Fault phenomenon: The screw block of the hydraulic oil station valve block of the circulating water outlet check valve is severely leaking, causing the oil level of the fuel tank to drop and the outlet pressure of the oil pump to be low.
Cause analysis: The screw "O" ring seal is damaged.
Treatment method: First use [20 channel steel welded to the valve body to block the oil cylinder return rod, so that the valve cannot be closed after the oil station has no oil pressure, then stop the oil pump and replace with a new "O" ring.
1). For overhaul, all sealing “O” rings of the hydraulic oil station should be replaced.
2) Strengthen technical training and improve the quality of overhaul.