Response to Hi, John. A loud whine indicates that the motor bearings are failing. Replacing the seals will not resolve this matter, the motor will need to be replaced. Your options are the B2853 or PL2853. The seals are all listed on the Pentair / Pac Fab Challenger CH / CF Series Parts Diagram page.  

An image is worth 1,000 words! Add an image or two to your comment to help ensure it is understood accurately.

Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.