---
title: "Garage Door Cable Came Off the Drum"
page_title: "Garage Door Cable Came Off the Drum: Causes | Mesa AZ"
description: "Cable unspooled, looped over itself or hanging slack? What caused it, why the door now hangs unevenly, and what gets checked before it is rewound."
url: "https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-cable-came-off/"
type: "door-symptom"
published: "2026-09-01T19:27:07Z"
modified: "2026-09-01T19:35:07Z"
publisher: "Farnsworth Garage Door Service, Mesa, AZ"
phone: "(602) 935-9766"
---
# Garage Door Cable Came Off the Drum

A lift cable comes off its drum for one reason: at some point, the cable went slack while the drum kept turning. That's it. Everything else on this page is about *what made it go slack*, because the cable is the symptom and the slack is the event.

What you'll be looking at is a cable hanging loose, or gathered in loops around the shaft, or wound over the top of itself instead of sitting in the drum's spiral groove. The door is usually sitting unevenly — lower on the affected side — and it may be jammed, or it may still move, which is the more dangerous of the two.

Rewinding a cable is not a matter of putting it back. The drum has to be set to a specific position with the spring tension controlled, both cables have to end up carrying equal load, and if the underlying cause isn't found the whole thing repeats. We'll explain the mechanism fully. We're not going to publish the procedure.

⚠ **High risk — leave this to a technician** Involves high-tension components or the door’s full weight. This is where people get badly hurt.

This is general guidance based on what we see on service calls — it isn’t a substitute for someone looking at your actual door. Every door is a little different, and if anything here feels beyond what you want to take on, stop and [give us a call](tel:+16029359766).

## Stop operating the door now

The moment you see a slack or unspooled cable, the door has lost even support. One side is being carried and the other isn't, and every cycle from here drives the rollers into the track at an angle the track was not built to accept.

This is the stage immediately before a door leaves its track. A door that jumps the track while moving comes to a stop in a way nobody controls, and it turns a cable repair into a door repair. It's also the state where a partially raised door has nothing reliable holding one side of it.

Leave the door wherever it currently is, closed if it happens to be closed. Unplug the opener at the ceiling so no remote, app or timer can operate it. Keep cars, bikes, children and pets out of the opening, and don't try to level the door by pushing on it. If the cable has left its drum entirely, say so on the phone, because [cable drum replacement](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-drum-replacement/) needs different parts on the truck.

[Call (602) 935-9766](tel:+16029359766)

Start Here

## What to check in the next 10 minutes

Five minutes of looking, and it tells us most of what we need before we load the truck.

1.  1

    **Establish which side and what the cable is doing**

    Left or right, looking from inside. Then describe its state: hanging loose down the wall, coiled in a bird's nest around the shaft, wrapped over the top of itself on the drum, or off the drum entirely and lying on the floor. Those aren't the same and they don't all mean the same thing.

    You’ll know it worked when: You can name the side and describe the cable's position in one sentence.

2.  2

    **Look at the spring before you conclude anything**

    A clean gap in the coil above the door means the spring failed first and the cable came off as a consequence. No gap means the slack came from somewhere else, and that changes the diagnosis entirely. This is the single most useful thing you can determine.

    You’ll know it worked when: You've checked the spring and can say whether there's a gap.

3.  3

    **Check how the door is sitting**

    Stand outside and sight along the bottom edge against the concrete. A door that's noticeably lower on one side has lost support there. Note whether it's a small difference or an obvious one, and whether the door looks twisted in the opening rather than just tilted.

    You’ll know it worked when: You can say how far out of level the bottom edge is, roughly.

4.  4

    **Look at the floor of the opening**

    This is where the cause often is. A trash bin, a bag of softener salt, a bike pedal, a coiled hose, a board leaning against the wall. Anything the door could have landed on would have stopped the door while the drum kept unwinding, which is exactly how cables come off.

