The SD8N bulldozer is a crawler bulldozer with a drive wheel high, hydraulic mechanical drive, elastic suspension and hydraulic control. Power external split type hydraulic mechanical torque converter, planetary power shift transmission. Pilot controlled work unit hydraulic system. The modular design of the whole machine is the most prominent structural feature. The control system is light, labor-saving and accurate, and adopts an electronic monitoring system. With a variety of working devices and attachments, it is an ideal machine for a variety of large earth and stone construction.