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In 1924 IH introduced the Farmall tractor, a smaller general-purpose tractor, to fend off competition from the Ford Motor Company’s Fordson tractors. The Farmall was the first tractor in the United States to incorporate a tricycle-like design (or row-crop front axle), which could be used on tall crops such as cotton and corn.
Following the introduction of the Farmall, IH introduced several similar looking “F Series” models that offered improvements over the original design (the original model became known as the “Regular”).
In 1932 IH produced their first diesel engine, in the McCormick-Deering TD-40 crawler. This engine started on gasoline, then switched over to diesel fuel. Diesel engines of this era were difficult to start in cold weather, and using gasoline allowed the engine to start easily and thoroughly warm up before making the switch to diesel in all weather conditions. In 1935 this engine was put in the International Harvester WD-40, becoming the first diesel tractor on wheels in North America (the world’s first diesel tractor was the German Benz-Sendling BS 6, introduced in 1922).