Heinrich Lanz HRK
5 models in this series
Heinrich Lanz HRK D1550 to D1581 – the Bulldog from Mannheim with hot-bulb single cylinder: uniformly 36.6 kW at a constant 750 rpm, multi-fuel operation from crude oil to petrol, 4.77 to 5.9 t
Heinrich Lanz AG of Mannheim built the Bulldog from 1921, one of the best-known German tractors of all, driven by a horizontal single-cylinder hot-bulb engine on the two-stroke cycle – a rugged, slow-running design that processed practically any combustible fuel. The HRK range with its D type designations stands for the heavy versions of this Bulldog principle, in which the models differ chiefly in frame length, bodywork and weight, while engine output and rated speed stayed constant across the whole range – a hallmark of the unchanged basic hot-bulb engine.
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The register lists 5 versions uniformly at 36.6 kW at a constant 750 rpm, service weights of 4,770 to 5,900 kg, lengths of 2,800 to 3,070 mm, widths of 1,865 to 2,400 mm and heights of 2,320 to 2,380 mm. Fuel operation is recorded as multi-fuel-capable for four models, and for one model as running on gas oil, lignite tar oil, diesel oil, paraffin oil or petrol.
The Lanz Bulldog shaped German agriculture for decades and became a generic name for standing-engine tractors generally; its ability to run on low-grade and changing fuels made it especially sought after in wartime and post-war years. In 1956 John Deere took over a majority stake in Lanz and gradually folded the brand into its own tractor production.
On these historic machines, the condition of hot bulb and cylinder, the tightness of the two-stroke engine, the function of clutch and reversing gear, and corrosion on frame and sheet-metal parts count above all; spare parts are the exclusive domain of specialist Bulldog restorers and vintage-tractor clubs.
Sources: SpecCodex register, model data: Heinrich Lanz HRK, John Deere (Rechtsnachfolger Heinrich Lanz)
Models compared
5 of 5 models.
| D 15501937–1939 | D 15601937–1946 | D 15611937–1946 | D 15711937–1946 | D 15811937–1946 | |
|---|---|---|---|---|---|
| Power | 36.6 kW | 36.6 kW | 36.6 kW | 36.6 kW | 36.6 kW |
| Rated speed | 750 rpm | 750 rpm | 750 rpm | 750 rpm | 750 rpm |
| Cylinders | 1 | 1 | 1 | 1 | 1 |
| Top speed | 8 km/h | 7.7 km/h | 7.7 km/h | 7.7 km/h | 7.7 km/h |
| Length | 3,030 mm | 2,800 mm | 3,070 mm | 2,800 mm | 2,920 mm |
| Width | 1,865 mm | 1,960 mm | 1,960 mm | 2,400 mm | 2,200 mm |
| Height | 2,320 mm | 2,340 mm | 2,380 mm | 2,320 mm | 2,340 mm |
| Unladen weight | 4,770 kg | 5,000 kg | 5,280 kg | 5,900 kg | 5,200 kg |
Models
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
D 1550
With the D 1550, Heinrich Lanz offers a model from the HRK series. Production: 1937–1939. The engine delivers 50 hp...
D 1560
The D 1560 from Heinrich Lanz is part of the HRK series. Production: 1937–1946. The engine delivers 50 hp (36.6 kW),...
D 1561
The HRK series from Heinrich Lanz includes the D 1561. Production: 1937–1946. The engine delivers 50 hp (36.6 kW),...
D 1571
The Heinrich Lanz D 1571 belongs to the HRK series. Production: 1937–1946. The engine delivers 50 hp (36.6 kW), has...
D 1581
The Heinrich Lanz D 1581 is a model in the HRK series. Production: 1937–1946. The engine delivers 50 hp (36.6 kW),...