First, when it comes to the inspection and maintenance of sewage pumps—such as AS, AV, and WQ series—it's essential to ensure that each unit is in optimal condition. These pumps are known for their excellent performance, stable operation, and long-lasting durability, thanks to features like permanently lubricated ball bearings and high-quality mechanical seals. However, even the best pumps require regular care to maintain their efficiency and lifespan. Here are some key maintenance tips:
1. Regularly check the motor’s phase and insulation resistance. The value should be above 2MΩ. If not, disassemble and dry the motor. Also, make sure the grounding is secure.
2. Inspect the gap between the impeller and the cutting mechanism (base cover). The ideal gap is 0.3–0.5 mm. Over time, this may increase due to wear. To adjust, turn off the power, loosen the set screw, and rotate the cover slightly to restore the original clearance.
3. After repeated use, run the pump in clean water for a few minutes to prevent sediment buildup inside the chamber, which can affect performance.
4. Every six months, check the oil chamber seal and replace the oil with 10–30# machine oil if needed. If the oil appears milky or emulsified, clean the oil chamber thoroughly and replace the O-ring. In harsh environments, more frequent maintenance is recommended. Always perform an airtight test at 0.5 kg/cm² before reusing the pump.
5. If the pump fails and you're unable to identify the cause, avoid making temporary fixes. Instead, contact our technical support team for professional assistance. Improper repairs can lead to further damage and safety risks.
Second, common causes of sewage pump failure and troubleshooting steps:
1. Reduced flow or head: This could be due to reversed rotation, excessive lift, bypassed medium, pipe leaks, blockage, partial clogging, or worn impellers. Solutions include reversing the power supply, checking pipe size, inspecting valves, cleaning the system, and replacing damaged parts.
2. Pump does not operate: Possible reasons include air lock, faulty valve, or reversed rotation. Try opening and closing the valve repeatedly, ensuring correct installation, or swapping the power lines.
3. Frequent cycling: Often caused by a short float switch setting or a faulty check valve. Adjust the float switch or repair the valve to reduce unnecessary starts.
4. Pump won’t stop: This might be due to a malfunctioning float switch or a stuck float. Check and replace the float switch if necessary, and ensure the float moves freely.
5. Circuit breaker trips: This could be caused by low or high voltage, incorrect wiring, or debris in the pump. Ensure proper voltage levels, check the wiring, and clean the pump and tank if needed.
6. Pump won’t start, fuse blown, or circuit breaker trips: Issues may stem from a faulty float switch, short circuits, or a jammed pump. Test the float switch, check for electrical faults, and clear any obstructions.
7. Pump fails to start: Verify that there is power, and check for open circuits in the cable, motor connectors, or control box. Ensure all connections are secure and functioning properly.
Regular maintenance and timely troubleshooting are crucial for the smooth and safe operation of your sewage pump. Always follow manufacturer guidelines and seek professional help when needed.
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