Fault phenomenon: The oil pressure of the hydraulic pump in the hydraulic oil station of the circulating water outlet check valve cannot be established without oil injection after minor repairs.
1), the oil filter on the suction pipe of the oil pump is blocked
2). The pressure relief valve is not closed or there is debris in the valve and the valve core is damaged.
3), leakage of oil pump suction pipeline
4) The oil pump valve disc is damaged
5), inner leakage of the cylinder
1), clean the oil filter on the suction pipe of the oil pump
2). Disassemble and check for debris or wear, and clean the valve body.
3). Remove the oil pump and move the oil pump, then check whether the suction pipe joint is inhaled. If there is, re-tighten the joint or replace it.
4). After disassembling the oil pump valve plate, overhaul and replace the “O” rings of all valve plates
5). Check the inner surface of the cylinder barrel for linear or point-shaped scratches, whether the Y-shaped seal ring is aging or damaged, and replace it if there is.
1). For overhaul, all sealing “O” rings of the hydraulic oil station should be replaced. And clean the oil filter on the suction pipe of the oil pump.
2) Strengthen technical training and improve the quality of overhaul.