This tractor has been produced since 1920 by the American company Cletrac. The tractor was used mainly for agricultural work. Its feature was a completely innovative track system, which, in fact, is the ancestor of modern tracked tracks. It used a roller chain, but lacked track rollers and a front idler (idler). Each link of the track had a channel running along its entire length, and along which the roller chain could move freely. This design allowed the track to work with little or no lubrication.
Another innovation was that the drive track sprocket was raised high above the ground. This design move minimized damage from uneven ground and stones.
The track width and ground clearance of the Model F could be changed. This allowed the Cletrac tractor to be used in completely different jobs, and also increased the cross-country ability of the equipment.
The tractor body was a single structure in which the engine, gearbox and differentials were integrated, and all lubricants were poured into one single point. This gave the tractor increased stability, strength and compactness.
The Cletrac Model F tractor was powered by a 16 hp 4-cylinder engine, but having only one forward and one reverse gear made it difficult to operate. In total, exactly 300 of these machines were produced.