    You’ll know it worked when: You've looked at what's on the floor rather than assuming nothing was.

5.  5

    **Check the other cable too**

    People inspect the obvious one and stop. Look at the good side as well — whether it's still seated properly in its grooves, whether it's frayed anywhere, and whether the drum on that side has shifted on the shaft.

    You’ll know it worked when: You've looked at both drums, not just the one that failed.

## Did the spring go first, or did the cable?

Same-looking end state, two different repairs, and the answer is visible from where you're standing.

Is there a **visible gap in the spring coil** above the opening?

Yes — there's a gap

**What that means:** The spring failed and the sudden release of tension let the drums spin. The cable coming off is secondary damage. The repair is a spring job with cable and drum work attached, and the cable was never the problem.

**Where to go next:** Read cause 1, then the broken-spring page.

No — the coil is continuous

**What that means:** Then the slack came from somewhere else, and the something-else is the actual fault. The door landed on an obstruction, a drum slipped on the shaft, the cables were unequal, or the door was closed against a thrown lock. Any of those, and putting the cable back without finding it means doing this again.

**Where to go next:** Read causes 2 through 6.

I can't see the spring clearly

**What that means:** Look for the shaft running horizontally above the opening and follow it with a flashlight. If there's no shaft, you have extension springs alongside the tracks instead, and the tension release behaves differently — but the instruction to stop operating the door is identical.

**Where to go next:** Read cause 6, and leave the door alone either way.

This distinction changes what we bring. Saying “there's a gap in the spring” on the phone is worth more than any other single sentence you can offer.

## What a cable off its drum looks like

The specific presentation tells us something about how it happened.

Cable hanging loose down the wall, door sitting low on that side

Complete loss of wrap. Usually a sudden tension release rather than a gradual one.

[Jump to that fix ↓](#cause-1)

Cable wound over the top of itself on the drum

The drum kept turning while the cable had slack. Classic obstruction signature.

[Jump to that fix ↓](#cause-2)

Cable in a loose nest around the shaft

The drum spun several turns free. Points at a sudden release or a drum that let go of the shaft.

[Jump to that fix ↓](#cause-3)

Cable still on the drum but sitting outside its groove

Partial. Often from unequal cable tension rather than a single event.

[Jump to that fix ↓](#cause-4)

Happens repeatedly on the same side

Something about that side is wrong — drum position, a worn groove, or a track that isn't plumb.

[Jump to that fix ↓](#cause-5)

Door had been touching down on one corner for months first

The floor moved before the door did. A settled slab lets one side land early and slacken.

[Jump to that fix ↓](#cause-6)

## What the drums are actually doing

At each end of the shaft above your door there's a grooved aluminum drum, roughly the size of a large fist. The lift cable runs from the bottom bracket at the corner of the door, straight up the side of the opening, and wraps around that drum in a spiral groove. As the shaft turns, the drum winds cable on and the door goes up. Unwind it, and the door comes down.

The cable holds the door up only because it's under tension. Tension keeps it pressed into its groove. Take the tension away — even for a second — and the cable is just a loose wire sitting on a spinning aluminum wheel. It comes off almost immediately, and once it's off, the next turn of the drum wraps it somewhere it shouldn't be.

That's why every cause on this page is really the same cause with different origins. A spring lets go, and tension vanishes. The door lands on a bin, and the door stops while the drum keeps unwinding — tension vanishes. A drum slips on the shaft, and that side stops being wound — tension vanishes.

The other half of the picture is what the cable is under when everything's working. It carries the load the spring is holding, which is a substantial fraction of the door's weight, and it terminates at the **bottom bracket** at the lower corner of the door. That bracket carries factory warning labels for a specific reason: releasing it, or the cable, without controlling the spring tension first sends everything in the assembly somewhere at speed. That's the part of this repair that isn't about skill.

**Cable drum** The grooved wheel at each end of the shaft that winds the lift cable. Set to a specific position so both sides lift equally.

