Caterpillar ® medium and heavy class track-type dozers have a configuration with the elevated drive sprocket. This arrangement eliminates the transfer of shock loads on the track gearbox, reduces abrasive wear of teeth and allows replacement of crawler transmission and gearbox without removing the cabin. This significantly increases the efficiency of machine by reducing operating costs and machine downtime. Independent roller suspension of undercarriage ensures smooth movement over rough terrain and firm adhesion of the track shoe to the surface.

This makes it possible to realize 15% more tractive effort, compared with a rigid undercarriage. Cat D8R and D7R Bulldozer and can be equipped with the latest Cat System One undercarriage. The chain with rotating bushings used in this undercarriage for the first time in the world. It allowed eliminating sliding motion of the chain fingers on the tooth slot, significantly reducing abrasive wear and eliminating the need for the re-swaging of fingers to rotate bushings.

All elements of System One undercarriage optimized for increased resources of the chain and is a subject to be replaced at the same time to reduce downtime associated with repair of undercarriage. Frictional or differential systems of rotation are proposed. Classical friction system provides maximum efficiency in the forward / backward. Differential system allows moving with a full load in a turn without losing tractive effort. The splitter of torsion torque, consisting of hydraulic transformer and planetary reduction gear unit provides higher efficiency than a conventional torque converter and 2 times faster response to load changes, allowing overcoming obstacles without losing speed. Caterpillar ® Bulldozers can be equipped with automatic control of blade Accugrade, allowing executing high precision grading without prior marking.