Many people have seen the use of a screw jack, but there are probably not many who have actually put it into practice. Some people even buy a screw jack and keep it in the trunk for a long time. It's a good thing that the car hasn't had any problems, but we still need to learn how to use the screw jack to prevent any unexpected dangers.

1. Before lifting heavy objects, pay attention to aligning the position of the jack to keep it vertical, in order to prevent the screw from tilting or bending and accidents caused by it.

2. When lifting, the handle should be shaken evenly with force to avoid accidents and damage to the jack caused by vertical impact.

3. When using, attention should be paid not to exceed the maximum allowable top load capacity to prevent accidents caused by overload.

4. When in use, the lifting height should not exceed the marking line on the sleeve or piston. For jacks without marking lines, the lifting height should not exceed 3/4 of the total height of the screw thread or oil plug to avoid dislodging the sleeve or piston, damaging the jack and causing accidents.

5. Before loosening the jack to lower the heavy object, it is necessary to check whether the weight has been firmly supported and then slowly lowered to ensure safety.

6. During use and storage, it is necessary to lubricate with butter to prevent excessive wear and reduce the service life.

You should have a general understanding of the usage of the screw jack, and feel free to consult if you have any questions.