ALLIS-CHALMERS D-17 or David Brown 780 Selectamaric?
Which should you choose?
The data can’t decide this. Power at the PTO shaft cannot be compared: the D-17 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 780 Selectamaric has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
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 | D-17 | 780 Selectamaric | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 34.4 kW (46.1 hp)Traktorenlexikon, “Allis-Chalmers D 17” | 34.3 kW (46.0 hp)Traktorenlexikon, “David Brown 780” | Not comparableNot comparable on power at the PTO shaft: the D-17 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 780 Selectamaric has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft. |
| 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 D-17 and the 780 Selectamaric. |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the D-17 and the 780 Selectamaric. |
| Which pumps more oil for implements? | 39.7 L/min (10.5 gpm)Traktorenlexikon, “Allis-Chalmers D 17” | — | No figureNo call on hydraulic flow: no figure on record for the 780 Selectamaric. |
| Which lifts more on the three-point hitch? | — | 1,306.000 kg (2,879 lb)Traktorenlexikon, “David Brown 780” | No figureNo call on three-point lift: no figure on record for the D-17. |
| Which is heavier, for traction? | 2,208 kg (4,868 lb)Traktorenlexikon, “Allis-Chalmers D 17” | 1,683 kg (3,710 lb)Traktorenlexikon, “David Brown 780” | Ahead (a fact, not an advantage)The ALLIS-CHALMERS D-17 is 31% heavier (525 kg / 1,157 lb) than the David Brown 780 Selectamaric (both unladen weight, as stated by the source). |
| Which may carry more ballast and load? | — | 2,380 kg (5,247 lb)Traktorenlexikon, “David Brown 780” | No figureNo call on maximum permissible mass: no figure on record for the D-17. |
| Which has the wider choice of gears? | 8Traktorenlexikon, “Allis-Chalmers D 17” | 6 to 12Traktorenlexikon, “David Brown 780” | EvenEven on forward gears (both forward gears, as stated by the source): the figures vary by configuration and the ranges overlap. |
| Which offers a creeper range? | — | — | No figureNo call on a creeper range: not stated for the D-17 and the 780 Selectamaric. |
| Which is faster on the road? | 20 km/h (12.4 mph)Traktorenlexikon, “Allis-Chalmers D 17” | 22 km/h (13.7 mph)Traktorenlexikon, “David Brown 780” | EvenEven on top speed (both top speed forward, as stated by the source): the difference is under the 10% threshold, too small to call. |
| Which offers more PTO speeds? | 540 rpmTraktorenlexikon, “Allis-Chalmers D 17” | 540 rpmTraktorenlexikon, “David Brown 780” | EvenEven on PTO speeds: the same speeds (540 rpm). |
| Which PTO runs independently of the ground drive? | — | — | No figureNo call on PTO independence: not stated for the D-17 and the 780 Selectamaric. |
| Which drives on both axles? | 2WDTraktorenlexikon, “Allis-Chalmers D 17” | 2WDTraktorenlexikon, “David Brown 780” | EvenEven on drive: all two-wheel drive. |
| Which is newer, and what about parts? | 1957–1967 | 1967–1971 | Ahead (a fact, not an advantage)The David Brown 780 Selectamaric is newer: production began 10 years later. We hold no parts-availability data, so there is no call on parts. |
What does this mean in plain words?
- The ALLIS-CHALMERS D-17 is 31% heavier (525 kg / 1,157 lb) than the David Brown 780 Selectamaric (both unladen weight, as stated by the source).
- The David Brown 780 Selectamaric is newer: production began 10 years later. We hold no parts-availability data, so there is no call on parts.
- Even on forward gears (both forward gears, as stated by the source): the figures vary by configuration and the ranges overlap.
- Even on top speed (both top speed forward, as stated by the source): the difference is under the 10% threshold, too small to call.
- Even on PTO speeds: the same speeds (540 rpm).
- Even on drive: all two-wheel drive.
- Not comparable on power at the PTO shaft: the D-17 has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 780 Selectamaric has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
- No figure on record for every machine, so no call on: fuel efficiency at the shaft, drawbar power, hydraulic flow, three-point lift, maximum permissible mass, a creeper range and PTO independence.
← Every figure for both machines, side by side, with sources