Dump Truck in civil engineering work and often combined with excavators, loaders, conveyor and other construction machinery, constitute loaded, transported, unloaded production line, earthwork, gravel, bulk material handling and transportation work. Dump truck rollover car rear and side tipping points to two, by manipulating the system control rod movement, backward tipping more common, push rod tilting cabs, a few two-way tipping. High-pressure oil through distribution valves, tubing into the lift cylinder, the front cab car safety shield. The engine through the transmission, PTO driven hydraulic pump unit, hydraulic tipping mechanism consists tank car, pump, distribution valves, hydraulic lift cylinders, control valves and tubing, and other components. The engine through the transmission, PTO devices driven hydraulic pump, high-pressure oil through distribution valves, tubing into the lift cylinder, push the piston rod so that the car overturning. After the tipping more common, control rod movement by the operating system, the car can stop at any desired position on the slant. Carriage using its own gravity and hydraulic control reset.