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The use of Parker piston pumps in machines relies on proper maintenance of them; if they are used for an extended period without any maintenance, various problems will gradually arise in these pumps. Different types of malfunctions occur in different locations; therefore, it is necessary for us to be familiar with the common faults of Parker piston pumps and the corresponding solutions. The following are some issues identified by Autos: The flow rate of the Parker plunger pump (hydraulic pump) is insufficient and does not reach the specified value. 1. The rotation speed is not at the rated level – select an electric motor with a speed that matches the rated speed specified in the manual. 2. There is a leak in the system—inspect the system and repair the leak. 3. Due to the long-term operation of the Parker plunger pump and the vibrations, the screws securing the pump cover become loose—tighten the screws appropriately. 4. Air leakage in the intake pipeline — Check all connections and seal or tighten them as necessary. 5. Insufficient oil absorption: ① The oil level in the tank is too low—top up the oil to above the minimum mark; ② The inlet filter is clogged or has insufficient flow capacity—clean the filter or use one with a flow capacity at least twice that of the Parker piston pump; ③ The suction pipe is clogged or has a small diameter—clean the pipe and use a suction pipe with a diameter no smaller than that of the Parker piston pump’s inlet; ④ The oil viscosity is too high or too low—use oil with the recommended viscosity. 6. Improper flow regulation of the variable pump — Regulate it to the desired flow rate. The pressure of the Parker plunger pump (hydraulic pump) will not increase. 1. The Parker plunger pump does not supply oil or has insufficient flow rate—use the same troubleshooting methods as mentioned earlier. 2. The pressure set by the relief valve is too low or the valve is faulty—readjust the pressure of the relief valve or repair it. 3. There is a leak in the system—inspect the system and repair the leak. 4. The vibration caused by the prolonged operation of the Parker plunger pump leads to the loosening of the pump cover screws – tighten the screws appropriately. 5. Air leakage in the suction pipeline – check all connections and seal or tighten them as necessary. 6. Insufficient oil absorption—use the same troubleshooting methods as mentioned earlier. 7. Improper pressure adjustment of the variable piston pump – readjust it to the desired level. The Parker piston pump cannot draw in oil or there is no pressure. 1. The rotation direction of the prime mover and the Parker piston pump does not match – correct the rotation direction of the prime mover. 2. The drive key of the Parker plunger pump has fallen off — reinstall the drive key. 3. Oil inlet and outlet connected reversely—select the correct connection method as per the instructions. 4. The oil level in the tank is too low, with the suction pipe opening above the liquid surface — top up the oil to above the minimum level mark. 5. Low rotation speed results in insufficient suction—increase the rotation speed to above the minimum speed of the Parker piston pump. 6. Excessively high oil viscosity makes the blade movement inflexible—use working oil with the recommended viscosity. 7. The oil temperature is too low, causing the oil viscosity to be too high—heat it to the recommended normal operating temperature. 8. Poor oil suction caused by a clogged intake pipe or filter device—clean the pipe or filter device to remove the blockage, and replace or filter the oil in the tank. 9. Excessive filtration precision of the suction inlet filter leads to poor oil suction—select the filter properly according to the instructions. 10. The low filtration accuracy of the system oil causes the blades to get stuck in the grooves—disassemble and clean, grind the internal components of the Parker piston pump, reinstall them carefully, and replace the oil.