The structure of the engine, chassis and cab of the heavy dump truck is the same as that of the general truck. The carriage can tip backwards or sideways, and the movement of the piston rod is controlled by the control system. The backward tip is more common, and the piston rod is pushed to tip the carriage. A few bidirectional tilts. The high-pressure oil enters the lifting hydraulic cylinder through the distribution valve and the oil pipe, and the cab safety protection plate is provided at the front of the carriage. The engine drives the hydraulic pump through the transmission and the force taking device, and the hydraulic tipping mechanism of the carriage is composed of the oil tank, the hydraulic pump, the distributing valve, the lifting hydraulic cylinder, the control valve and the tubing. The engine drives the hydraulic pump through the transmission and the force taking device, and the high-pressure oil enters the lifting hydraulic cylinder through the distribution valve and the tubing, and pushes the piston rod to make the carriage tip over. Backward tilting is more common, and the movement of the piston rod can be controlled by a control system to stop the carriage in any desired tilting position. The carriage uses its own gravity and hydraulic control to reset.