How doors come off track
- Broken spring on one side: the door lifts unevenly and jumps the rollers.
- Frayed or snapped cable: cables keep the door level as it moves; when one fails, the door tilts and derails.
- Impact: a vehicle clipping the door is the most common cause of bent tracks and derailment.
- Worn or broken rollers: rollers that seize or break let the door wander off the track.
- Bent track: even a small bend from an impact can guide rollers out of alignment over time.
Why cables matter
Lift cables work with the springs to raise and lower the door evenly. They fray gradually from rubbing against drums and brackets — visible fraying, rust, or slack are warning signs. A snapped cable under load is dangerous, and running the door on one cable destroys the balance of the whole system. Cables should only be replaced by a professional working with the springs de-tensioned.
What the repair involves
The technician secures the door so it cannot fall, assesses track, roller, cable, and spring damage, then reseats or replaces rollers, straightens or replaces bent track sections, installs new cables matched to the door, re-tensions the system, and tests the door through full cycles plus the safety reversal. If a broken spring caused the derailment, spring replacement is done at the same time.
What NOT to do
- Don't run the opener — it will grind the door further out of alignment or burn out the motor.
- Don't try to lift a derailed door manually — without spring assistance it can weigh hundreds of pounds.
- Don't "just bend the track back" — misaligned tracks cause repeat derailments and accelerated wear.
Related services
Preventing the next derailment
After an off-track repair, ask the technician what caused it — the fix should address the root cause, not just reseat the rollers. Worn rollers can be upgraded to quieter nylon-coated versions, aging cables replaced before they snap, and bent track sections replaced rather than straightened. An annual tune-up catches the wear that leads to derailments: fraying cables, seizing rollers, and loosening hardware. And if a vehicle clipped the door, have the tracks checked even when the door still works — small bends become big problems with every cycle.