How to Repair Bifold Door Top Roller Guide If your bifold doors are sticking it's likely they need some attention. You may need to clean and lubricate them or adjust them. The issue could be caused by a loose bolt on the top pivot or by the top guide roller. https://replacebifolddoors83765.smblogsites.com/30496315/4-dirty-little-secrets-about-bi-fold-door-repairs-and-the-bi-fold-door-repairs-industry