Heinrich Lanz D 7506-Gas
Built: 1941–1942 · Series: HNG 3
More machines from model year 1941
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Heinrich Lanz D 7506-Gas: single-cylinder Bulldog converted to wood-gas power, 4,767 cc, 20 hp/14.6 kW and 2,925 kg weight, from the war years 1941/1942
The D 7506-Gas belongs to the HNG 3 series from Heinrich Lanz of Mannheim from the war years 1941 and 1942, when scarce fuel rations forced many German vehicles to convert to wood-gas power. The machine is a version of the well-known Lanz Bulldog field tractor converted to a wood-gas generator.
Read on 3 more paragraphs
The D 7506-Gas is powered by a water-cooled single-cylinder engine of 4,767 cc, running on wood gas, producing 20 hp, or 14.6 kW, at 850 rpm. At a weight of 2,925 kg, a length of 3,010 mm, a height of 2,010 mm and a width of 1,600 mm, with a wheelbase of 1,680 mm, the machine is a medium-weight tractor whose top speed of 15.1 km/h was somewhat lower than the normally fuelled version because of the wood-gas installation.
A wood-gas generator gasifies solid fuels such as wood into a combustible gas that drives the actual combustion engine, and was a common emergency solution during the war years when liquid fuels were scarce. The lower output compared with similar Bulldog engines of the same size running on oil or diesel resulted from the lower energy content of the wood gas produced compared with liquid fuel.
When buying a D 7506-Gas, the condition of the wood-gas generator and its piping matters most, as far as this installation survives, along with the radiator and coolant hoses of the single-cylinder engine. Also worth checking are the clutch and gearbox for wear noises and the brakes; a surviving wood-gas installation is today a rare piece of technical history, for which parts are only obtainable from specialist collectors.
Sources: SpecCodex-Register: Kennwerte des Modells Heinrich Lanz D 7506-Gas
Technical data
Engine
| Fuel | Holzcorrect |
|---|---|
| Power | 20 hp (14.6 kW)correct |
| Rated speed | 850 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 4,767 cm³correct |
| Bore | 170 mmcorrect |
| Stroke | 210 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,010 mmcorrect |
|---|---|
| Width | 1,600 mmcorrect |
| Height | 2,010 mmcorrect |
| Wheelbase | 1,680 mmcorrect |
| Ground clearance | 270 mmcorrect |
| Unladen weight | 2,925 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6V/2Rcorrect |
| Front tyres | 6.00-20correct |
| Rear tyres | 11.25-24correct |
| Top speed | 15.1 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 1,861correct |
Where this model stands
Power-to-weight ratio: 5 kW/t (15 kW / 2.9 t)
Power class: Compact (< 40 hp)
Stronger than 7% 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 D 7506-Gas have?
The Heinrich Lanz D 7506-Gas delivers 20 hp.
How much does the Heinrich Lanz D 7506-Gas weigh?
The unladen weight is 2,925 kg.
What engine does the Heinrich Lanz D 7506-Gas have?
1 cylinders, 4,767 cm³ displacement, Holz.
How fast does the Heinrich Lanz D 7506-Gas go?
Top speed is 15.1 km/h.
What are the dimensions of the Heinrich Lanz D 7506-Gas?
3,010 mm × 1,600 mm × 2,010 mm.
When was the Heinrich Lanz D 7506-Gas built?
Production years: 1941–1942.
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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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
Turn the model, look inside and click an assembly — each one is explained.
