Fahr started tractor manufacturing in 1938. It was able to maintain production until 1944. After the war, production continued in 1948 with the model D 28. The engine was a 2-cylinder water-cooled Güldner diesel, and the transmission was the same 5+1 as in the wartime wood gasifier models.

In 1949, a series of three tractor models was introduced. The D 28 was succeeded by the D 30, and below it came the D 15 and D 22. The rounded hood differed from earlier models in that the grille was divided into six sections. The smallest model was a completely new design; Fahr had not previously manufactured such a small tractor. The engine was a 2-cylinder Güldner, and the portal-type rear axle and transmission were ZF's 5+1. The differential lock was standard. Electric start was initially an optional extra. The middle model used a Deutz diesel instead of a Güldner, as in the preceding T 22 model. Compared to the D 28, the D 30 had 2 additional horsepower, a new gear shift, and a lifting device.

In spring 1951, the more powerful D 17 replaced the D 15, and the D 25 replaced the D 22. Also new was a 12-volt electrical system. Alongside these appeared the high-wheel versions D 17 H and D 25 H. In autumn 1951, the D 30 was replaced by the D 30 L, which had a Deutz air-cooled engine and a new front axle similar to that of the F 15.

In autumn 1951, the D 22 P was introduced, which was the same as the D 17 except for a more powerful engine.

In 1952, the single-cylinder D 12 was introduced, which, apart from the engine, was largely the same tractor as the D 17. In the revised 1953 D 12 N, however, it had a lighter construction gearbox.

In Fahr's model designations, N meant a revised model, H a high version, P a portal axle, L air cooling, and W water cooling.

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