Can I use the door if one cable is broken?

No. With one cable gone, the whole door is hanging from the other side. It will bind in the tracks and can come down unevenly. Leave it where it is.

How long do garage door cables last?

In a dry garage, often as long as two or three sets of springs. In a garage that sees a lot of salt and slush, they can need attention much sooner. Condition matters more than age.

Why did my cable come off the drum?

The usual reasons are a broken spring, the door hitting something on the way down, or a worn drum. We find which before we put it back.

Do you replace cables when you replace springs?

We inspect them every time. If they show rust or broken strands, replacing them while the springs are already unwound saves you a second visit.

Is a frayed cable an emergency?

It’s not a today-or-else problem if the door is closed and you leave it closed. It is a stop-using-the-door problem. Frayed cable can let go without further warning.

Garage Door Cable Repair in Franklin, WI

Where the cables are and what they do

Stand inside your garage with the door closed and look at the bottom corners. On each side, a steel cable is looped onto a bracket at the lowest section. Follow it upward and it disappears behind the track, then wraps around a grooved aluminum drum at the end of the spring shaft.

That’s the whole system. The springs turn the shaft, the drums wind up the cables, and the cables pull the door up by its bottom corners. Both sides have to wind at exactly the same rate. If one cable is slack by even half an inch, that corner of the door lags behind, and the door racks in the opening.

On doors with extension springs the layout is a little different. The cable runs from the bottom bracket up over a pulley, back to a second pulley on the end of the spring, and then to an anchor point on the track hanger. Same idea, more places to wear.

How cable problems show up

Cable trouble rarely looks subtle. Here’s what people describe when they call.

One side of the door is higher than the other, with a wedge-shaped gap at the floor
The door stops partway and won’t go up or down
A loop of cable is hanging down beside the track
Cable is bunched up or crossed over itself on the drum
You can see broken wire strands sticking out like whiskers near the bottom of the door
The door came down with a crash and one cable is lying on the floor

If any of these sound familiar, stop using the opener. Running the motor against a jammed, crooked door is how sections get creased and tracks get bent.

Why cables fail

Rust at the bottom

This is the big one in our part of Wisconsin. The last foot of cable sits a few inches above the floor, right where slush, salt, and meltwater collect all winter. Galvanized cable resists corrosion for years, but the coating eventually gives up and the strands start breaking one at a time from the inside out. By the time you can see fraying, the cable has lost a good share of its strength.

A broken spring

When a torsion spring breaks with the door moving, the shaft stops pulling and the cables go slack. They often jump out of the drum grooves. In that case the cable itself may be fine, but it still needs to come off, be inspected, and be re-hung correctly once the new springs are in.

Something in the door’s way

A door that comes down on a trash can, a bumper, or a snow shovel stops on one side while the other keeps moving. The cable on the blocked side unspools and tangles. This is also why a working safety reverse on the opener matters.

Worn drums and pulleys

Drums are cast aluminum. After enough years the grooves wear, or the casting cracks near the set screws, and the cable no longer tracks cleanly. On extension systems, a pulley with a failed bearing will chew through a cable quickly.

Wrong cable for the door

Cables come in different diameters and lengths for different door heights and weights. A cable that’s slightly too long leaves slack at the top of travel. Too thin, and it wears out early. We see both on doors that were worked on in a hurry.

Close-up of wound steel wire rope showing the individual strands — Reference photo: close-up of wound steel wire rope showing the individual strands.

What a proper cable repair includes

Swapping the cable is the easy part. Doing it safely and making sure it doesn’t happen again takes a few more steps.

Lock the door in place. We clamp the tracks and, if the door is stuck partway, support it so nothing can drop.
Take the tension off. The springs have to be unwound before the cables can be removed. There’s no safe shortcut around this.
Find the cause. We look at the drums, bearings, bottom brackets, pulleys, and the track before fitting anything new. Otherwise the new cable inherits the old problem.
Fit new cables on both sides. Matched length, correct diameter for the door, seated in the bottom bracket and the drum.
Level and tension. With the door flat on the floor, both cables are snugged evenly, then the springs are wound and the door is balance-tested.
Run it. Several full cycles by hand and with the opener, watching how the cable lays into the drum grooves each time.

We replace cables in pairs for the same reason we do springs. They’ve lived the same life, and a new cable beside a stretched old one makes it harder to keep the door level.

Rusted, tangled cable and cable wound correctly on its drum

On the before side, you can see steel cable that has spent too long in the damp: rust through the galvanizing, kinks, and a tangle that no drum could wind cleanly. Cable in this condition can look serviceable from a few feet away while carrying only part of its rated load.

On the after side, there is cable laid neatly into the grooves of a drum on the door shaft, each wrap sitting beside the last. In a real repair the new cables go on both sides, the bottom brackets are checked or replaced, and the door is leveled on the floor before the springs are wound. The benefit is simple. The door rises square in its opening and both corners share the load.

Parts we often replace alongside the cables

Bottom brackets. If the cable rusted, the bracket it was hooked to usually did too. A corroded bracket can tear free of the door’s bottom rail, so we replace any that look thin.

Bottom rollers. They ride in the same wet zone. A seized bottom roller drags, and that drag shows up as uneven cable tension.

Drums. Cracked or grooved drums get replaced as a pair.

Safety cables. On extension spring doors we add or replace the cable that runs through each spring. It’s a separate part with a separate job, and every extension spring should have one.

Keeping cables healthy through a Wisconsin winter

You can’t keep salt out of a garage in February, but you can limit what it does.

Sweep or squeegee standing water away from the door corners. Once or twice during the season, wipe the lower couple of feet of cable and the bottom brackets with a dry rag. Resist the urge to spray them with heavy grease, which holds grit against the wire. A light garage door lubricant on the bottom rollers is fine.

Look at the cables when you’re already in the garage. You’re checking for three things: rust-colored staining, any broken strands, and whether the cable sits neatly in the drum grooves when the door is closed. If the door starts to look even slightly out of level, that’s the time to call, not after it jams.

Is it ever just a quick fix?

Sometimes. If a cable hopped the drum because the door hit an obstruction and nothing is damaged, re-hanging and re-tensioning takes less time than a full replacement. We’ll tell you if that’s all it needs. We won’t re-hang a cable with broken strands, though. It will fail again, likely at a worse moment.

Cable problems and spring problems travel together, so it’s worth reading our spring repair page too. If the door was forced while crooked, the track repair page explains what we look for there. For anything else, start with general garage door repair.

Tell us about the door

Garage Door Cable Repair in Franklin, WI

Where the cables are and what they do

How cable problems show up