10 material differences · fewer than 12
Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoSteyr 650 (a)1971–1977No measured PTO figure
Which should you choose?
We will not advise between these two machines, because the drive differs (2WD; Two-wheel or four-wheel drive); they were not built in overlapping years (1961–1965; 1971–1977). 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
10 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | 990 Implematic | 650 (a) | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 52.0 hp | 49.3 hp | +5% 990 Implematic |
| Engine declared | DAVID BROWN AD 4/47 A | Steyr WD-408.81 | differs |
| Displacement declared | 3.04 L | 2.05 L | +48% 990 Implematic |
| Maximum torque declared | 141 lb·ft · 191 N·m | 142 lb·ft · 192 N·m | — |
| Transmission | |||
| Top speed declared | 13.7 mph · 22 km/h | 18.6 mph · 30 km/h | +36% 650 (a) |
| Clutch declared | — | Pedal operated dry Fichtel & Sachs double clutch | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | 9.0 gpm · 34.0 L/min | +50% 650 (a) |
| Pressure declared | — | 2,489 psi · 172 bar | — |
| Rear PTO speeds declared | 540 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 4,771 lb · 2,164 kg | 4,806 lb · 2,180 kg | — |
| Maximum permissible mass declared | — | 8,818 lb · 4,000 kg | — |
| Wheelbase declared | 76.7–78.7 in · 1,948–1,999 mm | 83.7 in · 2,125 mm | differs |
| Length declared | 118.0–121.0 in · 2,997–3,073 mm | 138.2 in · 3,510 mm | differs |
| Width declared | 64.0 in · 1,626 mm | 66.1 in · 1,678 mm | — |
| 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 | 11.3 ft · 3.43 m | +7% 650 (a) |
| Fuel tank declared | 55.2 qt · 52.2 L | 87.7 qt · 83 L | +59% 650 (a) |
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”
Steyr 650 (a) sources
- Source: Traktorenlexikon, “Steyr 650”