Malfunction |
Cause |
Solution |
Oil supply of the oil pump is intermittent and there is a faint noise. |
1. Oil level is too low and air has been absorbed. |
Fill oil and increase the oil level. |
2. Suction port is blocked. |
Remove impurities from the suction inlet. |
3. Air release valve is closed, the pressure in oil storage pipe decreases. |
Open the air release valve. |
The plunger and pressure rod rebound automatically. |
1. The check valve port is slightly worn. |
Correct the valve port. |
2. The check valve spring loses its elasticity or is damaged. |
Replace the check valve spring. |
3. There are particles in the check valve port. |
Clean the check valve. |
When using hydraulic hand pump under static pressure, the pressure drops slowly. |
Failure of various seals. |
Check each seal, tighten the screws or replace the rubber ring. |
Cavitation occurs when using hydraulic hand pump. |
Insufficient exhaust. |
Press the abdomen of pump upwards several times. |