The reason may be due to the high temperature of the pump bearing:
1. No lubricating oil, grease or lubricating oil, grease.
2. Lubricating oil, grease use or save time is too long,
3. The lubricating oil quality is poor, does not play the role of lubrication.
4. Cleanliness of oil pool can not meet the needs of use.
5. Centrifugal pump axial force is too large. (reason for the radial force of the self sucking pump)
6. Bearing quality is not high, running the inner race or running outer ring.
7. The external conduction temperature is high and the cooling is insufficient.
8. Use or pairing is not reasonable.