How to Repair Bifold Door Top Roller Guide If your bifold door is sticking then it's likely that they require some maintenance. You may need to clean, lubricate or adjust them. The issue could be caused by a loose bolt at the top pivot or by the top guide roller. https://bi-fold-door-repair85586.blogars.com/29706586/the-most-underrated-companies-to-watch-in-the-bi-fold-door-repairs-industry