Whenever possible, the impeller must be kept clean. Regularly use a wire brush to remove accumulated dust, rust, and other deposits. As operating time increases, these deposits cannot adhere uniformly to the impeller, causing imbalance and resulting in rotor vibration.

Whenever the impeller is repaired, it must be dynamically rebalanced. If conditions permit, a portable dynamic balancing instrument can be used for on-site balancing. Before dynamic balancing, check that all set screws are tightened. Since the impeller has operated in an unbalanced state for some time, these bolts may have loosened.