1. Before using the screw jack, it is necessary to understand whether the weight of the lifting object is within the range of use of the hand-operated jack, and overload is strictly prohibited to avoid equipment damage or accidents that can not be lifted by the buckle.

　　2, if the heavy weight exceeds the rated weight, you can operate multiple hand-operated jacks at the same time, it is necessary to keep the load of multiple hand-operated jacks uniform, rise and fall at the same speed, and maintain stability.

　　3, after the lifting of the heavy object, if it can not be lowered in a short time, it must be filled under the heavy object and the lifting height of the same pad as the auxiliary support, so as to avoid damage to the equipment accidents.

　　4. When lifting and landing, the top plate of the hand jack should be in contact with the heavy object, and the area of the base should be in complete contact with the foundation surface to ensure sufficient strength support to prevent the heavy object from slipping.

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