Heinrich Lanz 12/20 HN
Built: 1932–1933 · Series: HN 1
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Heinrich Lanz HN 1 – the Bulldog 12/20 HN in Kombi and Verkehr versions from Mannheim: 4.8-litre single-cylinder, 8.8 kW, multi-fuel operation
The HN 1 is the Bulldog 12/20 HN from Mannheim in three versions: the base version, the Kombi variant and the Verkehr (road) variant. The 12/20 designation follows the German tax-horsepower notation common at the time, where the first number gives the taxable and the second the actual engine output – a system also used on other German vehicles of that period.
Read on 3 more paragraphs
The register lists here 3 versions with a uniform 8.8 kW from the uniform single-cylinder of 4,767 cm³ displacement at rated speeds of 760 to 800 rpm. Unladen weights range from 2,100 to 3,150 kg, lengths from 2,740 to 2,912 mm, widths from 1,600 to 1,640 mm and heights from 1,600 to 2,030 mm; all versions run on multiple fuels.
As a smaller Bulldog, the HN 1 provided an entry into motorisation on mid-size and smaller farms, with the multi-fuel engine likewise allowing operation on cheap fuels; the Kombi and Verkehr suffixes mark construction variants for different forms of use.
On a used example, the condition of the hot bulb and cylinder liner, tightness of the cooling, condition of flywheel and starting crank, and rust on mudguards and chassis count; parts for the single-cylinder Bulldog engine are available through specialist Lanz Bulldog mechanics and vintage-machinery dealers.
Sources: SpecCodex register, model data: Heinrich Lanz HN 1
Technical data
Engine
| Fuel | Vielstoffcorrect |
|---|---|
| Power | 12 hp (8.8 kW)correct |
| Rated speed | 760 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 4,767 cm³correct |
| Bore | 170 mmcorrect |
| Stroke | 210 mmcorrect |
| Injection pressure | 80 barcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 2,860 mmcorrect |
|---|---|
| Width | 1,600 mmcorrect |
| Height | 2,020 mmcorrect |
| Wheelbase | 1,647 mmcorrect |
| Ground clearance | 255 mmcorrect |
| Unladen weight | 2,100 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 3V/1Rcorrect |
| Front tyres | 740 x 125correct |
| Rear tyres | 1.060 x 300correct |
| Top speed | 6.04 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|
Where this model stands
Power-to-weight ratio: 4.2 kW/t (9 kW / 2.1 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 Heinrich Lanz 12/20 HN have?
The Heinrich Lanz 12/20 HN delivers 12 hp.
How much does the Heinrich Lanz 12/20 HN weigh?
The unladen weight is 2,100 kg.
What engine does the Heinrich Lanz 12/20 HN have?
1 cylinders, 4,767 cm³ displacement, Vielstoff.
How fast does the Heinrich Lanz 12/20 HN go?
Top speed is 6 km/h.
What are the dimensions of the Heinrich Lanz 12/20 HN?
2,860 mm × 1,600 mm × 2,020 mm.
When was the Heinrich Lanz 12/20 HN built?
Production years: 1932–1933.
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 22 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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