How to Repair a Bifold Door Top Roller: A Comprehensive Guidesliding bifold door repair doors are a popular choice for many house owners due to their space-saving style and ease of use. However, like any other door type, they can malfunction gradually, particularly if not correctly preserved. Among the most common concerns with bifold Door Off track doors is a faulty top roller, which can trigger the door to stick, drag, or perhaps fall off its track. In this post, we will provide a step-by-step guide on how to repair a bifold door leading roller, in addition to some beneficial ideas and FAQs to help you troubleshoot and fix typical issues.Comprehending the bifold door won't fold Door Top Roller MechanismBefore we dive into the repair process, it's vital to comprehend how the bifold door upgrade door leading roller mechanism works. The top roller is a small wheel or bearing that connects to the top of the bifold door vertical adjustment door and rolls along a track or rail when the door is opened or closed.