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　　Seventh the crane accessories depend on quality, and threeth the maintenance is based on maintenance. In order to extend the service life of the hook group, the following six points have been specially summarized, hoping to help everyone.

　　1. Before use, check the rated lifting weight marked on the hook group, and the rated lifting weight shall not be less than the actual lifting weight; (If not marked or noted clearly, the rated lifting weight should be determined through calculation and load test)

　　2. The surface of the hook group must be smooth and cannot have defects such as peeling, marking, sharp angles, joints and cracks;

　　3. During use, the sling should be hung to the low hook. If the hook group is directly in the built ring, the hook group cannot be hard. 4. Check the hook connection part regularly to confirm whether the connection is reliable and whether the lubrication is good; 5. The three dangerous sections of the hook group are cleaned with tin oil. If there are cracks on the surface of the hook, thread corrosion, dangerous sections or neck deformation, it should be scrapped; 6. The wear of the dangerous section area of the hook reaches 10%, and the opening degree increases by 15% compared to the original size; if the hook body twists and deformation exceeds 10°, it should be replaced as soon as possible.

　　Seventh the crane accessories depend on quality, and threeth the maintenance is based on maintenance. In order to extend the service life of the hook group, the following six points have been specially summarized, hoping to help everyone.

　　1. Before use, check the rated lifting weight marked on the hook group, and the rated lifting weight shall not be less than the actual lifting weight; (If not marked or noted clearly, the rated lifting weight should be determined through calculation and load test)

　　2. The surface of the hook group must be smooth and cannot have defects such as peeling, marking, sharp angles, joints and cracks;

　　3. During use, the sling should be hung to the low hook. If the hook group is directly in the built ring, the hook group cannot be hard. 4. Check the hook connection part regularly to confirm whether the connection is reliable and whether the lubrication is good; 5. The three dangerous sections of the hook group are cleaned with tin oil. If there are cracks on the surface of the hook, thread corrosion, dangerous sections or neck deformation, it should be scrapped; 6. The wear of the dangerous section area of the hook reaches 10%, and the opening degree increases by 15% compared to the original size; if the hook body twists and deformation exceeds 10°, it should be replaced as soon as possible.