Special attention should be paid when using a jack. In addition to avoiding overloading, excessive height is also not allowed because the jack is prone to tipping over due to changes in the center of gravity during the lifting process. Additionally, if the jack malfunctions and the sleeve cannot return smoothly, how can we prevent excessive height?

As is well known, the nameplate of a jack clearly indicates the maximum lifting height of the jack. However, this information is not the same as the maximum load. We can calculate whether there is overload by understanding the weight of the car, because the lifting height is targeted at the chassis of the car, not the height of the vehicle. Therefore, we cannot measure with a ruler while pressing the handle.

In fact, the jack has an ultra-high limit mark, which means that during the process of continuously pressing the handle to lift the plunger, when a red line appears around the plunger, it means that the rated height has been reached and the lifting needs to be stopped immediately. Continuing to lift will only cause the jack plunger to malfunction and cannot return.

This is the way to prevent the jack from exceeding its height during use. Finally, Crown Airlines kindly reminds everyone to always pay attention to the limit red line when pressing the jack handle to prevent accidental failures.