Precautions for using hollow jack / through heart jack:
1. If the no-load phenomenon occurs during use, you can first loosen the oil discharge screw on the pump body, hold the pump vertically with its head down and make several no-load strokes, then tighten the oil discharge screw, and continue to use it.
2. During use, do not apply eccentric load or overload to avoid damaging the jack and causing danger. When under load, never remove the quick connector to avoid accidents and damage to components.