Wikitractor

David Brown 990

Production ended · 2WD

PTO power · claimed

48 hp

Weight
4,272 lb
Engines
1 Diesel
Built
no record
Price new
no record

Power

Engine52 hp unspecified
PTO48 hp claimed
PTO, tested51.6 hp
Drawbar43 hp claimed
Drawbar, tested43.5 hp
Listed power52 hp engine basis

Engines

David Brown 3.0L 4-cyl dieselDiesel · 4 cyl186 ci
Engine details
David Brown 3.0L 4-cyl diesel
Bore × stroke
3.63 in × 4.5 in
Rated speed
2,200 rpm
Rated power
52 hp
Compression
17:1
Cooling
liquid-cooled

Transmissions

6-speed geargear6F / 2R
12-speed partially synchronizedpartially synchronized12F / 4R
Transmission notes

6-speed gear: Three gears (1-3) plus reverse (R) in low and high ranges.

12-speed partially synchronized: Twelve-speed transmission introduced in 1963.

Weight

Weight4,272 lb operating
Ballasted5,880 lb

Dimensions

Wheelbase76.8 in
Length118 in
Width67 in
Front axle clearance20 in

Capacities

Fuel tank13.7 gal

Hydraulics

Systemopen center
Pump flowno record
Total flow7.4 gpm
Pressure2,000 psi

Hitch

Rear hitch categoryII/I
Rear lift capacityno record

PTO

Rear PTOtransmission
Rear PTO speeds540/1000 (1.375)
Clutchdry disc
Engine rpm at PTO speed540@1800 (Low)

Chassis

Drive2WD
Steeringmanual
BrakesDifferential mechanical expanding shoe brakes
Differential lockmechanical rear
CabOpen operator station

Tires

Front6.00-16
Rear11-32

Electrical

System voltage6 V
Batteries2
Charginggenerator

Production

FactoriesMeltham Mills, Huddersfield, England
Built byDavid Brown

Serial numbers

Frame, right side

YearFirst serial
1961440001
1962441323
1963450376
1964460376
1965472273
1966483768
1967496283
1968504690
1969808150
1970818301
1971826009
1972850600
1973854403
1974859367
1975863900
197611070001
197711080236
197811089141
197911096828
198011104577