11 material differences · fewer than 12
Tractor oneFahr D 1811955–1958No measured PTO figureTractor twoMassey Ferguson MF 251961–1963No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1955–1958; 1961–1963). 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
11 material differences · 3 fields identical or within 5%, which is not counted as material
| Field | D 181 | MF 25 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 23.6 hp | 24.7 hp | — |
| Engine declared | MWM AKD-12 Z or AKD-112 Z | Perkins A 4.107 | differs |
| Displacement declared | 1.81 L | 1.75 L | — |
| Maximum torque declared | 66 lb·ft · 89 N·m | 74 lb·ft · 100 N·m | +12% MF 25 |
| Transmission | |||
| Top speed declared | 8.0 mph · 12.8 km/h | 12.4 mph · 20 km/h | +56% MF 25 |
| Clutch declared | — | Pedal operated dry air-cooled MF double clutch | — |
| Hydraulics & hitch | |||
| Pump flow declared | — | 2.5 gpm · 9.6 L/min | — |
| Pressure declared | 3,129 psi · 216 bar | 1,991 psi · 137 bar | +58% D 181 |
| Rear PTO speeds declared | 600 rpm | 540 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 2,778 lb · 1,260 kg | 3,241 lb · 1,470 kg | +17% MF 25 |
| Maximum permissible mass declared | 4,299 lb · 1,950 kg | — | — |
| Wheelbase declared | 68.4 in · 1,737 mm | 72.0 in · 1,830 mm | +5% MF 25 |
| Length declared | 106.2 in · 2,697 mm | 114.6 in · 2,910 mm | +8% MF 25 |
| Width declared | 42.2 in · 1,072 mm | 63.0 in · 1,600 mm | +49% MF 25 |
| Ground clearance declared | 16.7 in · 425 mm | 13.4 in · 340 mm | +25% D 181 |
| Turning radius, braked declared | 9.4 ft · 2.85 m | 9.0 ft · 2.75 m | — |
| Fuel tank declared | 31.7 qt · 30 L | 47.6 qt · 45 L | +50% MF 25 |
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.
Fahr D 181 sources
- Source: Traktorenlexikon, “Fahr D 181”
- Source: Traktorenlexikon, “Fahr D 180 H”
Massey Ferguson MF 25 sources
- Source: Traktorenlexikon, “Massey Ferguson MF 25”
- Source: Traktorenlexikon, “Massey Ferguson MF 30”
- Source: Traktorenlexikon, “Massey Ferguson MF 25 S/V”