Heinrich Lanz Kühler-Bulldog
1 model in this series
Heinrich Lanz Kühler-Bulldog (HR 4): water-cooled multi-fuel single-cylinder tractor with a visible front radiator, 16.1 kW and 3,500 kg from the years 1928 to 1929
Heinrich Lanz of Mannheim initially built its Bulldog tractors without a prominent front radiator; the version designated Kühler-Bulldog, by contrast, has a visible, forward-mounted radiator and was powered by a single-cylinder hot-bulb engine that could run on crude oil, gas oil or paraffin.
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The HR 4 is powered by a water-cooled single-cylinder engine that produces 22 hp, or 16.1 kW, at 500 rpm. At a weight of 3,500 kg, a length of 3,000 mm, a height of 2,170 mm, a width of 1,900 mm and a wheelbase of 1,800 mm, the machine reaches a top speed of 7 km/h.
The ability to switch between crude oil, gas oil and paraffin made operation independent of a single source of supply, an important advantage at a time when fuel supply in rural areas was not guaranteed everywhere. The low speed and large displacement delivered the high torque needed for ploughing and pulling work, at a correspondingly low travel speed. Such an engine ran slowly but steadily, which made precise handling during ploughing easier.
When buying, the condition of the hot bulb and cylinder bore, which were stressed differently by switching fuels, matters, along with the tightness of the visible front radiator and water pump. The gearbox and clutch should be checked for noise; spare parts for this early Bulldog version are now only available through specialist collectors.
Sources: SpecCodex-Register: Kennwerte des Modells Heinrich Lanz HR 4
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Tractor in 3D section
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