David Brown 990 Implematic
The David Brown 990 Implematic is a tractor produced by David Brown. It is equipped with a 185.8 ci 3.0 L engine. The listed engine power is Diesel (listed): 52 hp / 38.8 kW. Transmission: 12 forward and 4 reverse. Operating weight: 4272 to 4312 pounds.
Engine Power
Diesel (listed): 52 hp / 38.8 kW
Fuel & Capacities
13.74 gal
52.0 L
Transmission
12 forward and 4 reverse
Operating Weight
4272 to 4312 pounds
Overview
 | 1961 - 1980
Model year 1961-19651965-19701971-1980
Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | David Brown |
Utility tractor | |
Built in Meltham Mills, Huddersfield, England | |
David Brown 990 Engine | |
|---|---|
David Brown 3.0L 4-cyl diesel | |
Fuel tank | 13.74 gal
52.0 L |
Engine details ...  | |
David Brown 990 Power | |
|---|---|
Engine | 52 hp
38.8 kW |
Drawbar (claimed) | 43 hp
32.1 kW |
PTO (claimed) | 48 hp
35.8 kW |
Drawbar (tested) | 43.47 hp
32.4 kW |
PTO (tested) | 51.60 hp
38.5 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two-wheel drive | |
Differential lock | mechanical rear |
Steering | manual |
hydrostatic power (optional) | |
Differential mechanical expanding shoe brakes | |
Open operator station. | |
Hydraulics | |
|---|---|
Type | open center |
Pressure | 2000 psi
137.9 bar |
Total flow | 7.4 gpm
28.0 lpm |
Tractor hitch | |
|---|---|
Rear Type | II/I |
Power Take-off (PTO) | |
|---|---|
Rear PTO | transmission |
live (optional) | |
Clutch | dry disc |
Rear PTO Type | 540/1000 (1.375) |
Engine RPM | 540@1800 (Low) |
540@1100 (High) | |
1000@2000 | |
Dimensions & Tires | |
|---|---|
Wheelbase | 76.75 inches
194 cm |
Weight | 4272 to 4312 pounds |
Front tire | 6.00-16 |
Rear tire | 11-32 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | generator |
Batteries | 2 |
Battery volts | 6 |
Engine
Engine Detail — 185.8 ci / 3.0 L Diesel
Manufacturer | David Brown |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 185.8 ci
3.0 L |
Bore/Stroke | 3.625x4.50 inches
92 x 114 mm |
Power | 52 hp
38.8 kW |
Air cleaner | oil bath |
Compression | 17:1 |
Rated RPM | 2200 |
Operating RPM | 700-2200 |
Starter volts | 12 |
Oil capacity | 7.8 qts
7.4 L |
Coolant capacity | 14.4 qts
13.6 L |
Transmission
Transmission options | |
|---|---|
6-speed gear | |
12-speed partially synchronized |
Transmission — 6 forward and 2 reverse gear
Type | gear |
Gears | 6 forward and 2 reverse |
Clutch | 279mm dry disc |
Three gears (1-3) plus reverse (R) in low and high ranges. | |
 | |
Transmission — 12 forward and 4 reverse partially synchronized
Type | partially synchronized |
Gears | 12 forward and 4 reverse |
Twelve-speed transmission introduced in 1963. | |
Dimensions
David Brown 990 Tires | |
|---|---|
Standard tires (ag) | Front: 6.00-16. Rear: 11-32 |
Dimensions | |
|---|---|
Wheelbase | 76.75 inches
194 cm |
Length | 118 inches
299 cm |
Width | 67 inches
170 cm |
Height (hood) | 56 inches
142 cm |
Clearance (front axle) | 20 inches
50 cm |
Front tread | 52/56/60/64/68/72/76 inches
132/142/152/162/172/182/193 cm |
Rear tread | 52/56/60/64/68/72/76 inches
132/142/152/162/172/182/193 cm |
David Brown 990 Weight | |
|---|---|
Operating | 4272 lbs
1937 kg |
4312 lbs (live PTO)
1955 kg | |
Ballasted | 5880 lbs
2667 kg |
Tests
Nebraska Tractor Test 903 | |
|---|---|
3L diesel 6-speed 2WD
June 11 - 19, 1965
Link: Nebraska Tractor Test 903 file | |
PTO performance | |
Power at rated engine speed | 51.60 hp
38.5 kW |
Fuel use | 3.4 gal/hour
12.9 l/hour |
Power at rated PTO speed | 48.49 hp
36.2 kW |
Fuel use | 3.0 gal/hour
11.4 l/hour |
Drawbar performance | |
Max power | 43.47 hp
32.4 kW |
Fuel use | 3.4 gal/hour
12.9 l/hour |
Gear 3 used for power test. | |
Max pull | 6,039 lbs
2739 kg |
Gear 1 used for pull test. | |
Photos
1965 David Brown 990 Implematic, right side.
Recommended Implements & Sizing Guide
Engineering recommendations for David Brown 990 Implematic based on its 52 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm) | Medium Duty | Standard utility farm tillage. |
Rotary Cutter / MowerMowing & Clearing | 6 ft (72 in)1.8 m | Medium Duty | Medium pasture clearing; rear slip-clutch recommended. |
Rotary TillerSeedbed Prep | 66 to 72 in165 - 180 cm | Medium Duty | Standard utility tiller; slip clutch protection required. |
Disc HarrowSecondary Tillage | 7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙 | Medium Duty | Field leveling and clod breaking behind plows. |
Hay BalerHay & Forage | Small Square Baler (14x18")小方捆打捆机 (36x46 cm) | Medium Duty | Classic 2-string baler for horse and small livestock hay. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for David Brown 990 Implematic.
Estimated Continuous Field Runtime: 5.1 hrs
Approximately 5.1 hours of continuous field operation at ~75% rated power on a full tank (13.7 gal / 52 L).
Estimated 75% Load Fuel Burn~2.7 gal/hr (10.2 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
David Brown 990 Implematic Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for David Brown 990 Implematic.
Converted Equivalents:
Horsepower (HP)52 hp
Kilowatts (kW)38.8 kW
Metric Horsepower (PS / CV)52.7 PS
Direct Competitor Comparison
Compare David Brown 990 Implematic against same-era industry alternatives in the same horsepower class.
Current Model
David Brown
David Brown 990 Implematic
Engine Power:Diesel (listed): 52 hp / 38.8 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 340
Engine Power:47
Production Years:1958 - 1963
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