Impeller maintenance: In the early stage of impeller operation and all regular inspections, whenever there is a chance, the impeller must be inspected for cracks, wear, dust and other defects. Whenever possible, the impeller must be kept clean, and the dust and rust on it must be regularly brushed with a wire brush, because as the operation time increases, these dusts cannot be evenly attached to the impeller, resulting in The balance of the impeller is broken, and the rotor vibrates. Impeller only be carried out repairs, we need to re-do their balancing. If possible, you can use a portable test balancer to balance on site. Before performing dynamic balancing, it is necessary to check whether all tightening bolts are tightened. Because the impeller has been operating in an unbalanced state for some time, these bolts may have been loosened.