The SD9 bulldozer is a high-drive crawler bulldozer with elastic suspension, hydraulic mechanical transmission and full hydraulic operation. Efficient power-external split-flow hydraulic mechanical torque converter, single-lever operated planetary power shift transmission and pilot-assisted work unit operation. The drive sprocket high and modular design is the most prominent feature, significantly improving the life of the transmission system, easy to repair and maintain. The ergonomically designed operating system is light, labor-saving and accurate. The three-level electronic monitoring and the international standard-compliant dumping protection driver’s cab are safe and comfortable to drive. It is an ideal machine for large-scale earthwork construction in transportation, desert, oilfield, electric power, mining and port.