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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.
David Brown 990990 ImplematicDavid Brown tractorsutility tractor3.0L diesel engine52 hp tractortractor specifications
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)