The correct way to repair PVH series hydraulic pumps

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The PVH series of hydraulic pumps is a very common type of hydraulic pump in our daily lives, and it is used in various industries. The more it is used, the more problems and failures are likely to occur. It’s not related to the quality of the product, but rather to improper usage or maintenance methods. So, how should maintenance of PVH series hydraulic pumps be carried out? 　　Common issues encountered during the maintenance of PVH series hydraulic pumps are excessive noise, insufficient oil output, and high pump temperature; let’s analyze these three problems. First: Excessive noise from PVH series hydraulic pumps
1. Blockage at the oil suction port or in the filter – Remove debris to keep the oil suction line unobstructed.
2. Poor sealing at the connection of the oil suction port, allowing air to enter – Improve the sealing and tighten the connections.
3. The oil suction port is too high and the oil level in the tank is low – Lower the height of the oil suction port and top up the tank with oil.
4. The pump and coupling are not aligned or are loose – Reinstall them so that they are aligned and tighten the connections.
5. Loose connection screws – Tighten them appropriately.
6. The viscosity of the hydraulic oil is too high, resulting in a low flow rate through the suction port filter – Replace the oil with one of appropriate viscosity and use a filter with higher flow capacity.
7. The inner surface of the stator is scratched – Polish the inner surface of the stator.
8. The inner surface of the stator’s oil suction area is worn – Reverse the stator’s orientation when installing it.
9. Some blades do not move smoothly or are installed incorrectly – Check each blade individually, reinstall them properly, and reassemble any blades that do not move smoothly.

Second: Insufficient oil output from PVH series hydraulic pumps
1. The motor is rotating in the wrong direction – Correct the rotation direction.
2. The oil level in the tank is too low – Top up the oil to the marked level.
3. Blockage in the oil suction line or filter – Clear the blockage in the oil suction line and clean the filter.
4. The motor speed is too low – Increase the speed to above the minimum required for the hydraulic pump.
5. The oil viscosity is too high – Check the quality of the oil, replace it with one of appropriate viscosity, or increase the oil temperature.
6. The end face of the oil distribution plate is worn – Repair or replace the oil distribution plate.
7. The blades do not make proper contact with the inner surface of the stator – Repair the contact surfaces or replace the blades.
8. The blades are stuck in their slots or do not move smoothly – Check each blade individually and reposition those that do not move smoothly.
9. Loose connection screws – Tighten them appropriately.

Third: Excessively high pump temperature in PVH series hydraulic pumps
1. Excessive pressure and high speed – Adjust the pressure valve and reduce the speed.
2. The oil viscosity is too high – Use oil with appropriate viscosity.
3. Poor cooling conditions in the tank – Increase the tank’s capacity or add more cooling devices.
4. Severe friction between the oil distribution plate and the rotor – Repair or replace the oil distribution plate or the rotor.
5. Severe wear on the blades and the inner surface of the stator – Repair or replace the blades and the stator, and take measures to reduce wear.

These are the common faults associated with PVH series hydraulic pumps along with the corresponding repair methods. If any of these issues occur, repairs can be carried out step by step using the correct procedures. If you are not very familiar with the structure of PVH series hydraulic pumps, you can contact professional hydraulic pump repair manufacturers and ask them to provide repair services.