How to get a roller door back on track?

To get a roller door back on track, whether it is a sectional garage door with rollers or a commercial roller shutter, you need to safely realign the rollers into the vertical and horizontal tracks without forcing the door, because forcing can bend tracks and damage rollers. First, stop using the automatic opener and pull the red emergency release cord to disconnect the trolley so you can move the door manually. Close the door if possible, or if it is stuck open, securely clamp locking pliers onto the tracks just below the rollers to prevent it from falling, as roller doors are heavy and can slam down. Inspect why it came off track, such as hitting the door with a car, loose track bolts, worn rollers, or broken cables causing imbalance. Loosen the track mounting bolts slightly with a wrench, not removing them fully, so you can gently pry the track open just enough to guide the rollers back into the track channel. With help, lift the door evenly and guide each roller back into the track, starting from the bottom. Once all rollers are inside, tighten track bolts, ensure tracks are plumb and spaced correctly about one half inch from door edge. Lubricate rollers with silicone lubricant, test balance manually by lifting halfway, and reconnect opener. If tracks are severely bent or cables broken, call a professional for repair costing 150 to 400 dollars, as tracks are under spring tension influence.