Engine
| Engine type | General Motors 3.5L 3-cyl diesel |
|---|---|
| Bore/Stroke | 4.25x5.00 inches (108 x 127 mm) |
| Compression | 17:1 |
| Description | General Motors 3-71 / blower diesel / 3-cylinder / liquid-cooled / two-cycle engine with mechanical blower |
| Displacement | 213 ci (3.5 L) |
| Rated RPM | 1800 |
| Starter volts | 12 |
| Belt (tested) | 84.10 hp (62.7 kW) |
| Drawbar (claimed) | 61.4 hp (45.8 kW) |
| Drawbar (tested) | 61.46 hp (45.8 kW) |
| Plows | 6 |
| PTO (claimed) | 84.1 hp (62.7 kW) |
Transmission
| Clutch | dry disc |
|---|---|
| Gears | 6 forward and 2 reverse |
| Transmission type | 6-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Disc brakes |
| Drive type | Two-wheel drive |
| Steering | power |
PTO
| Rear PTO | independent OptOptional |
|---|---|
| Rear PTO Type | 540 |
Dimensions & Tires
| Front tread | 59.9 inches (152 cm) |
|---|---|
| Rear tread | 66 inches (167 cm) |
| Weight | 11,000 lbs (4989 kg) |
| Wheelbase | 79.875 inches (202 cm) |
| Front tire | 7.50-18 |
| Rear tire | 18-26 |
| Weight | 11,000 lbs (4989 kg) |
| Wheelbase | 79.875 inches (202 cm) |
| Ag front | 7.50-18 |
| Ag rear | 18-26 |
990 Serial Numbers
| 1958 | 67828 |
|---|---|
| 1959 | 71245 |
| 1960 | 84487 |
| 1961 | 110064 |
| Description | FAQ: How to read a serial number table. |
| Final | 115469 |
Belt Pulley
| Diameter | 12.25 inches (31 cm) |
|---|---|
| RPM | 1021 |
| Speed | 3277 ft/min (998.83 meters/min) |
| Width | 9 inches (22 cm) |
Nebraska Tractor Test 661
| Belt fuel use (max) | 6.3 gal/hour (23.8 l/hour) |
|---|---|
| Belt power (max) | 84.10 hp (62.7 kW) |
| Description | Diesel 6-speed 2WDJuly 7 - 18, 1958Link: Nebraska Tractor Test 661 file / Drawbar performance / Gear 3 used for power test. / Gear 1 used for pull test. |
| Fuel use | 5.0 gal/hour (18.9 l/hour) |
| Max power | 61.46 hp (45.8 kW) |
| Max pull | 12629 lbs (5728 kg) |
References
| Description | Industrial Wheel Tractors Sales Features published in 1959, by Oliver |
|---|
Variants
| 990 | gear drive |
|---|---|
| 995 | torque converter |