Bührer RP-21 Super (A) or J.I. Case 831?
Which should you choose?
On performance, every comparable figure that differs favours the J.I. Case 831: hydraulic flow. It is also ahead on top speed and PTO speeds. On features, the Bührer RP-21 Super (A) is ahead on forward gears and drive.
- The J.I. Case 831 suits PTO-driven implements (mowers, balers, pumps) better on this data: offers 1000 rpm.
- The J.I. Case 831 suits loader and hydraulic implement work better on this data: 201% (39.2 L/min / 10.4 gpm) more hydraulic flow.
- The J.I. Case 831 suits road haulage better on this data: 20% (5.0 km/h / 3.1 mph) more top speed.
Generated by rule set compare@4 from the figures on the side-by-side table, allowed by route “the same stated configuration”. Measured figures are compared only with measured, claimed only with claimed, at the same test condition; differences within each figure’s tolerance are not called.
What decides it, question by question?
| Question | RP-21 Super (A) | 831 | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 47.2 kW (63.3 hp)Traktorenlexikon, “Bührer RP 21 Super (A)” | 47.3 kW (63.4 hp)Traktorenlexikon, “Case 831” | EvenEven on power at the PTO shaft (both power at the PTO, claimed): the difference is under the 10% threshold for claimed figures, too small to call. |
| Which turns a litre of fuel into more work at the shaft? | — | — | No figureNo call on fuel efficiency at the shaft: no figure on record for the RP-21 Super (A) and the 831. |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the RP-21 Super (A) and the 831. |
| Which pumps more oil for implements? | 19.5 L/min (5.2 gpm)Traktorenlexikon, “Bührer RP 21 Super (A)” | 58.7 L/min (15.5 gpm)Traktorenlexikon, “Case 831” | AheadThe J.I. Case 831 has 201% more hydraulic flow (39.2 L/min / 10.4 gpm) than the Bührer RP-21 Super (A) (both pump flow, as stated by the source). |
| Which lifts more on the three-point hitch? | 2,200 kg (4,850 lb)Traktorenlexikon, “Bührer RP 21 Super (A)” | — | No figureNo call on three-point lift: no figure on record for the 831. |
| Which is heavier, for traction? | 2,634 kg (5,807 lb)Traktorenlexikon, “Bührer RP 21 Super (A)” | 3,241 kg (7,145 lb)Traktorenlexikon, “Case 831” | Ahead (a fact, not an advantage)The J.I. Case 831 is 23% heavier (607 kg / 1,338 lb) than the Bührer RP-21 Super (A) (both unladen weight, as stated by the source). |
| Which may carry more ballast and load? | — | — | No figureNo call on maximum permissible mass: no figure on record for the RP-21 Super (A) and the 831. |
| Which has the wider choice of gears? | 15Traktorenlexikon, “Bührer RP 21 Super (A)” | 8Traktorenlexikon, “Case 831” | AheadThe Bührer RP-21 Super (A) has 88% more forward gears (7 gears) than the J.I. Case 831 (both forward gears, as stated by the source). |
| Which offers a creeper range? | — | — | No figureNo call on a creeper range: not stated for the RP-21 Super (A) and the 831. |
| Which is faster on the road? | 25 km/h (15.5 mph)Traktorenlexikon, “Bührer RP 21 Super (A)” | 30 km/h (18.6 mph)Traktorenlexikon, “Case 831” | AheadThe J.I. Case 831 has 20% more top speed (5.0 km/h / 3.1 mph) than the Bührer RP-21 Super (A) (both top speed forward, as stated by the source). |
| Which offers more PTO speeds? | 540 rpmTraktorenlexikon, “Bührer RP 21 Super (A)” | 540/1000 rpmTraktorenlexikon, “Case 831” | AheadThe J.I. Case 831 offers 1000 rpm at the PTO, which the Bührer RP-21 Super (A) does not (as stated by the sources). |
| Which PTO runs independently of the ground drive? | independentTraktorenlexikon, “Bührer RP 21 Super (A)” | independentTraktorenlexikon, “Case 831” | EvenEven on PTO independence: every PTO is independent. |
| Which drives on both axles? | 2WD / 4WDTraktorenlexikon, “Bührer RP 21 Super (A)” | 2WDTraktorenlexikon, “Case 831” | AheadThe Bührer RP-21 Super (A) is available with four-wheel drive; the J.I. Case 831 is two-wheel drive (as stated by the sources). |
| Which is newer, and what about parts? | 1969–1975 | 1960–1969 | Ahead (a fact, not an advantage)The Bührer RP-21 Super (A) is newer: production began 9 years later. We hold no parts-availability data, so there is no call on parts. |
What does this mean in plain words?
- The J.I. Case 831 has 201% more hydraulic flow (39.2 L/min / 10.4 gpm) than the Bührer RP-21 Super (A) (both pump flow, as stated by the source).
- The J.I. Case 831 is 23% heavier (607 kg / 1,338 lb) than the Bührer RP-21 Super (A) (both unladen weight, as stated by the source).
- The Bührer RP-21 Super (A) has 88% more forward gears (7 gears) than the J.I. Case 831 (both forward gears, as stated by the source).
- The J.I. Case 831 has 20% more top speed (5.0 km/h / 3.1 mph) than the Bührer RP-21 Super (A) (both top speed forward, as stated by the source).
- The J.I. Case 831 offers 1000 rpm at the PTO, which the Bührer RP-21 Super (A) does not (as stated by the sources).
- The Bührer RP-21 Super (A) is available with four-wheel drive; the J.I. Case 831 is two-wheel drive (as stated by the sources).
- The Bührer RP-21 Super (A) is newer: production began 9 years later. We hold no parts-availability data, so there is no call on parts.
- Even on power at the PTO shaft (both power at the PTO, claimed): the difference is under the 10% threshold for claimed figures, too small to call.
- Even on PTO independence: every PTO is independent.
- No figure on record for every machine, so no call on: fuel efficiency at the shaft, drawbar power, three-point lift, maximum permissible mass and a creeper range.
← Every figure for both machines, side by side, with sources