The safety bolt of hydraulic jack is damaged. It is forbidden to use it
2. When the thread wear of screw jack reaches 20%, it is forbidden to use it
3. When the rack wear of rack Jack reaches 20%, it is forbidden to use it
4. The jack shall be set in a flat and solid place and be leveled with a pad wood
5. The jack shall be vertical to the load surface, and the anti-skid cushion shall be added between the top and the contact surface at noon
6. It is forbidden to overload, lengthen the handle or operate more than the rated number of people
7. When using the hydraulic jack, no one shall stand in front of the safety bolt
8. When two or more jacks are used to lift an object at the same time, the total lifting capacity of the jack shall not be less than two parts of the load.
9. When jacking, special personnel shall be assigned to command to ensure that the jacking speed and force of each jack are basically the same
10. When jacking, special personnel shall be assigned to command to ensure that the jacking speed and force of each jack are basically the same