1) Have you noticed some vibrations coming from your mixer?
2) Have you recently rebuilt your mixer?
If so, shaft straightness should be checked. Shaft straightening is an important part of maintaining your mixer. Having a straight shaft will help increase the life of other critical components of the mixer, such as bearings.
Shaft straightness should be checked periodically and after each time your mixer is rebuilt.
Please refer to the shaft straightening section in the manual provided with the mixer. If you need assistance or additional details please do not hesitate to contact the Customer Service department at 800-466-2369.