What causes a garage door to come off track?
A garage door usually comes off track because something hit the track in a narrow garage, a lift cable snapped or slipped off its drum, rollers wore out from heavy use, or track brackets worked loose. Stop using the door and call for a safe reset.
A garage door that has left its track looks wrong right away. One corner hangs low, a roller pokes out of the rail, or the door sits twisted in the opening. In Fairfax we see a handful of causes over and over.
Safety comes first
A door off track is under uneven strain, and the springs above it are still loaded. Do not run the opener. Do not try to pull the door back into place. Keep everyone clear and call (571) 736-2137.
Cause one: a bump in a narrow garage
Townhouse garages in and around Fairfax are often narrow. There is not much space between a car and the track, and side mirrors, bumpers and bikes knock the lower track out of line. A small bend can pinch a roller, and the next time the door moves, the roller pops out.
Cause two: a cable lets go
The lift cables carry the weight of the door from the bottom corners. Summer humidity rusts them where they meet the bottom bracket, and rusted cable frays. When one breaks, or slips off its drum, that side of the door falls. The tilt can pull rollers out of the track on the way down.
Cause three: worn rollers on a busy door
When a townhouse garage is the main entrance, the door can make many trips a day. Rollers wear faster on those doors. Once the bearings stop turning, the roller drags instead of rolling, and a dragging roller is much more likely to leave the track.
Cause four: loose track hardware
The bolts and brackets that hold the track to the wall loosen with vibration over time. If the track spreads away from the door even a little, the rollers have room to slip out.
Cause five: closing on something
If the door comes down on a trash bin or a bike and the opener's force setting is too high, the door can be pushed sideways out of line before it reverses.
How it gets fixed
The technician releases tension safely, sets the door back into the tracks, and straightens or replaces any bent track. Frayed cables are replaced, both cables are wound evenly, worn rollers are swapped, and loose brackets are tightened. The opener's force and travel are reset, and the safety reverse is tested.
For costs, this site's price table shows $120 to $200 to rehang a door in its tracks, $150 to $290 for cable or drum work, and $210 to $340 to swap a bent piece of track.
Keeping it on track
Leave space around the tracks, especially in a narrow garage. Watch for frayed cable strands and rollers that wobble. If you hear new scraping or popping, call early.
We can help with garage door cable & track repair and garage door repair in Fairfax. You might also like Why Springs Snap on Cold Fairfax Mornings.
Reference: the CPSC's garage-door safety notes (manufacturer / safety source).