Fault phenomenon: The oil pressure is low during the start-stop process of the low-pressure bypass valve. The bypass valve cannot open and close properly.
1). The low side oil pump is broken.
2), the oil bypass proportional valve of the low bypass valve is blocked
3). The pressure relief valve of the distribution plate of the low-pressure bypass oil station is not closed tightly.
1). Observe the pump outlet pressure gauge to see if the pressure has changed after starting the pump. If there is no change, confirm that the oil pump is damaged. After the pump is disassembled, check the oil pump gear clearance and the pump shaft health and groove.
2), clean the low-pressure bypass valve oil proportional valve.
3), clean the valve core and valve seat of the pressure relief valve of the low-pressure bypass oil station.
1) Strengthen technical training and improve the quality of overhaul.
2) Strengthen patrol inspection, check carefully, find problems in time and deal with them.