You can spot our medium and large-size Cat Track Dozers because of our exclusive elevated sprocket design. The elevated sprocket increases productivity, simplifies maintenance, reduces downtime with modular components, and raises final drives and associated power train components out of the work environment, helping to extend drive train life. Today, nine Caterpillar Track Dozers feature the elevated sprocket design: the D5N XL, D6R III, D7R II, D8R, D9R, D10T, D11R, and D11R Carrydozer.