David Brown 990 Implematic
The David Brown 990 Implematic is a utility tractor produced from 1961 to 1980 by David Brown in Meltham Mills, Huddersfield, England. It features a 3.0L 4-cylinder liquid-cooled diesel engine producing 52 hp, with transmission options including a 6-speed gear and a 12-speed partially synchronized gearbox. The tractor has two-wheel drive with mechanical rear differential lock and optional hydrostatic power steering. It includes an open operator station, open center hydraulics with 2000 psi pressure, and a rear PTO with multiple speed options. The tractor weighs between 4272 and 4312 lbs operating, with ballasted weight up to 5880 lbs. Standard tires are 6.00-16 front and 11-32 rear.
Power-
Founded-
Model990 Implematic
Technical Specifications
Detailed specifications and technical data for David Brown 990 Implematic
Power
| Engine | 52 hp (38.8 kW) |
|---|---|
| PTO (tested) | 51.60 hp (38.5 kW) |
| PTO (claimed) | 48 hp (35.8 kW) |
| Drawbar (tested) | 43.47 hp (32.4 kW) |
| Drawbar (claimed) | 43 hp (32.1 kW) |
Tires
| Standard tires (ag) | Front: 6.00-16. Rear: 11-32 |
|---|
Engine
| Type | diesel |
|---|---|
| Model | David Brown 3.0L 4-cyl diesel |
| Power | 52 hp (38.8 kW) |
| Cooling | liquid-cooled |
| Cylinders | 4-cylinder |
| Fuel tank | 13.74 gal (52.0 L) |
| Rated RPM | 2200 |
| Air cleaner | oil bath |
| Bore/Stroke | 3.625x4.50 inches (92 x 114 mm) |
| Compression | 17:1 |
| Displacement | 185.8 ci (3.0 L) |
| Oil capacity | 7.8 qts (7.4 L) |
| Operating RPM | 700-2200 |
| Starter volts | 12 |
| Coolant capacity | 14.4 qts (13.6 L) |
Weight
| Ballasted | 5880 lbs (2667 kg) |
|---|---|
| Operating | 4272 lbs (1937 kg) |
| Operating (live PTO) | 4312 lbs (1955 kg) |
Dimensions
| Width | 67 inches (170 cm) |
|---|---|
| Length | 118 inches (299 cm) |
| Wheelbase | 76.75 inches (194 cm) |
| Rear tread | 52/56/60/64/68/72/76 inches (132/142/152/162/172/182/193 cm) |
| Front tread | 52/56/60/64/68/72/76 inches (132/142/152/162/172/182/193 cm) |
| Height (hood) | 56 inches (142 cm) |
| Clearance (front axle) | 20 inches (50 cm) |
Electrical
| Batteries | 2 |
|---|---|
| Battery volts | 6 |
| Charging system | generator |
Hydraulics
| Type | open center |
|---|---|
| Pressure | 2000 psi (137.9 bar) |
| Total flow | 7.4 gpm (28.0 lpm) |
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Brakes | Differential mechanical expanding shoe brakes |
| Steering | manual, hydrostatic power (optional) |
| Operator station | Open operator station |
| Differential lock | mechanical rear |
Production
| Type | Utility tractor |
|---|---|
| Built in | Meltham Mills, Huddersfield, England |
| Years made | 1961 - 1980 |
| Manufacturer | David Brown |
Transmission
| Options | 6-speed gear, 12-speed partially synchronized |
|---|---|
| Type (6-speed) | gear |
| Gears (6-speed) | 6 forward and 2 reverse |
| Notes (6-speed) | Three gears (1-3) plus reverse (R) in low and high ranges. |
| Type (12-speed) | partially synchronized |
| Clutch (6-speed) | 279mm dry disc |
| Gears (12-speed) | 12 forward and 4 reverse |
| Notes (12-speed) | Twelve-speed transmission introduced in 1963. |
Tractor hitch
| Rear Type | II/I |
|---|
Serial Numbers
| 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 |
| Location | Frame, right side |
Power Take-off (PTO)
| Clutch | dry disc |
|---|---|
| Live PTO | optional |
| Rear PTO | transmission |
| Engine RPM | 540@1800 (Low), 540@1100 (High), 1000@2000 |
| Rear PTO Type | 540/1000 (1.375) |
More David Brown models
View all David Brown modelsDavid Brown 1200 SelectamaticModel1200 Selectamatic
David Brown 1210Model1210
David Brown 1212Model1212
David Brown 1290Model1290
David Brown 1390Model1390
David Brown 1410Model1410
David Brown 1412Model1412
David Brown 1490Model1490
David Brown 1690Model1690
David Brown 25Model25
David Brown 2DModel2D
David Brown 30Model30
