1. It is strictly forbidden to use overload. 2. It is strictly forbidden to use other power operations other than manpower. 3. Before use, it is necessary to confirm that the machine parts are intact, the transmission part and the lifting chain are well lubricated, and the air rotation is normal. 4. Check whether the upper and lower hooks are lined up before the hanging. It is strictly forbidden to hang wrong operations such as the tip. The lifting chain should be suspended vertically. There must be no wrong chain ring.