​Maintenance of Sewage Pumps

I. Inspection and Maintenance of Sewage Pumps

ZW sewage pumps and WQ sewage pumps offer excellent performance and reliable operation. Each pump undergoes strict factory testing before shipment. However, to guarantee the service life of the sewage pump, it is recommended that users perform regular inspections and maintenance.

Regularly check the insulation resistance between phases and between each phase and ground of the pump motor. The value should be greater than MΩ. Otherwise, disassemble and service the motor (perform drying treatment). Also, check whether the grounding is secure.

The clearance between the impeller and the cutting mechanism (base cover plate) is 1 mm. After prolonged use in media, this clearance may increase due to wear and should be adjusted accordingly. Method: Disconnect the power, loosen the fixing screws, and rotate the cover plate by an appropriate angle to restore the original clearance.

After multiple uses, the sewage pump must be operated in clean water for several minutes to prevent deposits from remaining in the pump cavity, which could affect normal operation.

After using the sewage pump in the specified media for half a year, inspect the condition of the oil chamber seal. Replace the mechanical seal if necessary. Pumps used under harsh working conditions require more frequent servicing. Oil change method: Position the pump so the oil chamber plug faces downward. Drain the lubricating oil, clean the oil chamber with flushing oil, refill with the appropriate amount of oil replace the O-ring, and tighten the plug.

If water is found in the used oil, clean the oil chamber as specified and refill with fresh oil. Re-check after three weeks of operation. If the lubricating oil turns into an emulsion again, inspect the mechanical seal and replace it if necessary (Please contact our service department). If conditions permit on-site replacement, perform an air tightness test after replacing the seal.

II. Sewage Pump Fault Causes and Troubleshooting Methods

Analysis of causes for reduced pump flow or head:

1. Pump is running in reverse.

2. Delivery head is too high.

3. Suction medium is bypassing.

4. Leakage in the discharge pipe.

5. Partial blockage of the discharge pipe by sediment.

6. Partial blockage of the pump.

7. Wear of the impeller or base.

Troubleshooting methods:

1. Turn off the main power at the control panel and swap two of the phase power wires.

2. Check: Is the pump selection correct? Is the discharge pipe size correct?

3. Check if any valve is closed shut, then test the pump at full load.

4. Locate the leak point and repair it.

5. Inspect the pipeline, clean it, or replace the affected section.

6. Inspect and clean the pump (including any strainers used).

7. Adjust the clearance or replace the parts.