How do I put my garage door back on its track?

To put your garage door back on its track after it has gone off track and rollers are out of track channel, you need to realign tracks and guide rollers back safely with help, as door is heavy and can cause injury if mishandled. First, stop using automatic opener and pull red emergency release cord hanging from trolley to disconnect opener so door can be moved manually. Close door if possible; if stuck open, clamp locking pliers or C-clamps onto tracks just below rollers on both sides to prevent door from falling, as door weighs 150 to 300 pounds. Inspect why it went off track, such as hit by car, loose track bolts, worn rollers, broken cable, or broken spring; if cable or spring broken, call professional as high tension. If tracks slightly bent and cables intact, loosen vertical track mounting bolts slightly with wrench, enough to pry track open gently with flat bar to create space for roller. With another person helping, lift door evenly, keep it level, and guide slipped rollers back into track channel, starting from bottom and working up, ensuring roller stems seat into hinges. Once all rollers inside, tighten track bolts securely, check that tracks are plumb, parallel, and spaced about half inch from door edge, and horizontal tracks level. Lubricate rollers with silicone spray, manually lift door halfway to test balance, then reconnect opener by pulling cord toward door and running opener until trolley clicks onto carriage. Professional re-track costs 125 to 400 dollars if needed.