Early Deutz-Fahr engines were used as horse-drawn generators for power threshers and hay balers. In 1927, they launched their first mass-produced Deutz MTH 222 tractor. Deutz Company converted water-cooled engines into air-cooled ones during World War II for better dependability for military equipment. The air-cooled engine remained their trademark until the 1990s. The company’s first self-propelled combine harvester was presented in 1952.