when do i need roller replacement?

A handy person from Olathe Kansas says:
January 11, 2018
What is a good indicator that I need to replace the rollers on a series 400 fw patio door? installed approx 2008. door seems to slide OK, not great but really don't remember what great is, but seems worse the colder it gets. Thanks
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Paul from SWISCO responded:
January 22, 2018
When the bearings wear out, you will feel the door slide like it is going over dents and valleys, and you may even hear a scraping sound. Examine the track for metal filings. Don't wait too long, or you will not only need to change rollers, but also the track.
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