Mercedes Benz Baureihe 401
1 model in this series
Mercedes-Benz Unimog U 25 (series 401): four-cylinder engine rated at 18 kW, built from 1953 to 1956, top speed 52 km/h.
The Unimog U 25 of the 401 series belongs to the early Unimog years and was built by Mercedes-Benz at its Gaggenau plant between 1953 and 1956. The designation U 25 refers to its 25 hp output and stood at the beginning of Unimog history as an off-road all-purpose vehicle for agriculture, noticeably smaller and lighter than the later, larger Unimog lines.
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The water-cooled four-cylinder engine displaces 1,767 cm³ and produces 25 hp (18 kW) at 2,350 rpm. At an unladen weight of just 1,780 kg, a wheelbase of 1,720 mm and a width of 1,630 mm, the U 25 reaches a top speed of 52 km/h. At 3,520 mm long and 2,050 mm high, it is markedly more compact than the later Unimog lines.
At 52 km/h the U 25 stays within the 60 km/h limit of the T tractor licence class. The comparatively small four-cylinder engine of 1,767 cm³ reflects the Unimog's original design as a light, agile working tool for smaller farms, before lines with larger engines and higher pulling power followed.
When buying such an early Unimog, the condition of the bodywork and frame matters most, since vehicles of this age have often been heavily restored or repaired with parts from other models. The engine, injection pump and early tyre fitment should be checked for originality and function. Spare parts for such old Unimog model codes are considerably scarcer than for the later, more common lines.
Sources: SpecCodex-Register: Kennwerte des Modells Unimog U 25, Mercedes-Benz
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