(1) Oil is drawn out or gas enters the suction pipe (2) System relief valve control pressure is too low (3) Hydraulic cylinder relief valve control pressure is too low (4) Gear oil pump is severely worn and insufficient pressure (5) Oil leakage from hydraulic cylinder O-ring
(1) Check suction pipeline and filter (2) Adjusting and replacing the system safety valve (3) Adjusting and replacing the hydraulic cylinder safety valve (4) Restoring or replacing the gear oil pump (5) Replacing the hydraulic cylinder O-ring