A common reason for garage door roller to come off track occurs when the garage door closes on an object (car bumper, trashcan, broom, bike, etc.). This can cause the cable to slip off of the drum on one side of the door. When the cable comes off the drum, the spring unwinds and releases the full weight of the door on one side, jamming the door into the track.
Garage door rollers are exposed to dirt and debris on a regular basis. As rollers move up and down the tracks, they pick up friction-causing debris that leads to roller break down. Any unnecessary friction increases stress on the cables and can cause them to slip or break. We recommend keeping your rollers clean and well lubricated and replace broken or worn down rollers.
Spring Getting Ready to Break
When a spring nears the end of its life cycle, the garage door can start to drag on the left or right. This is especially common on one spring systems on a 2-car garage door. As a spring deteriorates, the weight of the door is no longer fully supported and the door starts to become unbalanced.