Crane safety devices: from the weight indicator. From the weight indicator is set in the basic arm together side (ie, the right side of the cab) 50 ton crane much money, the operator sitting in the control room will be able to clearly observe the 50 t crane, can accurately indicate the boom The elevation and the corresponding conditions allowed the rated capacity crane. Crane of structure: by driving points. One for the focus to drive a 50-ton crane company, 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 .