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| info | |
| The Oliver 990 was also sold as the Massey Ferguson 98 (with different sheet metal, paint, and seat). |
| Production | |
| Manufacturer: | Oliver |
| Factory: | Charles City, Iowa, USA |
| Original price (USD), $8,200 (1961 ), | |
| Power Take-off (PTO) | |
| Rear PTO: | independent*Optional |
| Rear RPM: | 540 |
| Dimensions & Tires | |
| Wheelbase: | 79.875 inches [202 cm] |
| Weight: | 11,000 lbs [4989 kg] |
| Front tire: | 7.50-18 |
| Rear tire: | 18-26 |
| Oliver 990 Power | |
| Drawbar (claimed): | 61.4 hp [45.8 kW] |
| PTO (claimed): | 84.1 hp [62.7 kW] |
| Plows: | 6 |
| Drawbar (tested): | 61.46 hp [45.8 kW] |
| Belt (tested): | 84.10 hp [62.7 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Steering: | power |
| Brakes: | disc |
| Cab: | Open operator station. |
| Belt Pulley | |
| Diameter: | 12.25 inches [31 cm] |
| Width: | 9 inches [22 cm] |
| RPM: | 1021 |
| Speed: | 3277 ft/min [998.83 meters/min] |
| Battery | |
| Number: | 2 |
| Volts: | 6 |
| info | |
| Bore/Stroke: | 4.25x5.00 inches [108 x 127 mm] |
| Compression: | 17:1 |
| Rated RPM: | 1800 |
| Starter volts: | 12 |
| Engine Detail | |
| two-cycle engine with mechanical blower, General Motors 3-71, blower diesel, 3-cylinder, liquid-cooled, 213 ci [3.5 L] |
| info | |
| Series next: | Oliver 995 |
| Series back: | Oliver 950 |
| Transmission | |
| Type: | gear |
| Gears: | 6 forward and 2 reverse |
| Clutch: | dry disc |
| info | |
| Series next: | Oliver 995 |
| Series back: | Oliver 950 |
| Dimensions | |
| Weight: | 11,000 lbs [4989 kg] |
| Wheelbase: | 79.875 inches [202 cm] |
| Front tread: | 59.9 inches [152 cm] |
| Rear tread: | 66 inches [167 cm] |
| Oliver 990 Tires | |
| Ag front: | 7.50-18 |
| Ag rear: | 18-26, 14-34, 15-34 |