Güldner A 20 - AF 30

Founded in 1904, Güldner was a significant and reputable diesel engine manufacturer. In 1938, it introduced its first tractor, the simple angular and gray A 20. Its engine was a single-cylinder water-cooled diesel. The transmission was a 4+1 from Prometheus or ZF. The electrical system was standard, with power take-off and pulley as optional extras. A moderate number of 1,500 A 20 tractors were produced before the factory was nearly leveled by bombing.

During the war, the two-cylinder A 30 was developed, which was refined into the production model A 28 in 1946. The transmission was a ZA 4+1. The top speed had increased to 20 km/h. The front axle had a transverse leaf spring pack.

In 1948, the model was raised by 11 cm and changed to green, becoming the AF 30. The engine gained a couple more horsepower, and the transmission was now a Fahr 5+1. A hydraulic lift was now available as an option. New standard features included steering brakes, a differential lock, and a suspended drawbar. During the AF 30 production period, the hood received rounder shapes and a thermostat was added to the cooling system.