The traveling system of the full-hydraulic grader of Sany Heavy Industry Co., Ltd. is hydrostatically driven, and its transmission route is: engine → variable pump → variable motor → balance box → driving wheel. The variable pump and variable motor closed hydraulic system replaces the torque converter, gearbox, drive shaft and drive axle of the mechanical grader, greatly simplifying the transmission route. Its service brake also adopts a shoe brake, and the brake is installed on the driving wheel.