Crane main performance parameters indicators: speed. Luffing speed: luffing speed means stable motion state 35 t crane, hanging Buying minimum rated load 35 tons luffing crane in the plane, from the most significant to the horizontal displacement of the minimum amplitude of the average linear velocity. Walking speed: walking speed refers to the road status, mobile cranes hanging steady speed rated load. Rotation speed: the speed of rotation refers to a stable state of motion, the crane to rotate around its center of rotation speed. Crane of structure: crane four categories. Bridge type crane hoisting machinery such as beams and so on. Jib type crane as fixed rotary cranes, tower cranes, truck cranes, tire cranes, crawler cranes. Cable Crane as lifts. Small light lifting equipment such as: Jacks, pneumatic hoists, electric hoists, balancing gourd (aka balance suspended), winches, etc..