Why are my garage door cables loose and hanging slack?

Cables are the messengers, springs are the muscle

The lift cables on each side of your door do not pull anything by themselves. They transmit force from the spring-driven drums at the top down to the bottom brackets. When a spring holds proper tension, the cables stay guitar-string tight through the whole travel. The moment you see droop, a loop, or a cable dangling like a jump rope, the tension source upstream has failed or the cable has left its track on the drum. That is a diagnosis, not a cosmetic issue.

Running down the three causes

1. Broken or dying spring. This is the answer roughly eight times out of ten in our OKC service logs. A snapped torsion spring dumps all cable tension instantly. Look above the door for a 2-inch gap in the coil, described in how to spot a broken spring. A badly relaxed galvanized spring can produce mild slack at certain door positions too.

2. Cable jumped the drum. Each drum has machined grooves the cable must sit in. If the door bounces (hitting the floor hard, an opener with the down-force cranked, or an ice-swollen weather seal stopping the door early), the cable can momentarily go slack, then rewind outside its grooves or wrap over itself. One side ends up short, the door racks crooked, and the loose side droops. This one is sneaky because the springs are fine.

3. Door closed onto an obstruction. A shovel handle, a basketball, a trash bin lip, or a hard ice ridge along the threshold, an Oklahoma winter classic. The door stops early but the opener or the drums keep paying out cable for the missing inches of travel, and the slack appears at the bottom.

What not to do while it hangs slack

• Do not hit the opener button "to see if it fixes itself." Cycling a slack-cable door is how cables shred, doors rack, and openers strip gears.
• Do not pull the red emergency release with the door open. If a spring is broken, the door can free-fall the moment the trolley lets go.
• Do not rewind a cable onto a drum by hand. The drums are locked to a shaft that may still hold full spring tension; loosening a set screw with tension on the shaft is a hand injury waiting to happen.

The repair and what to expect

If the cause is a jumped drum with undamaged parts, the fix is resetting the cable and rebalancing the door, which is the least involved of the three repairs. If the spring broke, you are into a standard spring replacement, where door weight, single versus double springs, and the cycle rating you choose drive the work, and we routinely replace cables at the same time if they show wear, per our take on doing cables with springs. Slack that appeared overnight with a car trapped behind it qualifies for emergency service: 24/7 across Oklahoma City, Edmond, Moore, Norman, Yukon, and the rest of the metro, no after-hours premium, average arrival 20 to 50 minutes.