At present, most domestic and foreign ride on pallet trucks has a wide field of vision gantry, hoisting hydraulic cylinder placed by the middle placed on both sides. Hydraulic cylinders are placed in two positions: one is the hydraulic cylinder in the door frame behind; the other is the hydraulic cylinder in the mast outside the test. Mast generally divided into standard type, two-type or three-section type. Domestic light duty stacker lifting height is generally between 2 ~ 5m, and to 3m and 3m of the majority, while the foreign electric forklift lifting height is generally between 2 ~ 6m, due to the high degree of three-dimensional warehouse, so lifting Height of 3m or more, the demand for electric forklifts much higher than the domestic.