**Bottom bracket** Where the cable attaches at the lower corner of the door. Under full cable tension, and labeled accordingly.

**Slack** Any moment the cable isn't under tension. The one condition that lets it leave the drum.

**Drum set screws** What clamps each drum to the shaft. If they lose grip, that side stops being wound.

So the question a technician is answering isn't “how do I get this cable back on.” It's “what took the tension out, and is it still there?”

## Garage door anatomy: what every part is called

Naming the part you are looking at makes every other conversation easier — with us, with a home inspector, with a warranty department. The terms below follow DASMA’s own industry terminology, with the everyday word first where the two differ.

Simplified interior view of a closed four-section door. The ceiling-mounted track and opener are drawn receding into the garage. Not to scale.

### Every part, in order

1.  1 Section (panel) — One of the horizontal sections the door is built from. Most residential doors have four, joined by hinges so they can pivot as the door rolls overhead.
2.  2 Torsion spring — Wound spring above the opening that counterbalances the door’s weight. Under high tension at all times — removal, repair and adjustment are technician work.
3.  3 Torsion shaft — The shaft that transfers torque from the springs to the cable drums. Torsion springs are mounted on this shaft, which DASMA notes inherently provides containment if a spring breaks.
4.  4 Cable drum — Grooved drum at each end of the shaft. It winds the lift cable up as the door opens and pays it out as the door closes.
5.  5 Lift cable — Runs from the drum down to the bottom bracket on each side. Frayed or worn cable is a replace-it item, and DASMA says only a trained technician should do it.
6.  6 Bottom bracket under spring tension — **The loaded one.** The bottom bracket is connected directly to the counterbalance system, so it carries the full spring load whenever the door is down. DASMA is explicit: these brackets “should be adjusted or loosened only by a trained door systems technician,” and many manufacturers now fit tamper-resistant hardware here. Loosening one is how people get badly hurt.
7.  7 Top fixture — Bracket at the top corner of the top section. It holds the top roller and sets how the door meets the header when it closes.
8.  8 Graduated edge hinge (end hinge) — Hinge on the edge of the sections. It holds a track roller and is numbered so it goes back in the right place — that numbering is what makes the closed door sit flush against the jambs.
9.  9 Center hinge (intermediate hinge) — Joins one section to the next across the face of the door and lets them pivot as the door rolls into the horizontal track.
10.  10 Roller — Rides inside the track. On a healthy door you can slide and turn the roller stem in its bracket by hand — if you cannot, something is bent or bound.
11.  11 Vertical track — The straight run beside the opening. It is deliberately tilted back a little so the door does not rub the opening on the way up.
12.  12 Horizontal track — Carries the door back over your head. Its slight upward slope helps start the door down and helps keep tension on the cables.
13.  13 Track bracket — Fastens the vertical track to the jamb. These have to land in solid wood — DASMA has a whole sheet on why mounting into drywall alone is a problem.
14.  14 Strut (reinforcement) — Stiffener across a section that reduces how much it sags when the door is overhead, and adds wind-load capability.
15.  15 Bottom seal (astragal) — The compressible seal along the bottom edge that closes against the floor. In Arizona it is usually the first rubber part to go hard and shrink.
16.  16 Header seal — Seals the top of the opening against weather and light infiltration.
17.  17 Jamb seal — The seal down each side of the opening, usually nailed to the jamb outside the door. Also called stop moulding.
18.  18 Photo-eye sensors — The entrapment-protection beam across the bottom of the opening. Per the DASMA checklist the beam should sit no higher than six inches above the floor.
19.  19 Opener rail — The rail the opener’s trolley travels along, running from above the opening back to the power unit.
20.  20 Trolley — The carriage on the rail that connects to the door arm. Disconnecting it is what puts the door back on manual.
21.  21 Manual release handle (red) — UL 325 requires this handle to be red and easily told apart from the rest of the opener. It should be reachable and no more than six feet above the garage floor.

