Crane pulley what's the hook? usually lifting hooks, pulleys and other parts hanging on the rope hoist. Since the lifting hook is a commonly used tool in lifting machine, his safety is very important. There is one pulley the crane hook discard criteria for your reference:
2. wear up to 10% the risk of cross-sectional dimensions of the original;
3. increased by more than 15% the original size;
4. changing the hook body deformation exceed 10 °;
5. risk part of the lifting hook or pulley hook for crane neck plastic deformation;
6. grab threaded corrosion;
7. hook casing wear damage more than 50% should replace bushings; worn shaft hooked 5% the original size, you should replace the spindle.