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.. Crane of structure: by driving points. Buy one for the central drive Tadano 35 tons crane, which uses an electric motor to drive the long drive shaft on both sides of Active Wheel; the other for each drive that active on both sides of each wheel with a motor drive. Medium and small more using a combination of overhead crane brakes, gear units and motors into one of the "triple play" drive mode, the large overhead crane lifting capacity of the ordinary for ease of installation and adjustment, the driving device often used universal coupling .