How to Repair Bifold Door Top Roller Guide If your bifold door is sticking, it's likely that they require some maintenance. You may have to clean and lubricate them or adjust them. The issue could be caused by loose bolts on the top pivot, or by the top guide roller. https://bifoldingdoorrepair26998.elbloglibre.com/30447127/bi-fold-door-repairs-s-history-history-of-bi-fold-door-repairs