A snapped or off-drum cable usually comes from wear and rust, a broken spring that damages the cable, or a cable rubbing on a worn drum. The door hangs crooked or will not lift. Stop using it, keep clear, and call a technician. Both cables are usually replaced, because the second has the same wear.
What the cables do
Garage door lift cables run from the bottom corners of the door up to the drums at each end of the spring shaft. The spring supplies the lifting power, and the cables carry it to the door. When one cable fails, that side of the door loses its support and can hang crooked.
Each cable carries the door's weight on one side. That is why a failed cable is an urgent repair, not a cosmetic one.
Why a cable snaps or comes off the drum
Raynor lists several causes. Some are slow, like wear and rust. Others happen all at once.
- Normal wear and corrosion, which moisture speeds up
- A broken spring, whose sudden release of energy often damages the cable
- Rubbing against a worn drum or pulley when the cable sits out of position
- Uneven tension left behind by an earlier repair
- Damp conditions that keep the metal wet and rusting
A cable that sits out of position on the drum rubs as the door moves, which wears it faster. Using a door that already has a damaged cable makes the damage worse.
What a snapped cable looks like
The door hangs lower on one side. A cable dangles along the door or lies on the floor. You may see frayed strands near the drum or the bottom bracket, hear one side scraping, or find the door has slipped out of the track on that side. If the cable breaks while the door is open, that side of the door can drop.
What a loud snap means
A loud bang from the garage can be a cable or a spring. A broken spring is a common source of that sound, and it often damages a cable at the same moment, so the two are frequently replaced together. Look for a gap in the spring coil as well as the cable. See signs of a broken spring.
Quick answers
Garage door cable snapped: how do I open the door?
Do not force it. A door with a failed cable can hang crooked or drop on one side, so leave it as it is and call a technician.
What does a loud snap when the garage door moves mean?
It can be a cable or a spring. A spring break often damages a cable at the same moment, so a technician checks both.
Should both garage door cables be replaced at the same time?
Usually yes, because the second cable has the same age and wear. Replacing both keeps the door balanced.
Why did the cable come off my garage door drum?
Common reasons are wear, a broken spring, a worn drum or a cable that sits out of position. A technician finds the cause.
What to do right now
Stop using the door and disconnect the opener, but only if the door is fully closed. Keep everyone clear, and never stand or walk under the door. Call a technician promptly, because each use can make the damage worse.
Cable replacement is not a do-it-yourself job. The cables connect straight to spring tension, and DASMA says frayed or worn cables should be replaced only by a trained technician.
If the door is stuck open or partly open, do not try to force it down or up. A technician can secure it first.
Should both cables be replaced?
Usually yes. The second cable is the same age and has done the same work. Replacing both keeps the door balanced and helps avoid a second call soon after. The technician will also check the springs, drums and brackets, because they wear on the same schedule.
Our typical price for a lift cable pair is $175 to $350, and cables with new drums are $250 to $450. We confirm the final price after we see the door. See garage door cable repair.
Get the door looked at
Emil Garage Doors repairs cables, springs and doors across Southern California, for example in Alhambra and Anaheim, and our city pages also cover Chico. Call (213) 340-4232 or use the estimate form, and tell us what the cable and the door look like.
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