8 material differences · fewer than 12
Tractor oneRenault 4211972–1977No measured PTO figureTractor twoRenault 511968–1972No measured PTO figure
Which should you choose?
Read our verdict on the 421 and the 51 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
8 material differences · 4 fields identical or within 5%, which is not counted as material
| Field | 421 | 51 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 41.4 hp | 41.4 hp | — |
| Engine declared | MWM D 327-3 | — | — |
| Displacement declared | 2.83 L | — | — |
| Maximum torque declared | 127 lb·ft · 172 N·m | — | — |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 15.5 mph · 25 km/h | — |
| Clutch declared | Dry VERTO double clutch | Two-stage pedal operated dry FERODO double clutch type 11 LFGM 29 | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 6.8 gpm · 25.9 L/min | — | — |
| Three-point lift, at the coupling points declared | 4,497 lb · 2,040 kg | 4,409 lb · 2,000 kg | — |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 4,817 lb · 2,185 kg | 3,527 lb · 1,600 kg | +37% 421 |
| Wheelbase declared | 78.0 in · 1,982 mm | 70.9 in · 1,800 mm | +10% 421 |
| Length declared | 130.4 in · 3,312 mm | 123.6 in · 3,140 mm | +5% 421 |
| Width declared | 66.1–83.9 in · 1,680–2,130 mm | 57.5 in · 1,460 mm | differs |
| Ground clearance declared | 15.7 in · 400 mm | 15.0 in · 380 mm | +5% 421 |
| Turning radius, braked declared | 10.9 ft · 3.31 m | 9.5 ft · 2.90 m | +14% 421 |
| Fuel tank declared | 50.7 qt · 48.0 L | 58.1 qt · 55.0 L | +15% 51 |
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.
Renault 421 sources
Source
- Source: Traktorenlexikon, “Renault 421 R7431”
- Source: Traktorenlexikon, “Renault 461 R7441”
Renault 51 sources
Source
- Source: Traktorenlexikon, “Renault 51 R7256”