2 material differences · fewer than 12
Tractor oneDavid Brown 850 Implematic1960–1965No measured PTO figureTractor twoOLIVER 5001961–1963No measured PTO figure
Which should you choose?
We will not advise between these two machines, because their power is identical, with the same weight or the same engine, which usually means one machine sold under two names; any difference below comes from how each source describes it. 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
2 material differences · 14 fields identical or within 5%, which is not counted as material
| Field | 850 Implematic | 500 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 35.0 hp | 34.5 hp | — |
| Engine declared | DAVID BROWN AD 4/36 A-106 | DAVID BROWN AD 4/36 A-106 | — |
| Displacement declared | 2.52 L | 2.52 L | — |
| Maximum torque declared | 110 lb·ft · 149 N·m | 110 lb·ft · 149 N·m | — |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 15.5 mph · 25 km/h | — |
| Clutch declared | Pedal-operated dry BORG & BECK single-plate clutch type 10 inch | Pedal-operated dry single-plate clutch | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | 6.0 gpm · 22.7 L/min | — |
| Rear PTO speeds declared | 540 rpm | 540 rpm / 1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 3,704 lb · 1,680 kg | 3,704 lb · 1,680 kg | — |
| Wheelbase declared | 75.2 in · 1,911 mm | 75.2 in · 1,911 mm | — |
| Length declared | 114.0 in · 2,896 mm | 113.6 in · 2,885 mm | — |
| Width declared | 62.8 in · 1,594 mm | 62.8 in · 1,594 mm | — |
| Height, over the bonnet declared | 51.5 in · 1,308 mm | 51.7 in · 1,314 mm | — |
| Ground clearance declared | 15.5 in · 394 mm | 15.4 in · 390 mm | — |
| Turning radius, braked declared | 7.9 ft · 2.41 m | 7.9 ft · 2.41 m | — |
| Fuel tank declared | 42.1 qt · 39.8 L | 42.1 qt · 39.8 L | — |
David Brown 850 Implematic sources
Source
- Source: Traktorenlexikon, “David Brown 850”
OLIVER 500 sources
Source
- Source: Traktorenlexikon, “Oliver 500”
- Source: Traktorenlexikon, “David Brown 850”