Cleveland Tractor began as "Cleveland Motor Plow Company" v. 1916, founded by Rollin H. and Clarence G. White. Cleveland "20" was one of the company's first tractors. It is known also as Model "R" (1916-1917). White renamed the company "Cleveland Tractor Company", and so by 1918 Cletrac was born. Although White Motor Corporation appeared late on the tractor scene, it was and old, established business. White sewing machines were first made in 1866, followed by steam cars. Then came gas-powered cars and trucks and finally tractors. Important innovation, which remained unique to Cletrac, was differential steering.
The first Cletracs were advertised as "Geared to the ground" to emphasize their superior traction over conventional wheeled machines. In the 1920s, Crawler tractors (equipped with continuous roller belts over cogged wheels) were gaining in popularity, especially Cletracs. Cletracs were excellent tractors, sold well, and remained a popular make until the end of the Cletrac Company in the 1940s. Cletrac, with one exception (the GG General), made only crawlers.

Some crawler tractors listed below were manufactured by the Oliver Corporation. These models have been listed under the Cletrac section, because Oliver purchased Cletrac and these models remained in production during the change in management.

MODEL AG - 4 cylinder