Terminology from DASMA Technical Data Sheet #160, *Sectional Garage Door Terminology* ([dasma.com](https://www.dasma.com/wp-content/uploads/2020/06/TDS160-Sectional-Garage-Door-Terminology.pdf)). DASMA states the sheet “is not to be construed as a standard-type document” and that the terms “are not universal” — manufacturers vary. Photo-eye and manual-release dimensions are from DASMA TDS #167 ([checklist for home inspectors and consumers](https://www.dasma.com/wp-content/uploads/2023/04/TDS167.pdf)).

## Working out what caused the slack

Match what you can see. The right-hand column is our honest read on urgency.

| What you’re seeing | Most likely cause | How urgent | Who should fix it |
| --- | --- | --- | --- |
| **Gap in the spring coil, both cables loose** | Spring failed and released all tension at once | Stop using it | Call a pro |
| **Cable overwrapped, something on the floor under the door** | Door landed on an obstruction while the drum kept unwinding | Stop using it | Call a pro |
| **Cable off, drum has visibly rotated on the shaft** | Drum set screws lost their grip | Stop using it | Call a pro |
| **Door consistently sat lower on one side beforehand** | Unequal drum setting or unequal cable length | Stop using it | Call a pro |
| **Same side comes off repeatedly after repair** | Worn drum groove, bent shaft, or a track out of plumb | Needs the root cause found | Call a pro |
| **Door had been touching one corner early for months** | Slab movement letting one side land before the other | Fix this week | Call a pro |
| **Manual side lock was engaged when the opener ran** | Door held down while the drums unwound | Stop using it | Call a pro |
| **Cable off and visibly frayed or kinked** | The cable is damaged as well as displaced — it needs replacing, not rewinding | Stop using it | Call a pro |
| **Door jammed at an angle and won't move at all** | Rollers binding against the track from the racked geometry | Stop using it | Call a pro |
| **Cable off but the door still runs** | The worst version — the door is cycling with one side unsupported | Unplug the opener now | Call a pro |

## What’s actually causing it

These are ordered the way we work through them on a real service call — cheapest and most common first, so you don’t start by replacing a part that was never the problem.

1

### A spring let go and the drums spun free

High risk — call a technician

The most common origin, and the one that reorders the whole repair. When a torsion spring fails, the tension it was holding disappears in a fraction of a second. The shaft is suddenly free to turn, the drums spin, and whatever cable was wrapped around them unwinds and drops.

You'll usually find both cables affected rather than one, and the door will be sitting on the floor or wherever it stopped. It's worth being clear that the cable did nothing wrong here — it was doing its job right up until the thing it was working against ceased to exist.

The practical implication is that this is a spring repair with cable and drum work attached. Rewinding cables onto a shaft with no working counterbalance accomplishes nothing.

How you can tell: A clean gap in the spring coil, an inch or two wide. Usually both cables loose. Often a loud bang somebody in the house remembers.

**Where to stop:** Unplug the opener and leave everything where it is. When you call, lead with the spring rather than the cable. It's the sentence that determines what gets loaded on the truck.

2

### The door landed on something on the way down

High risk — call a technician

The most common cause when the spring is intact, and the most preventable thing on this page.

The sequence is quick and completely undramatic. The door comes down, the bottom edge meets a trash bin or a bag of salt or a bike that has drifted an inch further into the bay than usual, and the door stops. The opener may reverse, or the safety may catch it, or it may not — but for a moment the door has stopped while the shaft is still turning. The cables go slack, the drums keep unwinding, and one or both cables come off their grooves.

The tell is a cable wound over the top of itself on the drum rather than lying loose. That overwrap is the signature of a drum that kept turning with nothing pulling the cable tight.

What makes it worse is that the door often still appears to work afterward. People find the bin, move it, run the door, and it goes — unevenly, with one side unsupported, working the rollers sideways in the track every cycle.

