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| info | |
| 1961 - 1980, Model year 1961-19651965-19701971-1980, Utility tractor |
| Production | |
| Manufacturer: | David Brown |
| Type: | Utility tractor |
| Factory: | Meltham Mills, Huddersfield, England |
| David Brown 990 Power | |
| Engine: | 52 hp 38.8 kW |
| Drawbar (claimed): | 43 hp 32.1 kW |
| PTO (claimed): | 48 hp 35.8 kW |
| Drawbar (tested): | 43.47 hp 32.4 kW |
| PTO (tested): | 51.60 hp 38.5 kW |
| David Brown 990 Engine | |
| Fuel tank: | 13.74 gal 52.0 L |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Differential lock: | mechanical rear |
| Steering: | manual, hydrostatic power (optional) |
| Brakes: | differential mechanical expanding shoe |
| Cab: | Open operator station. |
| Transmissions: | 6-speed gear, 12-speed partially synchronized |
| Hydraulics | |
| Type: | open center |
| Pressure: | 2000 psi 137.9 bar |
| Total flow: | 7.4 gpm 28.0 lpm |
| Tractor hitch | |
| Rear Type: | II/I |
| Power Take-off (PTO) | |
| Rear PTO: | transmission, live (optional) |
| Clutch: | dry disc |
| Rear RPM: | 540/1000 (1.375) |
| Engine RPM: | 540@1800 (Low) 540@1100 (High) 1000@2000 |
| Dimensions & Tires | |
| Wheelbase: | 76.75 inches 194 cm |
| Weight: | 4272 to 4312 pounds |
| Front tire: | 6.00-16 |
| Rear tire: | 11-32 |
| 990 Serial Numbers | |
| Location: | Frame, right side |
| 1961: | 440001 |
| 1962: | 441323 |
| 1963: | 450376 |
| 1964: | 460376 |
| 1965: | 472273 |
| 1966: | 483768 |
| 1967: | 496283 |
| 1968: | 504690 |
| 1969: | 808150 |
| 1970: | 818301 |
| 1971: | 826009 |
| 1972: | 850600 |
| 1973: | 854403 |
| 1974: | 859367 |
| 1975: | 863900 |
| 1976: | 11070001 |
| 1977: | 11080236 |
| 1978: | 11089141 |
| 1979: | 11096828 |
| 1980: | 11104577 |
| Electrical | |
| Charging system: | generator |
| Batteries: | 2 |
| Battery volts: | 6 |
| info | |
| 1961 - 1980, Model year 1961-19651965-19701971-1980, Utility tractor |
| Engine Detail | |
| David Brown, diesel, 4-cylinder, liquid-cooled | |
| Displacement: | 185.8 ci 3.0 L |
| Bore/Stroke: | 3.625x4.50 inches 92 x 114 mm |
| Power: | 52 hp 38.8 kW |
| Air cleaner: | oil bath |
| Compression: | 17:1 |
| Rated RPM: | 2200 |
| Operating RPM: | 700-2200 |
| Starter volts: | 12 |
| Oil capacity: | 7.8 qts 7.4 L |
| Coolant capacity: | 14.4 qts 13.6 L |
| info | |
| 1961 - 1980, Model year 1961-19651965-19701971-1980, Utility tractor |
| Transmissions overview | |
| 6-speed gear, 12-speed partially synchronized |
| Transmission | |
| Type: | partially synchronized |
| Gears: | 12 forward and 4 reverse |
| Twelve-speed transmission introduced in 1963. | |
| info | |
| 1961 - 1980, Model year 1961-19651965-19701971-1980, Utility tractor |
| David Brown 990 Tires | |
| Standard tires (ag): | Front: 6.00-16. Rear: 11-32 |
| Dimensions | |
| Wheelbase: | 76.75 inches 194 cm |
| Length: | 118 inches 299 cm |
| Width: | 67 inches 170 cm |
| Height (hood): | 56 inches 142 cm |
| Clearance (front axle): | 20 inches 50 cm |
| Front tread: | 52/56/60/64/68/72/76 inches 132/142/152/162/172/182/193 cm |
| Rear tread: | 52/56/60/64/68/72/76 inches 132/142/152/162/172/182/193 cm |
| David Brown 990 Weight | |
| Operating: | 4272 lbs 1937 kg, 4312 lbs 1955 kg (live PTO) |
| Ballasted: | 5880 lbs 2667 kg |