The first DDR tractors were the 40-horsepower RS 01 Pionier and the 30-horsepower RS 03 Aktivist. However, the model that reached the highest production numbers was the RS 04/30 from the Schlepperwerk Nordhausen, introduced in 1953, which had a 3.0-liter 30-horsepower engine. Its successor, introduced in 1956, was the RS 14/30 Favorit, which after receiving a new 3.28-liter engine became known as the RS 14/30 Famulus.

In 1960, an updated model of the RS 14 was introduced, called the Famulus 36. The tractor had the previously introduced 3.28-liter 2-cylinder engine, which, like the earlier models, was an air-cooled diesel. The engine speed was increased from 1500 to 1600 rpm. According to a book about DDR machines, the engine's lifespan was approximately 1000 hours. There were a total of 10+2 gears across two ranges. The Famulus was colored either orange-red or gray-green.

There was a recognized need for a more powerful tractor, and alongside it the 46-horsepower Famulus 46 was introduced. Its engine was water-cooled and the speed was 2000 rpm. Despite having water cooling, the engine’s durability was very poor. Water-cooled engines were also used in the 36 models.

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