Lanz SLL
Built: 1907–1918 · Series: B-Reihe
Lanz B series – the SLL: a coal-fired single-cylinder engine producing 20.5 kW, rear-wheel drive and a 9,100 kg weight from the era before the Lanz Bulldog
Lanz, in full Heinrich Lanz AG, was based in Mannheim. The SLL of the B series dates from 1907 to 1918, the period before the 1921 Bulldog for which the company later became known. Drive runs solely through the rear wheels; there was as yet no driven front axle of the kind later four-wheel-drive tractors would have.
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The SLL carries a water-cooled single-cylinder engine run on coal, producing 20.5 kW, or 28 hp, at only 200 rpm. The machine weighs 9,100 kg and rolls on tyres measuring 1,100 by 200 mm at the front and 1,700 by 450 mm at the rear, dimensions pointing to large, solid wheels rather than today's rubber tyres.
Coal-fired drive relied on gas generated from the fuel in its own generator, a common alternative before the First World War to imported liquid fuels. At only 200 rpm the engine runs far slower than later diesel or Bulldog drives, generating its torque from the sheer mass of its moving parts rather than from speed.
A machine of this age and character today is above all an object of historic-technology preservation, not a working implement any more. When acquiring one, the originality of the gas plant and carburettor, the condition of the wheel spokes and rims for cracks, and confirmation that no modern, non-period conversions have been made to the drivetrain all matter for its value.
Sources: SpecCodex-Register: Kennwerte des Modells SLL
Technical data
Engine
| Fuel | Kohlecorrect |
|---|---|
| Power | 28 hp (20.5 kW)correct |
| Rated speed | 200 rpmcorrect |
| Cylinders | 1correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Unladen weight | 9,100 kgcorrect |
|---|
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Front tyres | 1.100 x 200correct |
| Rear tyres | 1.700 x 450correct |
Where this model stands
Power-to-weight ratio: 2.3 kW/t (20 kW / 9.1 t)
Power class: Compact (< 40 hp)
Stronger than 15% 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 SLL have?
The Lanz SLL delivers 28 hp.
How much does the Lanz SLL weigh?
The unladen weight is 9,100 kg.
What engine does the Lanz SLL have?
1 cylinders, Kohle.
When was the Lanz SLL built?
Production years: 1907–1918.
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.
- 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 11 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.