Garage Door Cable Repair & Replacement
Garage door cables do the heavy lifting — literally. They connect the bottom brackets of your door to the spring system above, transferring all that stored energy into smooth vertical movement. A standard galvanized cable is about 3/32 to 1/8 inch thick aircraft-grade wire rope, and it handles thousands of pounds of tension over its lifetime. When one snaps or jumps off the drum, your door goes crooked, jams in the tracks, or drops without warning.
How Garage Door Cables Work
On a torsion spring system, two lift cables wrap around drums on either end of the spring shaft. As the spring unwinds, the cables unspool evenly from the drums and lower the door in a controlled motion. On extension spring systems, cables run through a pulley arrangement along the horizontal tracks.
There are also safety cables — thin steel cables that thread through the center of extension springs. If an extension spring breaks, the safety cable keeps the spring from flying across the garage. If your extension springs don't have safety cables, you're operating without a critical safety feature that should be added immediately.
Signs Your Cable Needs Attention
- Door hangs crooked or tilts to one side — one cable has snapped or jumped off the drum while the other is still intact
- Visible fraying or bird-caging — individual wire strands are breaking and fanning out, weakening the cable
- Cable is loose or hanging down — it has come off the drum, usually because the drum itself shifted on the shaft
- Door dropped suddenly while closing — a cable broke under tension, letting the door free-fall on that side
- Grinding or scraping noise — a frayed cable is rubbing against the track or the door panel edge
- You can see the cable wound unevenly on the drum — it's overlapping or crossing itself, which means it will jam soon
What Causes Cables to Fail
Most cable failures come down to wear and friction. Every time your door cycles, the cable bends around the drum and straightens again. After 8,000 to 12,000 cycles, individual wire strands start to fatigue and break — that's the fraying you see. Rust accelerates the process, especially in humid climates or garages that aren't insulated.
Cables also fail when other components go bad first. A worn bottom bracket can create a sharp edge that cuts through the cable. A spring that's losing tension puts uneven stress on the cables. And if a cable ever jumps off the drum and gets re-wound by the opener motor, the damage is already done — that cable should be replaced, not just repositioned.
The Repair Process
Cable replacement starts with locking down the door and releasing spring tension. The old cable is unwound from the drum, and we inspect the drum itself for grooves, cracks, or misalignment. A worn drum will chew through a new cable in months, so we replace it if needed. The new cable gets wound precisely into the drum grooves — even one overlapping wrap causes binding. After installation, we balance the door and verify that both cables carry equal tension.
We always replace both cables at the same time. They wear at the same rate, and a new cable paired with an old one creates uneven tension that pulls the door off-center.
