The David Brown 990 Selectamatic is a 2WD or 4WD utility tractor from the Selectamatic series. The first generation was manufactured by David Brown in Meltham Mills, Huddersfield, England from 1965 to 1970. The David Brown 990 Selectamatic is equipped with a 3.2 L (195.0 cu·in) four-cylinder diesel engine and one of two transmissions: a gear type transmission with 6 forward and 2 reverse gears and with dry disc clutch or a partially synchronized with dry disc clutch transmission with 12 forward and 4 reverse gears.
The David Brown 990 Selectamatic utility tractor used the David Brown engine. It is a 3.2 L, 3,195 cm2, (195.0 cu·in) four-cylinder natural aspirated diesel engine with 100.0 mm (3.94 in) of the cylinder bore and 102.0 mm (4.02 in) of the piston stroke. The compression ratio rating is 17.0:1. This engine produced 55.8 PS (41.0 kW; 55.0 HP) at 2,200 rpm of output power and 189.8 N·m (19.4 kg·m, 139.9 ft·lb) at 1,400 rpm of torque.
The David Brown 990 Selectamatic is equipped with manual or hydrostatic power (optional) steering, differential mechanical expanding shoe brakes, open operator station, and 60.9 liters (16.1 US gal.; 13.4 Imp. gal) fuel tank.
David Brown 990 Selectamatic Specifications
| General Specifications | |
| Model | David Brown 990 Selectamatic |
| Length | 2WD: 3,200 mm (126 in) 4WD: 3,220 mm (126.8 in) |
| Width | 1,620 mm (63.8 in) |
| Height | – |
| Wheel base | 2WD: 2,000 mm (78.7 in) 4WD: 1,950 mm (76.8 in) |
| Ground clearance (front axle) | 2WD: 540 mm (21.3 in) 4WD: 330 mm (13 in) |
| Weight | 2WD: 2,315 kg (5,104 lbs) 4WD: 2,630 kg (5,798 lbs) |
| Fuel tank capacity | 60.9 liters (16.1 US gal.; 13.4 Imp. gal) |
| Battery | 12V, 96Ah |
| Cabin type | Open operator station |
| Engine | |
| Engine model | David Brown |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 4 |
| Fuel type | Diesel |
| Displacement | 3.2 L, 3,195 cm2, (195.0 cu·in) |
| Bore and stroke | 100.0 mm X 102.0 mm (3.94 in X 4.02 in) |
| Compression ratio | 17.0:1 |
| Horsepower | 55.8 PS (41.0 kW; 55.0 HP) at 2,200 rpm |
| Torque | 189.8 N·m (19.4 kg·m, 139.9 ft·lb) at 1,400 rpm |
| Starter | Electric |
| Oil capacity: | 7.5 L (7.9 US. qt, 6.6 Imp. qt.) |
| Coolant capacity: | 14.0 L (14.8 US. qt, 12.3 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD or 4×4 MFWD 4WD |
| Steering type | Manual or hydrostatic power (optional) |
| Brakes | Differential mechanical expanding shoe |
| Differential lock | Mechanical rear |
| Transmission model | – |
| Transmission type | Gear type with dry disc clutch |
| Gears | 6 forward and 2 reverse |
| Speed | Forward: 22.7 kmh (14.1 mph) Reverse: 12.3 kmh (7.6 mph) |
| Transmission model | – |
| Transmission type | Partially synchronized with dry disc clutch |
| Gears | 12 forward and 4 reverse |
| Transmission oil capacity | 23.0 L (6.1 US. gal, 5.1 Imp. gal.) |
| Tires | |
| Front tires | Ag: 6.00-19 (2WD), 9.5-24 (4WD) |
| Rear tires | Ag: 12.4-36 |
| Three-Point Hitch | |
| Category | II/I |
| Control type | Position control |
| Lift capacity (at ends) | 907 kg (2,000 lbs) |
| PTO (Power take-off shaft) | |
| Rear PTO type | Transmission or live (option) |
| Rear PTO speed | 540/1000 rpm |
| Hydraulic system | |
| Hydraulic type | Open center |
| Pressure | 2000 psi (137.9 bar) |
| Pump flow | 7.2 gpm (27.3 lpm) |
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