The main reason for the decline is usually due to leakage, so the first step is to diagnose the cause and fault point of the leakage and deal with it. You can try to check:
1. Is there any leakage in the lower chamber balance valve or back pressure valve of the oil cylinder.
2. Is there any damage to the axial seal of the oil cylinder.
3. Is there any oil leakage phenomenon in the oil cylinder (damaged piston seal), etc.
汽车内饰液压机活塞杆下滑怎么办？