Today, Shanghai Shenyin Pump—a supplier of submersible sewage pumps—guides you on how to inspect and maintain these pumps:
This series of submersible sewage pumps offers excellent performance and reliable operation. Each unit undergoes rigorous factory testing; features such as permanently lubricated ball bearings and high-quality mechanical seals operating within an oil chamber ensure exceptional durability. However, to maximize the pump's service life, regular inspection and maintenance are recommended.
1. Periodically check the insulation resistance of the motor (phase-to-phase and phase-to-ground); the value should exceed 2 MΩ. If it falls below this, the pump must be disassembled for repair (including a drying process), and the grounding connection should be verified for security.
2. The clearance between the impeller and the shredding mechanism (base cover plate) is set at 0.3–0.5 mm. After prolonged use in the medium, this gap may widen due to wear and should be readjusted. The adjustment method is as follows: disconnect the power supply, loosen the fixing screws, rotate the cover plate to the appropriate angle to restore the original clearance, and retighten.
3. After repeated use, the pump should be run in clean water for several minutes to prevent the accumulation of deposits and ensure the unit remains clean.
4. After six months of normal operation in the specified medium, inspect the oil chamber seal, replace the oil (using No. 10–30 grade machine oil), and replace the mechanical seal if necessary. Pumps operating under harsh conditions require more frequent maintenance. The oil change procedure is as follows: position the pump so the oil chamber plug (located on the inner side of the discharge outlet) faces downward to drain the lubricant; flush the oil chamber with cleaning oil; refill with the appropriate amount of oil (approximately 70%–80% capacity); install a new O-ring; and securely tighten the plug. If water (appearing as a milky emulsion) is found in the oil chamber of the submersible sewage pump, flush the chamber and refill with fresh oil according to specifications. Re-inspect the oil after three weeks; if it has turned into an emulsion again, the mechanical seal must be checked and replaced if necessary (please contact our maintenance department). If you choose to replace the seal yourself, an airtightness test (using an air pressure of 0.5 kg/cm²) is mandatory. In the event of a malfunction where the cause cannot be determined—or if the troubleshooting methods provided later fail to resolve the issue—do not attempt makeshift repairs or unauthorized disassembly; instead, contact our maintenance department.
A submersible sewage pump supplier explains how to inspect and maintain these pumps.