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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 and help everyone work better, the following things need to be paid attention to: 1. Before use, check the rated lifting weight marked on the hook group, and the rated lifting weight must not be less than the actual lifting weight; (If it is not marked or is not marked clearly, the rated lifting weight should be determined through calculation and load test) 2. The surface of the hook group must be smooth and must not have defects such as peeling, marking, acute angles, seams 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 or twisted;

　　4. The hook connection part should be checked 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, the thread corrosion, dangerous sections or the 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 and help everyone work better, the following things need to be paid attention to: 1. Before use, check the rated lifting weight marked on the hook group, and the rated lifting weight must not be less than the actual lifting weight; (If it is not marked or is not marked clearly, the rated lifting weight should be determined through calculation and load test) 2. The surface of the hook group must be smooth and must not have defects such as peeling, marking, acute angles, seams 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 or twisted;

　　4. The hook connection part should be checked 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, the thread corrosion, dangerous sections or the 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.