Hubert & Wösner M 3-12
Built: 1957–1958 · Series: M
More machines from model year 1957
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Hubert & Wösner M 3-12: air-cooled single-cylinder diesel engine with 660 cc displacement, 12 hp at 2,000 rpm and a top speed of 20 km/h as a compact small tractor
The M 3-12 belongs to the class of small single-cylinder tractors built during the 1950s for smallholdings, steep terrain and fruit and vine growing. Machines of this kind widely replaced draught animals on small plots at a time when larger, multi-cylinder tractors were too heavy or too expensive.
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The air-cooled single-cylinder diesel engine of 660 cc delivers 12 hp at 2,000 rpm. The design top speed is 20 km/h, unladen weight is 800 kilograms and the wheelbase is 1,550 millimetres — figures typical of a compact, agile small tractor with a short turning circle.
With a design top speed of 20 km/h, the machine falls into the lower part of driving licence class T, which in Germany covers vehicles up to 60 km/h. Air cooling made single-cylinder engines of this kind lower-maintenance and more frost-resistant than water-cooled units, but required clean cooling fins to prevent overheating.
When buying such an old single-cylinder machine, the condition of the cylinder's cooling fins is the first thing to check, as they must be free of oil and caked dirt. Compression, the injection pump and bearing clearance on the crankshaft deserve equal attention, along with corrosion on the steering knuckles and linkage, which is often the real weak point on small tractors of this age. The clutch lining and the play in the steering gear are worth a look as well, since replacement parts for a machine this old and this rare are not always readily available.
Sources: SpecCodex-Register: Kennwerte des Modells M 3-12
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 12 hpcorrect |
| Rated speed | 2,000 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 660 cm³correct |
| Cooling | air-cooledcorrect |
Dimensions and weights
| Wheelbase | 1,550 mmcorrect |
|---|---|
| Unladen weight | 800 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 4v/1rcorrect |
| Front tyres | 4.80-12correct |
| Rear tyres | 7.50-18 AS Farmercorrect |
| Top speed | 20 km/hcorrect |
Origin and approval
| Construction | Lastendreiradcorrect |
|---|---|
| Units built | ca. 100 (inkl. M 3-15)correct |
Where this model stands
Power-to-weight ratio: 11 kW/t (9 kW / 0.8 t)
Power class: Compact (< 40 hp)
Stronger than 2% 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 Hubert & Wösner M 3-12 have?
The Hubert & Wösner M 3-12 delivers 12 hp.
How much does the Hubert & Wösner M 3-12 weigh?
The unladen weight is 800 kg.
What engine does the Hubert & Wösner M 3-12 have?
1 cylinders, 660 cm³ displacement, Diesel.
How fast does the Hubert & Wösner M 3-12 go?
Top speed is 20 km/h.
When was the Hubert & Wösner M 3-12 built?
Production years: 1957–1958.
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 15 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: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.