Heinrich Lanz D 2539-Gas
Built: 1941–1943 · Series: HRG 9
More machines from model year 1941
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Heinrich Lanz HRG 9 (D 2539-Gas): water-cooled single-cylinder tractor for wood-gas and petrol operation, 29.3 kW and 4,980 kg from the years 1941 to 1943
During the Second World War, Heinrich Lanz of Mannheim converted part of its Bulldog range to substitute fuels, since mineral oil was reserved primarily for the military. The HRG 9 series was among the larger versions able to run on either wood gas or petrol.
Read on 3 more paragraphs
The D 2539-Gas is powered by a water-cooled single-cylinder engine that runs on wood gas or, alternatively, on petrol, producing 40 hp, or 29.3 kW, at 750 rpm. At a weight of 4,980 kg, a length of 3,910 mm, a height of 2,500 mm, a width of 2,160 mm and a wheelbase of 2,515 mm, the machine reaches a top speed of 32.8 km/h.
The dual-fuel design allowed a switch to petrol if the gas supply failed, an important safety consideration in wartime when fuel supplies were uncertain. Wood-gas operation required an upstream generator that gasified wood under oxygen-starved conditions into a combustible gas, which was then fed to the engine like a gaseous fuel. Farmers using such dual-fuel tractors typically kept a reserve tank of petrol for exactly this contingency.
When buying such a wartime tractor, the condition of the cylinder and piston matters, since gas operation left different deposits than pure oil operation, along with the radiator and water pump for leaks. The gearbox, clutch and brakes should be checked for wear; spare parts for this rare wartime variant are now practically only available from collectors' stocks.
Sources: SpecCodex-Register: Kennwerte des Modells Heinrich Lanz D 2539-Gas
Technical data
Engine
| Fuel | Holz/Benzincorrect |
|---|---|
| Power | 40 hp (29.3 kW)correct |
| Rated speed | 750 rpmcorrect |
| Cylinders | 1correct |
| Bore | 225 mmcorrect |
| Stroke | 260 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,910 mmcorrect |
|---|---|
| Width | 2,160 mmcorrect |
| Height | 2,500 mmcorrect |
| Wheelbase | 2,515 mmcorrect |
| Ground clearance | 245 mmcorrect |
| Unladen weight | 4,980 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 5V/1Rcorrect |
| Front tyres | 7.00-20correct |
| Rear tyres | 10.50-24correct |
| Top speed | 32.8 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 149correct |
Where this model stands
Power-to-weight ratio: 5.9 kW/t (29 kW / 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 2539-Gas have?
The Heinrich Lanz D 2539-Gas delivers 40 hp.
How much does the Heinrich Lanz D 2539-Gas weigh?
The unladen weight is 4,980 kg.
What engine does the Heinrich Lanz D 2539-Gas have?
1 cylinders, Holz/Benzin.
How fast does the Heinrich Lanz D 2539-Gas go?
Top speed is 32.8 km/h.
What are the dimensions of the Heinrich Lanz D 2539-Gas?
3,910 mm × 2,160 mm × 2,500 mm.
When was the Heinrich Lanz D 2539-Gas built?
Production years: 1941–1943.
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: 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.
