Heinrich Lanz D 6550
Built: 1933–1934 · Series: HR 6
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Heinrich Lanz HR 6 – Bulldog tractors from Mannheim, D 6506 to D 6550, horizontal single-cylinder rated at 16.1 kW, multi-fuel operation at 540/630 rpm
Heinrich Lanz built the HR 6 Series at its Mannheim plant; the four models D 6506, D 6511, D 6520 and D 6550 all carry the same horizontal single-cylinder engine rated at 16.1 kW. Like the classic Lanz Bulldog tractors, the engine ran on multiple fuels, including lower-grade ones. In 1956, John Deere took over the Mannheim works, which continue to this day as a John Deere plant.
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The register lists here 4 versions with 16.1 kW rated output from the single-cylinder at a rated speed of 540/630 rpm. Unladen weights range from 3,000 to 4,400 kg, length, width and height from 3,000 to 3,370 mm, 1,670 to 2,280 mm and 1,575 to 2,320 mm.
The Lanz Bulldog, with its distinctive slow-running single-cylinder, shaped the image of German agriculture for decades and, thanks to its robustness and simple maintenance, was especially widespread on smaller and mid-sized farms. Parts and technical knowledge for the Bulldog models are still maintained today by an active collector and club scene.
When buying these Bulldog models used, check the condition of the single-cylinder and its ignition system, the tightness of the cooling and fuel systems, the clutch and gearbox, and rust on the frame and bodywork; parts are supplied by specialist Bulldog dealers. Rust and leaks at the radiator usually reveal themselves already during a test run.
Sources: SpecCodex register, model data: Heinrich Lanz HR 6
Technical data
Engine
| Fuel | Vielstoffcorrect |
|---|---|
| Power | 22 hp (16.1 kW)correct |
| Rated speed | 540/630 rpmcorrect |
| Cylinders | 1correct |
| Bore | 225 mmcorrect |
| Stroke | 260 mmcorrect |
| Injection pressure | 80 barcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,000 mmcorrect |
|---|---|
| Width | 1,865 mmcorrect |
| Height | 2,320 mmcorrect |
| Ground clearance | 350 mmcorrect |
| Unladen weight | 4,400 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 3V/1Rcorrect |
| Front tyres | 1.200 x 300correct |
| Rear tyres | 1.200 x 300correct |
| Top speed | 7.28 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 21correct |
Where this model stands
Power-to-weight ratio: 3.7 kW/t (16 kW / 4.4 t)
Power class: Compact (< 40 hp)
Stronger than 9% 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 6550 have?
The Heinrich Lanz D 6550 delivers 22 hp.
How much does the Heinrich Lanz D 6550 weigh?
The unladen weight is 4,400 kg.
What engine does the Heinrich Lanz D 6550 have?
1 cylinders, Vielstoff.
How fast does the Heinrich Lanz D 6550 go?
Top speed is 7.3 km/h.
What are the dimensions of the Heinrich Lanz D 6550?
3,000 mm × 1,865 mm × 2,320 mm.
When was the Heinrich Lanz D 6550 built?
Production years: 1933–1934.
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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Other models in this series
Sources: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
