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What to do when a garage door cable breaks
Short answer
A frayed, slipped or snapped garage door cable leaves one side of the door without support, so the door hangs crooked and can fall out of its track; HomeGuide puts cable repair at about $150 to $350. Unplug the opener, keep clear of the door and call. Cables are replaced in pairs so both sides lift evenly.
Warning signs
Signs a lift cable is failing
Frayed strands near the bottom bracket
Cables fray where they meet the bottom corners of the door.
The door sits crooked when closed
One cable has stretched, slipped or snapped.
Slack cable at the drum
The cable has come off its drum or lost tension.
A loud snap, then a crooked door
A cable has broken under load.
Rust on the cables
Moisture and salt weaken the steel strands.
The job
How lift cables work
On a torsion system, a cable runs from each bottom corner of the door up to a drum at each end of the spring shaft. As the springs unwind, the drums turn and wind the cables, lifting both sides of the door together. On extension-spring doors, the cables run over pulleys instead.
Cables fail at the bottom bracket, where moisture and salt collect, or at the drum, where a cable can jump its groove. Either way, both sides need to match. A new cable beside an old stretched one lifts the door unevenly, so we replace them in pairs and wind them evenly on the drums.
Frayed lift cable
Replacing a frayed lift cable
Fraying usually starts at the bottom bracket, where the cable loops onto the door. Once strands are broken, the cable is weakening every cycle. We replace both cables with the door secured and the spring tension controlled, then check the bottom brackets, which can corrode in the same spot.
Cable off the drum
When a cable comes off the drum
A cable can jump off its drum when the door hits an obstruction, when a spring breaks, or when the door is pulled down by hand with slack in the cable. The door drops on that side and may leave the track. We secure the door, re-seat or replace the cable, and wind both drums evenly so the door sits level.
Snapped cable
Snapped cables
A snapped cable usually means it was frayed for some time. The door can drop or twist, so treat it as an emergency if the door is open. The repair is new cables in pairs, a check of the drums and bottom brackets, and a balance test, since a snapped cable often goes with a tired spring; see torsion spring replacement.
How the visit runs
How a cable replacement runs
- 1
Secure the door
Clamped so the cables carry no load.
- 2
Control the tension
Spring tension released where the repair needs it.
- 3
Replace both cables
New cables, bottom brackets checked.
- 4
Wind the drums evenly
Both sides set so the door sits level.
- 5
Balance and test
Halfway test, opener reset, safety reverse.
Around Naperville
Cables on older Naperville doors
In Maplebrook, whose Maplebrook II section went up in the early 1970s, and in the original part of Saybrook, first built in the 1960s east of Washington Street off 12th Avenue, many garage doors have been replaced over the years but still hang on hardware that has seen decades of winters. Salt and meltwater collect at the bottom brackets, which is exactly where lift cables start to fray, so we check both brackets on every cable call.
Do it yourself or call
What is safe to check
Cables are under spring tension whenever the door is closed.
Fine to do yourself
- Look for frayed strands at the bottom corners from a distance
- Keep the door closed and the opener unplugged after a break
- Keep salt and slush cleared from the bottom brackets
- Note which side dropped for the call
Leave to a technician
- Removing or installing cables on a loaded door
- Bottom brackets, which hold cable tension
- Winding cables on the drums evenly
- Releasing or setting spring tension
Cost
What a cable replacement costs
HomeGuide puts garage door cable repair or replacement at about this range. It is a planning figure, not our quote.
- Both cables replaced as a pair
- Drums or bottom brackets worn
- Door off its track as a result
- Spring condition
- An overnight or holiday call
Answers
Questions about garage door cable replacement
No. A fraying cable can snap under load and drop one side of the door. Stop using it and call.
Yes. They work as a pair, and a new cable beside a stretched one lifts the door unevenly.
Usually an obstruction, a broken spring, or slack in the cable from pulling the door down by hand.
If the door is open or hanging crooked, yes. If it is closed and stable, it can wait for a scheduled visit.
Often together. A tired spring and frayed cables are checked on the same visit.
Same group
Related door work we handle
Emergency Garage Door Repair
A door stuck open at night or a car trapped inside, answered around the clock.
Garage Door Repair
Diagnosis for a door that still runs but reverses, stalls or grinds.
Garage Door Off-Track Repair
Rollers out of the track and doors hanging crooked, reset and squared.
Garage Door Panel Replacement
One damaged section swapped instead of the whole door, when the part still exists.