Lanz D 8506
Built: 1934–1955 · Series: (Ackerluft, HR 7)
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Lanz (Ackerluft, HR 7) – the D 8506: a single-cylinder hot-bulb engine producing 22 kW, approved for several fuels, and a 3,650 kg weight as a classic Lanz Bulldog
Lanz, in full Heinrich Lanz AG, was based in Mannheim and became part of John Deere in 1956. The company name is inseparable from the Lanz Bulldog, distinguished by a horizontal single-cylinder two-stroke engine with a hot bulb in place of an injector. The D 8506 of the HR 7 series belongs to this Bulldog family.
Read on 3 more paragraphs
The D 8506 is cooled by thermosyphon action, meaning without a water pump, purely through the natural circulation of heated coolant, and runs on diesel oil, heavy oil, diesel fuel, kerosene or vegetable oil. At 540 rpm it produces 22 kW, or 30 hp. The machine weighs 3,650 kg, reaches 17.7 km/h, and measures 3,400 mm in length, 1,792 mm in width and 2,185 mm in height.
The hot bulb replaces the spark plug and injector with a glowing pre-combustion chamber that triggers ignition without an external spark, which allows the engine to run on very different, even lower-grade, fuels. The low speed of 540 rpm combined with a large flywheel smooths out the firing pulses of the single cylinder and, running slowly, delivers a high, even torque for heavy draught work such as ploughing.
When buying a used Bulldog of this type, the condition of the hot bulb and its preheating device matters most, since spare parts for this now-rare component are barely available new any more. The thermosyphon cooling requires an unobstructed coolant circuit free of deposits, and the flywheel and clutch should be checked for cracks after decades of use.
Sources: SpecCodex-Register: Kennwerte des Modells D 8506
Technical data
Engine
| Fuel | Gasöl, Schweröl, Diesel, Petroleum, Pflanzenöl, …correct |
|---|---|
| Power | 30 hp (22 kW)correct |
| Rated speed | 540 rpmcorrect |
| Cylinders | 1correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,400 mmcorrect |
|---|---|
| Width | 1,792 mmcorrect |
| Height | 2,185 mmcorrect |
| Wheelbase | 1,975 mmcorrect |
| Ground clearance | 315 mmcorrect |
| Unladen weight | 3,650 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6/2-manual gearbox gearboxcorrect |
| Forward gears | 6correct |
| Reverse gears | 2correct |
| Front tyres | 7-20 AS Frontcorrect |
| Rear tyres | 12, 75-28 AScorrect |
| Top speed | 17.7 km/hcorrect |
Working data
| Fuel tank capacity | 90 lcorrect |
|---|
Origin and approval
| Construction | frameless unit constructioncorrect |
|---|
Where this model stands
Power-to-weight ratio: 6 kW/t (22 kW / 3.6 t)
Power class: Compact (< 40 hp)
Stronger than 16% 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 Lanz D 8506 have?
The Lanz D 8506 delivers 30 hp.
How much does the Lanz D 8506 weigh?
The unladen weight is 3,650 kg.
What engine does the Lanz D 8506 have?
1 cylinders, Gasöl, Schweröl, Diesel, Petroleum, Pflanzenöl, ….
How fast does the Lanz D 8506 go?
Top speed is 17.7 km/h.
What are the dimensions of the Lanz D 8506?
3,400 mm × 1,792 mm × 2,185 mm.
When was the Lanz D 8506 built?
Production years: 1934–1955.
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.