David Brown

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
Engine52 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
Typediesel
ModelDavid Brown 3.0L 4-cyl diesel
Power52 hp (38.8 kW)
Coolingliquid-cooled
Cylinders4-cylinder
Fuel tank13.74 gal (52.0 L)
Rated RPM2200
Air cleaneroil bath
Bore/Stroke3.625x4.50 inches (92 x 114 mm)
Compression17:1
Displacement185.8 ci (3.0 L)
Oil capacity7.8 qts (7.4 L)
Operating RPM700-2200
Starter volts12
Coolant capacity14.4 qts (13.6 L)
Weight
Ballasted5880 lbs (2667 kg)
Operating4272 lbs (1937 kg)
Operating (live PTO)4312 lbs (1955 kg)
Dimensions
Width67 inches (170 cm)
Length118 inches (299 cm)
Wheelbase76.75 inches (194 cm)
Rear tread52/56/60/64/68/72/76 inches (132/142/152/162/172/182/193 cm)
Front tread52/56/60/64/68/72/76 inches (132/142/152/162/172/182/193 cm)
Height (hood)56 inches (142 cm)
Clearance (front axle)20 inches (50 cm)
Electrical
Batteries2
Battery volts6
Charging systemgenerator
Hydraulics
Typeopen center
Pressure2000 psi (137.9 bar)
Total flow7.4 gpm (28.0 lpm)
Mechanical
DriveTwo-wheel drive
BrakesDifferential mechanical expanding shoe brakes
Steeringmanual, hydrostatic power (optional)
Operator stationOpen operator station
Differential lockmechanical rear
Production
TypeUtility tractor
Built inMeltham Mills, Huddersfield, England
Years made1961 - 1980
ManufacturerDavid Brown
Transmission
Options6-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 TypeII/I
Serial Numbers
1961440001
1962441323
1963450376
1964460376
1965472273
1966483768
1967496283
1968504690
1969808150
1970818301
1971826009
1972850600
1973854403
1974859367
1975863900
197611070001
197711080236
197811089141
197911096828
198011104577
LocationFrame, right side
Power Take-off (PTO)
Clutchdry disc
Live PTOoptional
Rear PTOtransmission
Engine RPM540@1800 (Low), 540@1100 (High), 1000@2000
Rear PTO Type540/1000 (1.375)