Check the self-priming pump's piping and joints for any looseness. Manually rotate the pump or use a tool to ensure it turns smoothly. Proper maintenance of a self-priming pump is essential for its performance and longevity. Here are some key maintenance steps:
(1) Inspect the pump’s pipeline and connections for tightness. Rotate the pump manually or with a tool to confirm that it moves freely without resistance.
(2) Ensure the flow rate and head of the pump stay within the recommended range indicated on the label. Operating at the optimal efficiency point helps save energy and improves performance.
(3) Monitor the bearing temperature during operation. It should not exceed 35°C above ambient temperature, and the maximum temperature should not go beyond 80°C.
(4) If you hear unusual noises from the pump, stop it immediately and investigate the cause to prevent further damage.
(5) When shutting down the sewage pump, close the gate valve and pressure gauge first before turning off the motor.
(6) If the self-priming sewage pump will be unused for an extended period, especially in cold winter conditions, drain the medium from the pump body to avoid freezing and cracking. If the pump handled sewage, rinse the chamber thoroughly with clean water.
(7) Pay attention to any abnormal sounds from the motor. In a noisy environment, use tools like a screwdriver or a stick to touch the motor housing. This can help detect vibrations, misalignment, or lack of lubrication. You can also determine if the bearings need oiling or replacement to avoid dry grinding and potential motor failure.
**Causes and Solutions for Insufficient Head Lift in Self-Priming Pumps**
1. If the pump is handling corrosive liquids and the impeller is severely corroded, replace it with a new one to restore performance. Ensure the pump meets the design requirements.
2. A large clearance between the semi-open impeller and the pump cover may reduce efficiency. Adjust or reduce the clearance accordingly.
3. Serious leakage from the mechanical seal can occur due to insufficient spring pressure, worn or damaged dynamic/static rings, loose fixing screws, or improper installation of the seal ring. Replace or repair the faulty components as needed.
4. Impurities or crystallization in the medium can affect the movement of the sealing faces. Clean all sealing parts thoroughly.
**Causes and Solutions for Overheating of Self-Priming Pump Motors**
1. Exceeding the designed flow or head can lead to overheating. Choose a motor that matches the pump’s specifications.
2. If the specific gravity of the medium exceeds the motor’s capacity, consider using a more powerful motor.
3. Over-tight packing glands or mechanical seals can increase friction. Adjust the spring compression to the correct level.
4. Poor assembly of the pump or misalignment between the motor and pump shaft can cause excessive heat. Recheck and reassemble the components properly.
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Source: China Hardware Business Network – [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Editor: Hardware Business Network Information Center
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