Wille GERW-Diesel-Stier Typ 20
Built: 1950–1951 · Series: GERW-Diesel-Stier
More machines from model year 1950
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Wille GERW-Diesel-Stier: the diesel version of the Hamburg-Bergedorf motor plough Stier, Type 20 and Type 21 with single- and twin-cylinder diesel engine, 1.0 to 2.0 litres displacement, 1,400 to 1,650 kg unladen weight
This page lists the diesel version of the Stier motor plough from the Hamburg farm-machinery maker Georg R. Wille, built in Hamburg-Bergedorf between the 1920s and 1950s. The GERW-Diesel-Stier was a single-axle motor plough for tillage in agriculture and horticulture, offered in two versions: the Type 20 with a single-cylinder diesel engine and the Type 21 with a twin-cylinder engine whose displacement is exactly double that of the Type 20.
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The register lists here 2 versions with 1,020 to 2,040 cm³ displacement from one to two cylinders, unladen weights of 1,400 to 1,650 kg, lengths of 2,400 to 2,600 mm, a width of 1,500 mm and heights of 1,550 to 1,585 mm; the engines run at 1,300 or 1,500 revolutions per minute.
Motor ploughs such as the Stier replaced the working horse on smaller and medium-sized farms across much of the first half of the twentieth century, before standard tractors increasingly displaced them from the 1950s; north German makers such as Wille served mainly the regional market in agriculture and horticulture with robust, simply built motor ploughs.
When buying one of these historic machines used, the condition of engine and injection pump, rust on the frame and sheet metal, the function of clutch and gearbox, and the completeness of plough and attachments count; spare parts today can only be sourced through specialist collectors and restorers of historic farm machinery.
Sources: SpecCodex register, model data: Wille GERW-Diesel-Stier
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 12 hpcorrect |
| Rated speed | 1300/1500 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 1,020 cm³correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 2,400 mmcorrect |
|---|---|
| Width | 1,500 mmcorrect |
| Height | 1,550 mmcorrect |
| Wheelbase | 1,550 mmcorrect |
| Ground clearance | 275 mmcorrect |
| Unladen weight | 1,400 kgcorrect |
Drivetrain and chassis
| Drive | four-wheel drivecorrect |
|---|---|
| Gearbox | 4/1correct |
| Front tyres | 6, 50 x 20correct |
| Rear tyres | 6, 50 x 20correct |
| Top speed | 20 km/hcorrect |
Origin and approval
| Construction | frame constructioncorrect |
|---|
Where this model stands
Power-to-weight ratio: 6.3 kW/t (9 kW / 1.4 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 Wille GERW-Diesel-Stier Typ 20 have?
The Wille GERW-Diesel-Stier Typ 20 delivers 12 hp.
How much does the Wille GERW-Diesel-Stier Typ 20 weigh?
The unladen weight is 1,400 kg.
What engine does the Wille GERW-Diesel-Stier Typ 20 have?
1 cylinders, 1,020 cm³ displacement, Diesel.
How fast does the Wille GERW-Diesel-Stier Typ 20 go?
Top speed is 20 km/h.
What are the dimensions of the Wille GERW-Diesel-Stier Typ 20?
2,400 mm × 1,500 mm × 1,550 mm.
When was the Wille GERW-Diesel-Stier Typ 20 built?
Production years: 1950–1951.
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 18 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
Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
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