Heinrich Lanz D 9500
Built: 1934–1939 · Series: HN 8
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Heinrich Lanz D 9500: multi-fuel single-cylinder Bulldog with thermosiphon cooling, 38 hp at 540 to 630 rpm and 3,300 kg weight, from 1934 to 1939
The D 9500 belongs to the HN 8 series from Heinrich Lanz of Mannheim from the 1930s and is one of the manufacturer's larger Bulldog field tractors with the characteristic horizontal single-cylinder engine.
Read on 3 more paragraphs
The D 9500 is powered by a multi-fuel single-cylinder engine with thermosiphon cooling, producing 38 hp at a rated speed of 540 to 630 rpm. At a weight of 3,300 kg, a length of 3,440 mm, a height of 2,315 mm and a width of 1,820 mm, with a wheelbase of 2,036 mm, the machine is a heavy tractor whose top speed of 6.2 km/h was built purely for draft work.
Thermosiphon cooling relies solely on the natural circulation of heated water between the engine and the radiator, without a water pump as an additional, wear-prone component, but it only works reliably with sufficiently wide pipes and a free flow of air. The multi-fuel engine could run, depending on availability, on crude oil, diesel fuel and similar heavy fuels, making the machine independent of any single fuel type.
When buying a D 9500, the condition of the radiator pipes and the radiator itself matters, since thermosiphon cooling depends on unobstructed flow, along with the hot bulb and its preheating device. Also worth checking are the clutch and gearbox for wear noises and the brakes; parts for this older Lanz Bulldog are usually still obtainable from specialist suppliers.
Sources: SpecCodex-Register: Kennwerte des Modells Heinrich Lanz D 9500
Technical data
Engine
| Fuel | Vielstoffcorrect |
|---|---|
| Power | 38 hpcorrect |
| Rated speed | 540/630 rpmcorrect |
| Cylinders | 1correct |
| Bore | 0.8correct |
| Injection pressure | 80 barcorrect |
| Cooling | Thermosyphonkühlungcorrect |
Dimensions and weights
| Length | 3,440 mmcorrect |
|---|---|
| Width | 1,820 mmcorrect |
| Height | 2,315 mmcorrect |
| Wheelbase | 2,036 mmcorrect |
| Ground clearance | 305 mmcorrect |
| Unladen weight | 3,300 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 3V/1Rcorrect |
| Front tyres | 840 x 840 Eisencorrect |
| Rear tyres | 1300 x 1300 Eisencorrect |
| Top speed | 6.2 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|
Where this model stands
Power-to-weight ratio: 8.5 kW/t (28 kW / 3.3 t)
Power class: Compact (< 40 hp)
Stronger than 23% 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 9500 have?
The Heinrich Lanz D 9500 delivers 38 hp.
How much does the Heinrich Lanz D 9500 weigh?
The unladen weight is 3,300 kg.
What engine does the Heinrich Lanz D 9500 have?
1 cylinders, Vielstoff.
How fast does the Heinrich Lanz D 9500 go?
Top speed is 6.2 km/h.
What are the dimensions of the Heinrich Lanz D 9500?
3,440 mm × 1,820 mm × 2,315 mm.
When was the Heinrich Lanz D 9500 built?
Production years: 1934–1939.
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.
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 19 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) · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
