Rotation causes the hook

   Causes rotation causes the crane hook internal and external factors.
       Hook rotating internal reasons but also its root causes.
       Lifting machinery (such as:wire rope winch electric hoists, chain hoists) rope used either type, size, grade, will be in force when torque is generated. Torque is due to the rope caused by manufacturing methods, first wire helically twisted together to form a stock, and then a few shares and spirally twisted together to form a rope. When the force, the wires and stocks will be straightened, but when lifting operations rope ends are fixed,load chain so that torque is formed inside the rope. Another source of torque is formed wire pitch in use for some time becomes long, so that it is fixed at the end of the case, the rope is unstressed will produce a torque, the torque the presence of a rotating hook assembly trend .
       On the other hand there are many external factors that lead directly hook rotation, such as lifting process of manpower hook external force such as the wind turning drivers operate heavy swinging hook and the instability that led to rotating hook,hoist and trolley hook for wear around the way resulting imbalance hook hook rotation.