The Lanz Bulldogs of the HN and HR series were introduced in 1934. The smaller models had a 4.8-liter and the larger ones a 10.3-liter single-cylinder hot bulb engine. The compression ratio was 6:1, and depending on the model, the maximum power speed was between 540 and 760 rpm. Many combustible liquids could be used as fuel. The transmission in models ending with 0 had 3+1 gears, and the top speed was limited to 7 km/h. Models ending with 6 featured a reduction gear that allowed a highway speed of 20 km/h and had a sprung front axle. Models ending with 0 came standard with spiked wheels. The drive clutch was a drum clutch.

In 1937 there were updates, including increased power and the electrical system becoming standard. Depending on the model, the power take-off shaft was available either as an optional or standard feature.

After the war, Lanz tractor production resumed in 1949 initially with the same models as before the war. In 1952, a 12-volt electrical system was introduced.

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