David Brown 990 IMPLEMATIC
Built: 09/1961–10/1965 · Series: IMPLEMATIC-Baureihe
More machines from model year 1961
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David Brown 990 Implematic (1961-1965) from Meltham, Yorkshire: water-cooled four-cylinder diesel of 3,044 cc, 52.7 hp/38.8 kW at 2,200 rpm, Implematic hydraulic implement control, 2,164 kg
David Brown was a British tractor manufacturer based in Meltham, near Huddersfield in Yorkshire. The 990 Implematic series was built from September 1961 to October 1965. The Implematic name refers to the maker's hydraulic implement control system, which used the three-point linkage to regulate the depth and draft of mounted implements such as a plough or cultivator.
Read on 3 more paragraphs
The water-cooled four-cylinder diesel engine has a displacement of 3,044 cc and produces 52.7 hp (38.8 kW) at 2,200 rpm, with 191 Nm of torque. The 990 Implematic is 2,997 mm long, 1,626 mm wide and 1,422 mm high, with a wheelbase of 1,948 mm and a weight of 2,164 kg. Its top speed is 22 km/h.
A hydraulic implement control system such as Implematic allowed the working depth of a mounted implement to be adjusted continuously according to soil resistance, rather than relying solely on a fixed setting of the three-point hydraulics. At almost 39 kW and three litres of displacement, the 990 sat in the mid-size class of tractors typical of the early 1960s, built for ploughing, cultivating and PTO work on medium-sized farms.
When buying a used example, check the hydraulic system particularly carefully, including the pump, valve block and seals of the Implematic control, since wear here leads to imprecise depth regulation. Beyond that, check the radiator and water pump, clutch and gearbox synchromesh, PTO clutch, and rust on wings and floor panels. Spare parts are supplied by specialist dealers in classic David Brown tractors.
Sources: SpecCodex-Register: Kennwerte des Modells David Brown 990 Implematic
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 52.7 hp (38.8 kW)correct |
| Rated speed | 2,200 rpmcorrect |
| Torque | 191 Nmcorrect |
| Speed at max. torque | 1,300 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 3,044 cm³correct |
| Bore | 92.1 mmcorrect |
| Stroke | 114.3 mmcorrect |
| Compression ratio | 17correct |
| Injection pressure | 172 barcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 2,997 mmcorrect |
|---|---|
| Width | 1,626 mmcorrect |
| Height | 1,422 mmcorrect |
| Wheelbase | 1,948 mmcorrect |
| Ground clearance | 508 mmcorrect |
| Unladen weight | 2,164 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6 V/2 R and 12 V/4 Rcorrect |
| Gears | 6correct |
| Front tyres | 6.00-16 ASFcorrect |
| Rear tyres | 11-32 AScorrect |
| Top speed | 22 km/hcorrect |
Working data
| Fuel tank capacity | 52.2 lcorrect |
|---|
Origin and approval
| Units built | 40,599correct |
|---|
Other data
| Linkage category | Cat I/IIcorrect |
|---|---|
| PTO speed | 540/1000 rpmcorrect |
Where this model stands
Power-to-weight ratio: 17.9 kW/t (39 kW / 2.2 t)
Power class: Universal (40–100 hp)
Stronger than 36% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the David Brown 990 IMPLEMATIC have?
The David Brown 990 IMPLEMATIC delivers 52.7 hp.
How much does the David Brown 990 IMPLEMATIC weigh?
The unladen weight is 2,164 kg.
What engine does the David Brown 990 IMPLEMATIC have?
4 cylinders, 3,044 cm³ displacement, Diesel.
How fast does the David Brown 990 IMPLEMATIC go?
Top speed is 22 km/h.
What are the dimensions of the David Brown 990 IMPLEMATIC?
2,997 mm × 1,626 mm × 1,422 mm.
When was the David Brown 990 IMPLEMATIC built?
Production years: 09/1961–10/1965.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 31 individual figures for this model. They come from 3 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · Traficom — Finnish vehicle register (retrieved August 2026) · Wikipedia (retrieved August 2026) · How we check the data
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