The David Brown 990 Implematic is a 2WD utility tractor manufactured by David Brown in Meltham Mills, Huddersfield, England from 1961 to 1965. The David Brown 990 Implematic is equipped with a 3.0 L (185.8 cu·in) four-cylinder diesel engine and one of two transmissions: a gear type transmission with 6 forward and 2 reverse gears and dry disc clutch or a partially synchronized transmission with 12 forward and 4 reverse gears.
The DB 990 Implematic utility tractor used the David Brown engine. It is a 3.0 L, 3,044 cm2, (185.8 cu·in) four-cylinder natural aspirated diesel engine with 92.0 mm (3.62 in) of the cylinder bore and 114.0 mm (4.49 in) of the piston stroke. The compression ratio rating is 17.0:1. This engine produced 52.8 PS (38.8 kW; 52.0 HP) at 2,200 rpm of output power.
The David Brown 990 Implematic is equipped with manual or hydrostatic power (optional) steering, differential mechanical expanding shoe brakes, open operator station, and 52.0 liters (13.7 US gal.; 11.4 Imp. gal) fuel tank.
David Brown 990 Implematic Specifications
| General Specifications | |
| Model | David Brown 990 Implematic |
| Length | 2,990 mm (117.7 in) |
| Width | 1,700 mm (66.9 in) |
| Height (hood) | 1,420 mm (55.9 in) |
| Wheel base | 1,940 mm (76.4 in) |
| Ground clearance (front axle) | 500 mm (19.7 in) |
| Weight (operating) | 1,940 kg (4,277 lbs) |
| Fuel tank capacity | 52.0 liters (13.7 US gal.; 11.4 Imp. gal) |
| Battery | Two 6V |
| Cabin type | Open operator station |
| Engine | |
| Engine model | David Brown |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 4 |
| Fuel type | Diesel |
| Displacement | 3.0 L, 3,044 cm2, (185.8 cu·in) |
| Bore and stroke | 92.0 mm X 114.0 mm (3.62 in X 4.49 in) |
| Compression ratio | 17.0:1 |
| Horsepower | 52.8 PS (38.8 kW; 52.0 HP) at 2,200 rpm |
| Starter | Electric |
| Oil capacity: | 7.4 L (7.8 US. qt, 6.5 Imp. qt.) |
| Coolant capacity: | 13.6 L (14.4 US. qt, 12 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| 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: 19.1 kmh (11.9 mph) Reverse: 10.4 kmh (6.5 mph) |
| Transmission model | – |
| Transmission type | Partially synchronized |
| Gears | 12 forward and 4 reverse |
| Tires | |
| Front tires | Ag: 6.00-16 |
| Rear tires | Ag: 11-32 |
| Three-Point Hitch | |
| Category | II/I |
| Control type | – |
| Lift capacity (at ends) | – |
| PTO (Power take-off shaft) | |
| Rear PTO type | Transmission or live (optional) |
| Rear PTO speed | 540/1000 rpm |
| Hydraulic system | |
| Hydraulic type | Open center |
| Pressure | 2000 psi (137.9 bar) |
| Total flow | 7.4 gpm (28 lpm) |
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