David Brown 990 Implematic: all source data
All 70 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production| Manufacturer | David Brown |
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| (no label) | Utility tractor |
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| (no label) | Built in Meltham Mills, Huddersfield, England |
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Engine| (no label) | David Brown 3.0L 4-cyl diesel |
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| Fuel tank | 13.74 gal | 52.0 L |
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Transmission| (no label) | 6-speed gear |
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| (no label) | 12-speed partially synchronized |
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Power| Engine | 52 hp | 38.8 kW |
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| Drawbar (claimed) | 43 hp | 32.1 kW |
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| PTO (claimed) | 48 hp | 35.8 kW |
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| Drawbar (tested) | 43.47 hp | 32.4 kW |
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| PTO (tested) | 51.60 hp | 38.5 kW |
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Mechanical| (no label) | Two-wheel drive |
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| Differential lock | mechanical rear |
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| Steering | manual |
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| Steering | hydrostatic power (optional) |
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| (no label) | Differential mechanical expanding shoe brakes |
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| (no label) | Open operator station. |
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Hydraulics| Type | open center |
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| Pressure | 2000 psi | 137.9 bar |
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| Total flow | 7.4 gpm | 28.0 lpm |
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Pto| Rear PTO | transmission |
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| Rear PTO | live (optional) |
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| Clutch | dry disc |
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| Rear PTO Type | 540/1000 (1.375) |
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| Engine RPM | 540@1800 (Low) |
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| Engine RPM | 540@1100 (High) |
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| Engine RPM | 1000@2000 |
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Dimensions| Wheelbase | 76.75 inches | 194 cm |
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| Weight | 4272 to 4312 pounds |
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| Front tire | 6.00-16 |
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| Rear tire | 11-32 |
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Electrical| Charging system | generator |
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| Batteries | 2 |
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| Battery volts | 6 |
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Engine
Engine detail| (no label) | David Brown |
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| (no label) | diesel |
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| (no label) | 4-cylinder |
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| (no label) | liquid-cooled |
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| Displacement | 185.8 ci | 3.0 L |
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| Bore/Stroke | 3.625x4.50 inches | 92 x 114 mm |
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| Power | 52 hp | 38.8 kW |
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| Air cleaner | oil bath |
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| Compression | 17:1 |
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| Rated RPM | 2200 |
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| Operating RPM | 700-2200 |
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| Starter volts | 12 |
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| Oil capacity | 7.8 qts | 7.4 L |
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| Coolant capacity (Coolant) | 14.4 qts | 13.6 L |
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Transmission
Transmission options| (no label) | 6-speed gear |
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| (no label) | 12-speed partially synchronized |
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Transmission| Type | gear |
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| Gears | 6 forward and 2 reverse |
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| Clutch | 279mm dry disc |
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| (no label) | Three gears (1-3) plus reverse (R) in low and high ranges. |
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| Type | partially synchronized |
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| Gears | 12 forward and 4 reverse |
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| (no label) | Twelve-speed transmission introduced in 1963. |
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Dimensions
Tires| Standard tires (ag) | Front: 6.00-16. Rear: 11-32 |
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Dimensions| Wheelbase | 76.75 inches | 194 cm |
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| Length | 118 inches | 299 cm |
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| Width | 67 inches | 170 cm |
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| Height (hood) | 56 inches | 142 cm |
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| Clearance (front axle) | 20 inches | 50 cm |
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| Front tread | 52/56/60/64/68/72/76 inches | 132/142/152/162/172/182/193 cm |
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| Rear tread | 52/56/60/64/68/72/76 inches | 132/142/152/162/172/182/193 cm |
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Weight| Operating | 4272 lbs | 1937 kg |
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| Operating | 4312 lbs (live PTO) | 1955 kg |
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| Ballasted | 5880 lbs | 2667 kg |
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