Heinrich Lanz D 9006
Built: 1943–1945 · Series: HRO
More machines from model year 1943
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Heinrich Lanz HRO (D 9006): water-cooled single-cylinder wood-gas tractor with 29.3 kW and 3,500 kg from the final war years 1943 to 1945
During the Second World War, Heinrich Lanz of Mannheim converted Bulldog series to wood gas, since mineral oil was scarce and reserved for the military. The HRO series was among the versions from these war years powered exclusively by wood gas.
Read on 3 more paragraphs
The D 9006 is powered by a water-cooled single-cylinder engine that produces 40 hp, or 29.3 kW, at 630 rpm, and runs exclusively on wood gas. At a weight of 3,500 kg, a length of 3,855 mm, a height of 2,295 mm, a width of 1,792 mm and a wheelbase of 1,977 mm, the machine reaches a top speed of 18.6 km/h.
An upstream wood-gas generator gasified wood under oxygen-starved conditions into a combustible gas mixture, which was fed to the engine in place of crude oil or petrol. Compared with oil-fired Bulldogs, this operation required regular refilling of wood and cleaning of the generator, but kept motorised pulling power available to agriculture where fuel was scarce. Operating the generator required some practice but no specialist training.
When buying such a wood-gas tractor, the condition of the cylinder and piston matters, since gas operation left different wear traces than oil operation, along with the radiator and water pump for leaks. The gearbox and brakes should be checked for function; spare parts for this rare wartime series can now only be obtained through a circle of collectors.
Sources: SpecCodex-Register: Kennwerte des Modells Heinrich Lanz D 9006
Technical data
Engine
| Fuel | Holzgascorrect |
|---|---|
| Power | 40 hp (29.3 kW)correct |
| Rated speed | 630 rpmcorrect |
| Cylinders | 1correct |
| Bore | 260 mmcorrect |
| Stroke | 260 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,855 mmcorrect |
|---|---|
| Width | 1,792 mmcorrect |
| Height | 2,295 mmcorrect |
| Wheelbase | 1,977 mmcorrect |
| Ground clearance | 300 mmcorrect |
| Unladen weight | 3,500 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6V/2Rcorrect |
| Front tyres | 7.00-20correct |
| Rear tyres | 12.75-28correct |
| Top speed | 18.6 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 1,017correct |
Where this model stands
Power-to-weight ratio: 8.4 kW/t (29 kW / 3.5 t)
Power class: Compact (< 40 hp)
Stronger than 25% 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 9006 have?
The Heinrich Lanz D 9006 delivers 40 hp.
How much does the Heinrich Lanz D 9006 weigh?
The unladen weight is 3,500 kg.
What engine does the Heinrich Lanz D 9006 have?
1 cylinders, Holzgas.
How fast does the Heinrich Lanz D 9006 go?
Top speed is 18.6 km/h.
What are the dimensions of the Heinrich Lanz D 9006?
3,855 mm × 1,792 mm × 2,295 mm.
When was the Heinrich Lanz D 9006 built?
Production years: 1943–1945.
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 21 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.