Since 1949, Deutz began transitioning to air-cooled engines in their tractors. The first new model was the single-cylinder F1L 514, which had a 15 hp engine. It had 4+1 gears and the transmission was Deutz’s own – the same as in the previous model. The F1L 514 was very short in design. The electrical system was 12 volts.

In 1951, an updated model was introduced with 5+1 gears and a top speed of 24 km/h on roads. As an optional extra, a lower speed range was available, which gave 10+2 gears. A differential lock was standard.

In 1952, the smallest model introduced was the 11-horsepower F1L 612. Its transmission was located behind the rear axle. It had 6+3 gears. The seat could be turned backwards for rearward work. In addition to the standard 180 cm wheelbase, the model was also available with a 165 cm wheelbase. In 1958, the small model received a new 712-series engine and the power increased to 13 horsepower.

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