1. Overload, reduce the load to eliminate;
2. The oil return valve is not closed, it can be eliminated by tightening the oil return valve;
3. The one-way valve of the manual pump is stuck and the return fails;
4. Unscrew the bolt of the oil pump valve port, repair, clean, and replace the clean hydraulic oil to remove it;
5. The manual pump and gear pump have serious oil leakage, which can be eliminated by replacing the oil pump sealing ring;
6. If the gear pump is damaged, the oil is pressureless, and it can be eliminated by replacing the gear pump;
7. If the hydraulic oil is insufficient, add enough hydraulic oil to eliminate it;
8. If the circuit is broken, check the button contactor and fuse to eliminate it;
9. The filter is clogged, it can be eliminated by replacing or cleaning.
