9 material differences · fewer than 12
Tractor oneBührer RP-21 Super (A)1969–1975No measured PTO figureTractor twoJ.I. Case 8311960–1969No measured PTO figure
Which should you choose?
Read our verdict on the RP-21 Super (A) and the 831 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
9 material differences · 0 fields identical or within 5%, which is not counted as material
| Field | RP-21 Super (A) | 831 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 71 hp | 66.0 hp | +8% RP-21 Super (A) |
| Engine declared | Perkins A 4.248 | — | — |
| Displacement declared | 4.07 L | — | — |
| Maximum torque declared | 212 lb·ft · 287 N·m | — | — |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 18.6 mph · 30 km/h | +20% 831 |
| Hydraulics & hitch | |||
| Pump flow declared | 5.2 gpm · 19.5 L/min | 15.5 gpm · 58.7 L/min | +201% 831 |
| Pressure declared | 2,845 psi · 196 bar | — | — |
| Rear PTO speeds declared | 540 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 5,807 lb · 2,634 kg | 7,145 lb · 3,241 kg | +23% 831 |
| Wheelbase declared | 84.5 in · 2,147 mm | 101.7 in · 2,584 mm | +20% 831 |
| Length declared | 132.3 in · 3,360 mm | 143.4 in · 3,642 mm | +8% 831 |
| Width declared | 72.8 in · 1,850 mm | 85.2 in · 2,165 mm | +17% 831 |
| Ground clearance declared | 16.1 in · 410 mm | 20.0 in · 508 mm | +24% 831 |
| Turning radius, braked declared | 10.6 ft · 3.23 m | 11.9 ft · 3.63 m | +12% 831 |
| Fuel tank declared | — | 69.2 qt · 65.5 L | — |
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.
Bührer RP-21 Super (A) sources
- Source: Traktorenlexikon, “Bührer RP 21 Super (A)”
- Source: Traktorenlexikon, “Massey Ferguson MF 178”
J.I. Case 831 sources
- Source: Traktorenlexikon, “Case 831”