SD6G bulldozer companies introduce the use of diesel technology, the United States Jimmy Carter produced C6121ZG05 engine with a torque reserve coefficient, characterized by strong anti-overload; torque converter for the external shunt multi-purpose Hydro-mechanical converter with high efficiency, high-performance wide-area characteristics. For the planetary gear transmission, power shift gearbox has a smooth shifting, manipulating light; steering, braking using the form linked brake system for hydraulic power; the final transmission gear position with great changes in the design, carrying capacity, high long service life, while the final drive with bearing clearance-free adjustment of structure, easy maintenance; balance beam with lubrication-free structure, and lower maintenance costs; the instrument panel and the cab are connected using a buffer greatly enhanced the electrical system, air-conditioning system components life, improved driver comfort; machine rational layout and broad vision. Working Device Hydraulic System Devices valve external, easy maintenance, reliable. Hydraulic oil tank pressure tank, an increase of the oil absorption capacity of the hydraulic system to prevent the hydraulic system to produce cavitation.