Mercedes Benz U 25
Built: 1953–1956 · Series: Baureihe 401
More machines from model year 1953
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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.
Read on 3 more paragraphs
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
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 25 hp (18 kW)correct |
| Rated speed | 2,350 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 1,767 cm³correct |
| Bore | 75 mmcorrect |
| Stroke | 100 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,520 mmcorrect |
|---|---|
| Width | 1,630 mmcorrect |
| Height | 2,050 mmcorrect |
| Wheelbase | 1,720 mmcorrect |
| Ground clearance | 370 mmcorrect |
| Unladen weight | 1,780 kgcorrect |
Drivetrain and chassis
| Drive | four-wheel drivecorrect |
|---|---|
| Gearbox | 6V / 2Rcorrect |
| Front tyres | 6.50-20 AScorrect |
| Rear tyres | 6.50-20 AScorrect |
| Top speed | 52 km/hcorrect |
Working data
| Fuel tank capacity | 40 lcorrect |
|---|
Origin and approval
| Construction | Rechteckrahmen aus U-Profilcorrect |
|---|---|
| Units built | 11,446correct |
Where this model stands
Power-to-weight ratio: 10.1 kW/t (18 kW / 1.8 t)
Power class: Compact (< 40 hp)
Stronger than 11% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Mercedes Benz U 25 have?
The Mercedes Benz U 25 delivers 25 hp.
How much does the Mercedes Benz U 25 weigh?
The unladen weight is 1,780 kg.
What engine does the Mercedes Benz U 25 have?
4 cylinders, 1,767 cm³ displacement, Diesel.
How fast does the Mercedes Benz U 25 go?
Top speed is 52 km/h.
What are the dimensions of the Mercedes Benz U 25?
3,520 mm × 1,630 mm × 2,050 mm.
When was the Mercedes Benz U 25 built?
Production years: 1953–1956.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 24 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · How we check the data
Tractor in 3D section
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