Mercedes Benz 421
1 model in this series
Mercedes-Benz Unimog U 45 of series 421: a four-cylinder diesel implement carrier producing 33 kW (45 hp), built 1968 to 1971, with an unladen weight of 2,700 kg and a top speed of 53 km/h.
The U 45 of series 421 belongs to the lighter Unimog (Universal-Motor-Gerät) series from Mercedes-Benz. The specific vehicle recorded here dates from 1968 to 1971, a light-duty example.
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The U 45 is powered by a four-cylinder diesel engine with 2,197 cm3 displacement, producing 33 kW (45 hp) at a rated speed of 3,000 rpm. At an unladen weight of 2,700 kg, a wheelbase of 2,250 mm and a width of 1,865 mm, it reaches a top speed of 53 km/h. Height and length are 2,180 mm and 4,005 mm.
With a compact four-cylinder engine and a high rated speed, the U 45 is built for the lighter end of the Unimog range, typical for municipal services, winter road maintenance and smaller farms. As with other Unimog series, portal axles give high ground clearance off-road, and power take-offs front and rear allow work with changing front- and rear-mounted implements as tasks require.
When buying a late-1960s Unimog U 45, check the portal axles and their reduction gearing for oil level and leaks, as well as the function of the front and rear power take-off couplings. The four-cylinder engine is worth checking for compression and oil consumption, and after decades of winter road-salting duty the frame needs a thorough check for corrosion, particularly around the implement mounting points and the load-bearing crossmembers.
Sources: SpecCodex-Register: Kennwerte des Modells Mercedes-Benz Unimog U 45
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