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Garage Door Cable Snapped or Frayed
in Glendale, CA
Garage door cables run from the bottom corners of the door up and around a drum near the ceiling, and they carry a huge amount of tension every time the door moves. On older Glendale properties, especially in neighborhoods like Adams Hill, original cables may be 25 or 30 years old and showing visible rust and fraying. A cable that lets go suddenly can drop the door, bend the tracks, and damage anything underneath it.
Quick Answer
Garage door cables are steel wires that work with the springs to hold the door's weight and keep it balanced. When a cable snaps or frays badly, one side of the door drops and the whole system is under uneven stress. In Glendale, cables on doors built before 1995 are often the original cables and are well past a safe service life. Stop using the door as soon as you see fraying and call for service, because a snapped cable under tension can whip and cause serious injury.
Telltale Signs
Warning Signs to Watch For
- One side of the door hangs lower than the other when closed
- A loose, coiled cable is visible on the garage floor or hanging off the drum
- The door jerks sideways as it moves instead of going straight up
- Visible rust, fraying, or individual broken wires on the cable
- The opener strains heavily and the door moves very slowly on one side
- A loud snap followed by the door dropping or tilting to one side
Root Causes
What Causes Garage Door Cable Snapped or Frayed?
Cable Age and Rust
Steel cables corrode slowly when exposed to moisture and oxygen. In Glendale garages that face north or have poor airflow, humidity builds up around the cable drums and accelerates rust. Rusted cables lose tensile strength and snap under loads they would have handled easily when new.
The Fix
Cable Replacement
Both cables are replaced at the same time even if only one has broken. Replacing just one leaves the other, which is equally worn, ready to snap within weeks. The new cables are run through the drums and tensioned to balance the door evenly.
Drum Groove Wear
The cable wraps around a grooved drum at each upper corner of the door. When the groove wears smooth or develops a burr, the cable rubs against a sharp edge every cycle. That constant rubbing cuts through individual wires one at a time until the cable fails.
The Fix
Drum and Cable Replacement
The worn drum is replaced along with the cable because a new cable will fray again quickly if run over a damaged drum surface. Both sides are replaced together so the winding stays even.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Cable Age and Rust | Drum Groove Wear |
|---|---|---|
| Cable looks rust-colored and has individual wires sticking out | ||
| Cable snapped on a door that was working normally the day before | ||
| Fraying appears near the drum where the cable wraps around | ||
| Cable wears through repeatedly even after replacement | ||
| Both cables look similarly rusty even though only one snapped |
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