After the 150,000 Lanz Bulldogs, the models introduced in 1952 featured a central flywheel engine with a compression ratio raised to 11. Instead of hot bulb starting, the engine was now started with gasoline and an electric starter. The electrical system was changed to 12 volts. As before, the two-stroke engine had more than one horizontal cylinder. The mid-range HN model D 3506 was replaced by the 28-horsepower D 2806, and a year later came the D 3606. The transmission was the same 6+2 gear gearbox as its predecessor. Unlike the smaller models, the mid-range still had a drum clutch. A hydraulic lifting device was an optional extra. Alongside these models, faster road traffic versions were offered. The new engine could be exchanged for the old Bulldog as a package, which also included a radiator, exhaust pipe, and front axle.

In 1955, the intermediate model D 3206 was introduced.

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