What Lift Cables Do
A standard residential garage door has two lift cables — one on each side — that run from the bottom bracket of the door up to cable drums mounted on the torsion spring shaft above the door. When the torsion spring winds, it rotates the shaft and drums, winding the cables and lifting the door. When the spring unwinds, the cables lower the door in a controlled descent.
The cables don't just lift the door — they guide it. The cable on each side keeps the door panel aligned vertically as it travels up the track. When one cable snaps, that side of the door loses its guided support and the door drops suddenly on the unguided side, typically stopping partially open at an angle as the remaining cable and track prevent a full fall.
Why Cables Break
Lift cables are steel wire rope — multiple strands of wire twisted together for strength and flexibility. They fail for three main reasons: fatigue from repeated flexing around the cable drum (the metal work-hardens and eventually fractures), corrosion from moisture infiltration into the wire bundle (surface rust on the individual strands reduces their cross-sectional area), and mechanical damage from contact with track hardware or from being wound incorrectly onto the drum after a previous repair.
In the Tri-Cities, corrosion is less of a factor than in marine climates — Eastern Washington's dry air doesn't infiltrate cable bundles the way Puget Sound's humid air does. Fatigue is the dominant failure mechanism, and it's related directly to the number of cycles the door has seen. A cable on a door used 8 times daily (two adults, two vehicles, two trips each) sees 2,920 flex cycles per year — a cable that might last 20 years on a 4-cycle-per-day door may show fatigue at 10 years on an 8-cycle door.
Immediately After a Cable Snap
Stop using the door. The door is no longer properly supported on the side with the snapped cable — it's hanging from the track on one side and from the remaining cable on the other. Running the opener in this condition pulls the door further out of alignment and can bend track sections, pull the cable drum off the shaft, or cause the door panel to buckle.
If the door is in a partially-open position, don't try to pull it down manually. A door hanging from one cable and the track is under asymmetric load and can shift unexpectedly. If you need the garage secured, the practical answer is to leave the door in place and call for same-day service.
The Repair: Both Cables Replaced Together
When we replace a cable, we always replace both. The surviving cable has the same age, the same number of flex cycles, and the same wear history as the one that failed. Replacing only the broken cable leaves a cable near its fatigue limit on the other side — and a second cable failure within months is the predictable outcome. Two cables replaced together during one service call is consistently less expensive and less disruptive than one cable replaced twice in two separate calls.
Cable replacement also includes inspection of the cable drums and the bottom brackets where the cables attach. A drum with a groove worn into it by the cable, or a bottom bracket with a bent cable retainer, can cause a new cable to fail prematurely. We check and address these during the same visit.
How Much Does Cable Replacement Cost in the Tri-Cities?
A pair of standard lift cables: priced after on-site assessment
📞 Need Garage Door Repair in the Tri-Cities?
$65 service call applied toward repair. Same-day available in Kennewick, Richland, Pasco and surrounding communities.
Or call directly: (509) 517-3951