Deutz (KHD) D 50.1S (D 55) or Fiat 550 (DT)?
Which should you choose?
The data can’t decide this. Power at the PTO shaft cannot be compared: the D 50.1S (D 55) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 550 (DT) 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 50.1S (D 55) | 550 (DT) | Call |
|---|---|---|---|
| Which puts more power through the PTO shaft? | 38.1 kW (51.1 hp)Traktorenlexikon, “Deutz D 50.1S (D 55)” | 38.2 kW (51.2 hp)Traktorenlexikon, “Fiat 550/550 DT” | Not comparableNot comparable on power at the PTO shaft: the D 50.1S (D 55) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 550 (DT) 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 50.1S (D 55) and the 550 (DT). |
| Which pulls harder at the drawbar? | — | — | No figureNo call on drawbar power: no figure on record for the D 50.1S (D 55) and the 550 (DT). |
| Which pumps more oil for implements? | — | 21.8 L/min (5.8 gpm)Traktorenlexikon, “Fiat 550/550 DT” | No figureNo call on hydraulic flow: no figure on record for the D 50.1S (D 55). |
| Which lifts more on the three-point hitch? | 2,200 kg (4,850 lb)Traktorenlexikon, “Deutz D 50.1S (D 55)” | 1,820 kg (4,012 lb)Traktorenlexikon, “Fiat 550/550 DT” | Not comparableNot comparable on three-point lift: the D 50.1S (D 55): lift at an unstated point, as stated by the source (Traktorenlexikon, “Deutz D 50.1S (D 55)”); the 550 (DT): lift at the hitch ends, as stated by the source (Traktorenlexikon, “Fiat 550/550 DT”) — not the same quantity, basis and condition. |
| Which is heavier, for traction? | 2,270 kg (5,004 lb)Traktorenlexikon, “Deutz D 50.1S (D 55)” | 2,060 kg (4,542 lb)Traktorenlexikon, “Fiat 550/550 DT” | Ahead (a fact, not an advantage)The Deutz D 50.1S (D 55) is 10% heavier (210 kg / 463 lb) than the Fiat 550 (DT) (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 D 50.1S (D 55) and the 550 (DT). |
| Which has the wider choice of gears? | 8Traktorenlexikon, “Deutz D 50.1S (D 55)” | 8 to 12Traktorenlexikon, “Fiat 550/550 DT” | 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 50.1S (D 55) and the 550 (DT). |
| Which is faster on the road? | 20 km/h (12.4 mph) to 28 km/h (17.4 mph)Traktorenlexikon, “Deutz D 50.1S (D 55)” | 25 km/h (15.5 mph)Traktorenlexikon, “Fiat 550/550 DT” | EvenEven on top speed (both top speed forward, as stated by the source): the figures vary by configuration and the ranges overlap. |
| Which offers more PTO speeds? | 540/1060 rpmTraktorenlexikon, “Deutz D 50.1S (D 55)” | 540 rpmTraktorenlexikon, “Fiat 550/550 DT” | 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 50.1S (D 55) and the 550 (DT). |
| Which drives on both axles? | 2WDTraktorenlexikon, “Deutz D 50.1S (D 55)” | Two-wheel or four-wheel driveTraktorenlexikon, “Fiat 550/550 DT” | AheadThe Fiat 550 (DT) is available with four-wheel drive; the Deutz D 50.1S (D 55) is two-wheel drive (as stated by the sources). |
| Which is newer, and what about parts? | 1962–1965 | 1968–1978 | Ahead (a fact, not an advantage)The Fiat 550 (DT) is newer: production began 6 years later. We hold no parts-availability data, so there is no call on parts. |
What does this mean in plain words?
- The Deutz D 50.1S (D 55) is 10% heavier (210 kg / 463 lb) than the Fiat 550 (DT) (both unladen weight, as stated by the source).
- The Fiat 550 (DT) is available with four-wheel drive; the Deutz D 50.1S (D 55) is two-wheel drive (as stated by the sources).
- The Fiat 550 (DT) is newer: production began 6 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 figures vary by configuration and the ranges overlap.
- Even on PTO speeds: the same speeds (540 rpm).
- Not comparable on power at the PTO shaft: the D 50.1S (D 55) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft; the 550 (DT) has only engine power (gross or net not stated), claimed — a different quantity from power at the shaft.
- Not comparable on three-point lift: the D 50.1S (D 55): lift at an unstated point, as stated by the source (Traktorenlexikon, “Deutz D 50.1S (D 55)”); the 550 (DT): lift at the hitch ends, as stated by the source (Traktorenlexikon, “Fiat 550/550 DT”) — not the same quantity, basis and condition.
- No figure on record for every machine, so no call on: fuel efficiency at the shaft, drawbar power, hydraulic flow, maximum permissible mass, a creeper range and PTO independence.
← Every figure for both machines, side by side, with sources