luffing the luffing cylinder and hydraulic system components

In order to complete construction crane functions, electric hoist manufacturers construction cranes are generally supported by the base portion and the upper portion of vehicle operation, etc., for mobile cranes, the base includes a support portion of the chassis on the road and other load-bearing structure and chassis legs, over head cranes while the chassis also powered through the center of the rotary body to work on the car; the car operation portion includes a turning mechanism on the car to achieve a 360-degree rotating support, slewing gear, rotary hydraulic system consisting of a full rotation