11 material differences · fewer than 12
Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoMAN 4R31961–1962No measured PTO figure
Which should you choose?
We will not advise between these two machines, because the drive differs (2WD; 4WD). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.
Field by field
11 material differences · 0 fields identical or within 5%, which is not counted as material
| Field | 990 Implematic | 4R3 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 52.0 hp | 44.1 hp | +18% 990 Implematic |
| Engine declared | DAVID BROWN AD 4/47 A | MAN D 8614 M 1/2/3 | differs |
| Displacement declared | 3.04 L | 2.56 L | +19% 990 Implematic |
| Maximum torque declared | 141 lb·ft · 191 N·m | — | — |
| Transmission | |||
| Top speed declared | 13.7 mph · 22 km/h | 11.9–16.8 mph · 19.1–27.0 km/h | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | — | — |
| Rear PTO speeds declared | 540 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 4,771 lb · 2,164 kg | 5,512 lb · 2,500 kg | +16% 4R3 |
| Maximum permissible mass declared | — | 7,716 lb · 3,500 kg | — |
| Wheelbase declared | 76.7–78.7 in · 1,948–1,999 mm | 81.5 in · 2,070 mm | differs |
| Length declared | 118.0–121.0 in · 2,997–3,073 mm | 129.9 in · 3,300 mm | differs |
| Width declared | 64.0 in · 1,626 mm | 73.4 in · 1,865 mm | +15% 4R3 |
| Ground clearance declared | 20.0 in · 508 mm | 15.7 in · 400 mm | +27% 990 Implematic |
| Turning radius, braked declared | 10.5 ft · 3.20 m | 11.5 ft · 3.50 m | +9% 4R3 |
| Fuel tank declared | 55.2 qt · 52.2 L | 71.9 qt · 68 L | +30% 4R3 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
David Brown 990 Implematic sources
- Source: Traktorenlexikon, “David Brown 990 Implematic”
MAN 4R3 sources
- Source: Traktorenlexikon, “MAN 4R3”