What is the reason for excessive noise (buzzing/rubbing) during operation?

Fault phenomenon: Abnormal noise is emitted during the operation of the equipment, affecting the workshop environment and partially accompanied by heating of the pump body.

Core reason: Air inside the pump causes cavitation; Wear of water pump impeller or damage of bearings; Loose pipelines cause vibration; The equipment installation is not smooth.

Solution: Open the exhaust valve to expel the air from the system; Check the impeller and bearings of the water pump, and replace them if they are severely worn; Fix loose pipelines and install shock absorbers; Adjust the installation position of the equipment to ensure a stable placement.