Allis-Chalmers, together with the United tractor company, introduced a completely new tractor, model U, in 1929. It was designed for tractor buyers who already owned a Fordson. Initially, the engine was a 4.6-liter Continental, later replaced by a 4.9-liter Waukesha. Based on this, Allis-Chalmers developed its own 5.2-liter engine in 1936. This overhead valve engine was rated in Finland at 37 horsepower at 1200 rpm. It could run on both gasoline and kerosene. The U model initially had 3+1 gears, and from 1935 onward 4+1. A road speed of 17.8 kilometers per hour was made possible by pneumatic tires, which came on the U as the first tractor in the world in 1932. Steel wheels remained alongside for a long time as a cheaper option. The pulling power of the rubber-tired version was a quarter higher. The clutch had a diameter of 12 inches.

Alongside the U, from 1930 to 1941, the All-Crop model UC was offered, which had front wheels side by side under the front end.

In 1936, alongside the U, a larger model A was introduced, which replaced the earlier model E. The A had a 7.6-liter gasoline engine. The main purpose of this large, belt-driven tractor was to operate threshing machines. As combine harvesters became more common, the market disappeared, and the next time All-Crop offered such a large tractor was in 1953.

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