How to master the cause of the failure of the vane pump!（2）

Lecture 3: System Dropout

System pressure drop means that the vane pump can reach the predetermined pressure when it is working, but the pressure will gradually drop, causing the system to fail to work normally. If this phenomenon occurs in the newly installed pump, it should be caused by the leakage of the control valve of the system or the oil temperature is too high. If the above problem occurs after a period of use, check whether the upper and lower oil distribution plates are worn (very flat) wear), if the gap between the upper and lower oil distribution plates is too large, the oil temperature is too high (the mucous membrane cannot form self-sealing oil), and the leakage of the control valve will cause the system to drop pressure.

Lecture 4: No pressure

No pressure means that there is no pressure in the system when the vane pump is working. First check whether the hydraulic oil is discharged from the vane pump. If not, check whether the working direction of the oil pump is correct and whether the coupling connection between the motor and the vane pump is normal. , whether the shaft positioning screw is tightened and works, whether the blade cannot work normally due to the high viscosity of the hydraulic oil; if there is hydraulic oil coming out, it proves that the pump is basically no problem, the problem should be the serious leakage of the control valve, the total pressure valve (relief valve) failure.

Lecture 5: System oil temperature is too high

The reason for the high oil temperature in the system should be that the pipes in the system are too small, the pressure is too high, and the cooling system does not meet the requirements, etc., which lead to oil trapping in the vane pump, which is reflected in the high oil temperature of the pump body and the system. Pipeline, or reduce the displacement of the pump (replace the pump core with a small displacement), adjust the cooling system to increase the cooling effect.