6 material differences · fewer than 12
Tractor oneBührer 61351975–1978No measured PTO figureTractor twoHürlimann D-550 Hydrostat1974No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1975–1978; 1974–1974). 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
6 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | 6135 | D-550 Hydrostat | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 133 hp | 133.0 hp | — |
| Engine declared | — | Mercedes-Benz 352 A | — |
| Displacement declared | — | 5.68 L | — |
| Maximum torque declared | 317 lb·ft · 430 N·m | — | — |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 16.8 mph · 27 km/h | +8% D-550 Hydrostat |
| Clutch declared | Pedal operated dry Buerhrer twin disc clutch as driving clutch | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 10.3 gpm · 39.0 L/min | 13.7 gpm · 52.0 L/min | +33% D-550 Hydrostat |
| Pressure declared | 2,845 psi · 196 bar | 2,987 psi · 206 bar | — |
| Rear PTO speeds declared | 540/800 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 8,488 lb · 3,850 kg | 9,480 lb · 4,300 kg | +12% D-550 Hydrostat |
| Maximum permissible mass declared | 14,330 lb · 6,500 kg | — | — |
| Wheelbase declared | 103.5–107.5 in · 2,630–2,730 mm | 114.6 in · 2,910 mm | differs |
| Length declared | 166.5 in · 4,230 mm | 174.4 in · 4,430 mm | — |
| Width declared | 81.9 in · 2,080 mm | 88.6 in · 2,250 mm | +8% D-550 Hydrostat |
| Ground clearance declared | 15.0–15.7 in · 380–400 mm | — | — |
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 6135 sources
- Source: Traktorenlexikon, “Bührer 6135”
- Source: Traktorenlexikon, “Bührer 6135 (A)”
Hürlimann D-550 Hydrostat sources
- Source: Traktorenlexikon, “Hürlimann D 550 Hydrostat”