Mercedes Benz U 120
Built: 1975–1977 · Series: 425
More machines from model year 1975
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Mercedes-Benz 425 – Unimog U 120 and U 1500 from Gaggenau: a six-cylinder of 5,675 cm³, 87.8 to 110 kW (120 to 150 hp), 5,235 to 5,940 kg, torque 358 to 461 Nm, portal axles for high ground clearance
The Unimog has been built by Mercedes-Benz (Daimler-Benz) mainly at the Gaggenau plant since the early 1950s and is used as a universal implement carrier for agriculture, municipal service and forestry. The type number 425 denotes a medium Unimog series, within which the model designations U 120 and U 1500 give the approximate power class in hp. Characteristic of the Unimog are the portal axles that give high ground clearance, along with power take-offs and hydraulic couplings at front and rear for interchangeable implements.
Read on 3 more paragraphs
The register lists 2 versions with 87.8 to 110 kW (120 to 150 hp) from six-cylinder engines of 5,675 cm³, unladen weights of 5,235 to 5,940 kg, lengths of 4,750 to 4,870 mm, widths of 2,300 to 2,320 mm and heights of 2,640 to 2,685 mm; torque ranges from 358 to 461 Nm at rated speeds of 2,550 to 2,600 rpm.
Unlike pure farm tractors, a Unimog of this class is built to switch between fieldwork, road transport and implement-carrier duty, and is accordingly used as much by farmers as by municipalities and public works depots for winter service, mowing and transport work.
When buying used, check the condition of the portal axles and their seals, the operation of the front and rear PTO, the tightness of the multi-couplings for the hydraulics, rust on the frame and cab, and the tyres; parts continue to be supplied through the Mercedes-Benz and Unimog network.
Sources: SpecCodex register, model data: Mercedes-Benz 425, Unimog (Mercedes-Benz, Hersteller)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 120 hp (87.8 kW)correct |
| Rated speed | 2,600 rpmcorrect |
| Torque | 358 Nmcorrect |
| Speed at max. torque | 1,800 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 5,675 cm³correct |
| Bore | 97 mmcorrect |
| Stroke | 128 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 4,750 mmcorrect |
|---|---|
| Width | 2,320 mmcorrect |
| Height | 2,640 mmcorrect |
| Wheelbase | 2,810 mmcorrect |
| Ground clearance | 550 mmcorrect |
| Unladen weight | 5,235 kgcorrect |
Drivetrain and chassis
| Drive | four-wheel drivecorrect |
|---|---|
| Gearbox | 8V/(Rcorrect |
| Front tyres | 14, 5-24 MPTcorrect |
| Rear tyres | 14, 5-24 MPTcorrect |
| Top speed | 86 km/hcorrect |
Working data
| Fuel tank capacity | 160 lcorrect |
|---|
Origin and approval
| Construction | frame constructioncorrect |
|---|
Other data
| Linkage category | Cat IIIcorrect |
|---|---|
| PTO speed | 540/1000 rpmcorrect |
Where this model stands
Power-to-weight ratio: 16.8 kW/t (88 kW / 5.2 t)
Power class: Large (100–180 hp)
Stronger than 74% 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 120 have?
The Mercedes Benz U 120 delivers 120 hp.
How much does the Mercedes Benz U 120 weigh?
The unladen weight is 5,235 kg.
What engine does the Mercedes Benz U 120 have?
6 cylinders, 5,675 cm³ displacement, Diesel.
How fast does the Mercedes Benz U 120 go?
Top speed is 86 km/h.
What are the dimensions of the Mercedes Benz U 120?
4,750 mm × 2,320 mm × 2,640 mm.
When was the Mercedes Benz U 120 built?
Production years: 1975–1977.
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 27 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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Other models in this series
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Tractor in 3D section
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