Lanz HM
Built: 1923–1925 · Series: Other models
Lanz – other Bulldog models from Mannheim: the collective page of the Bulldog, HL, HM and HP types, single-cylinders of 3.8 to 6.4 litres, 6 to 16 kW, running on tar oil, crude oil, paraffin and diesel
This page gathers the Lanz Bulldog types the register could not assign to their own range: Bulldog, HL, HM and HP. Heinrich Lanz AG of Mannheim, a farm-machinery maker since 1859, launched the Bulldog in 1921 with its single-cylinder two-stroke hot-bulb engine, the first field tractor fit for mass production; in 1956 John Deere took over the works, which remains Deere's largest tractor plant outside North America to this day.
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The register lists here 4 versions with 5.9 to 16.1 kW or 8 to 12 hp from the throughout single-cylinder engine of 3,818 to 6,400 cm³ displacement at rated speeds of 420 to 500 rpm. Unladen weights range from 1,150 to 3,330 kg, lengths from 2,050 to 3,180 mm, widths from 1,250 to 1,900 mm and heights from 2,130 to 2,345 mm; fuels used were tar oil, crude oil, paraffin and diesel.
The Bulldog's hot-bulb engine burned practically any available raw fuel, making the tractor independent of diesel shortages and prices – a decisive advantage for farmers from the 1920s to the 1950s that helped make the Bulldog the most widely built German field tractor of its era.
On a used example, the condition of the hot bulb, cylinder liner and water jacket, tightness of the oil sump, condition of the large flywheel, and rust on chassis, mudguards and bonnet after decades of use count; parts for the single-cylinder Bulldogs are available through specialist Lanz Bulldog workshops and vintage-machinery dealers.
Sources: SpecCodex register, model data: Lanz (weitere Modelle)
Technical data
Engine
| Fuel | Teeröl, Rohöl, Petroleum u.a.correct |
|---|---|
| Power | 8 hp (5.9 kW)correct |
| Rated speed | 500 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 3,818 cm³correct |
| Cooling | evaporative coolingcorrect |
Dimensions and weights
| Length | 2,050 mmcorrect |
|---|---|
| Width | 1,250 mmcorrect |
| Unladen weight | 1,150 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Front tyres | 520 x 110correct |
| Rear tyres | 735 x 130correct |
| Top speed | 5.2 km/hcorrect |
Origin and approval
| Units built | 250correct |
|---|
Where this model stands
Power-to-weight ratio: 5.1 kW/t (6 kW / 1.1 t)
Power class: Compact (< 40 hp)
Stronger than 1% 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 Lanz HM have?
The Lanz HM delivers 8 hp.
How much does the Lanz HM weigh?
The unladen weight is 1,150 kg.
What engine does the Lanz HM have?
1 cylinders, 3,818 cm³ displacement, Teeröl, Rohöl, Petroleum u.a..
How fast does the Lanz HM go?
Top speed is 5.2 km/h.
What are the dimensions of the Lanz HM?
2,050 mm × 1,250 mm.
When was the Lanz HM built?
Production years: 1923–1925.
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.
- 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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 16 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: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
