Causes of excessive settlement of hydraulic cylinder of excavator

Generally, if there is no gap outside, the hydraulic cylinder will drift too fast, which means there is leakage in the load oil circuit. The most intuitive way to judge the leakproofness of hydraulic oil cylinder of excavator is to conduct plugging test. But we must pay attention to safety. This article will summarize the causes of excessive hydraulic cylinder drift.
1. The oil cylinder leaks internally.
2. There is internal leakage at the valve hole and valve rod of the control valve.
3. The overload overflow valve is poor.
4. The valve rod is not in the middle position.
5. The PPC valve is not in the middle position.