1. The leaming angle between the sheave and the wire rope cannot over 5 grade.
2. When sheeve block works, the lifting of fixed load is prohibited.
3. The operator should read the instruction carefully.

4. No overloading.
5. The lifting point should be placed at the bottom of the hook instead of the hook toe.

6. The pulley block should be inspected termly, the inspection period should no more than one time per year, if possible, could be done a static load test per year.
7. After inspection, the parts should be cleared and lubricaded and then assembly.
8. When disassemly and assemble, the parts should not crack avoiding the parts deformation.
9. If the pulley block don’t use for long time, it should be cleared and lubricaded, and keep well.

If the lifting beam happens to any one situation as below, it should be replaced.
1. The middle axle center-sections diameter wearing capacity is bigger than or equal to the original axis diameter 2 %.
2. Axis wearing capacity is bigger than or equal to the original bushing wall thickness 20%.
3. Radial pulley groove wear greater than or equal to 25% of the diameter of wire rope, or the groove wall wear thickness greater than or equal to 10% of the original size, or the groove uneven wear greater than or equal to 3mm.