How you can tell: Something on the floor in the door's path, or evidence of it. Cable overwrapped at the drum. Door sitting low on one side and sometimes still operating.

**Where to stop:** Stop running the door immediately, even if it moves. A door cycling with a cable off its drum is the single fastest route to a door off its track, and re-railing a door is a considerably longer job than rewinding a cable.

3

### A drum slipped on the shaft

High risk — call a technician

Each drum is clamped to the shaft by set screws. Their job is to make the drum and the shaft turn as one piece, so that both sides of the door lift by exactly the same amount.

When those screws lose their grip — from vibration over years, from being under-torqued at install, or from the shock of a sudden stop — the drum stops turning with the shaft. That side stops being wound. The cable goes slack, comes off, and the door drops on that corner while the other side is still supported.

You can sometimes see it: a witness mark on the shaft where the drum used to sit, or a drum that's now sitting slightly out of position relative to the bearing plate. It's also the cause behind a door that has been drifting slowly out of level over weeks rather than failing suddenly.

How you can tell: The drum has visibly moved along or around the shaft, sometimes with a bright rub mark. The door had been getting progressively more uneven before the cable came off.

**Where to stop:** Don't try to reposition a drum. Its position on the shaft is what sets how much cable each side takes up, and it has to be set with the spring tension controlled — which is the part of this that isn't about having the right Allen key.

4

### The two sides were never taking up equal cable

High risk — call a technician

This is the slow version, and it usually traces back to a previous repair.

If the drums were set even slightly differently, or if a replacement cable came out marginally longer or shorter than its partner, one side takes up more cable per turn than the other. The door then rises very slightly out of level on every cycle. For a long time nothing happens — the door looks fine, and rollers tolerate a small amount of it.

What eventually happens is that on the way down, the low side reaches the floor first. The door stops. The high side's drum keeps unwinding for the last fraction of a turn, that cable goes slack, and it leaves its groove.

The tell is history rather than appearance: if somebody noticed a slight gap under one corner months ago and it seemed cosmetic, that was this.

How you can tell: The door was sitting a little uneven for a long time before the cable came off. Often follows a repair, a new door, or a house where somebody previously did their own cable work.

**Where to stop:** The important part here is that rewinding the cable alone reproduces the fault. Both drums have to be reset to match, which means both cables come under controlled tension — and that's the whole job rather than the last step of it.

5

### Something about that side keeps causing it

High risk — call a technician

If a cable has come off the same drum more than once, the answer isn't the cable and it isn't the winding. Something is repeating.

The candidates are a drum with a worn or damaged groove, so the cable no longer sits securely in it; a shaft that has a slight bend, which changes the wrap geometry through each rotation; a bearing plate that's loose on the wall, letting the whole assembly move under load; or a vertical track on that side that isn't plumb, which puts a sideways component into a cable that should be pulling straight.

None of those show up in a quick look, which is exactly why the second occurrence gets treated as bad luck. It isn't. A cable that comes off twice is reporting a geometry problem, and the useful thing you can do is say so on the phone rather than describing it as a fresh incident.

How you can tell: It's happened before, on the same side. Possibly after a repair that seemed to go fine.

**Where to stop:** Don't accept a third rewind without somebody looking at the shaft, the bearing plates and the track alignment. Repeating the same repair on the same side is how a small fault gets expensive.

6

### The slab moved, and the door started landing early

High risk — call a technician

The one that gets misdiagnosed most often around here, and it starts nowhere near the door.

Garage slabs in the Valley move. Expansive soils, post-tension construction and irrigation cycles mean a garage floor can settle at one corner over a period of years. It's usually a small amount — enough to see a wedge of daylight under one corner of a closed door, enough that people assume the door has sagged.

What that does mechanically is make one side of the door touch down before the other. The door stops on the high corner, the drum on the low side keeps unwinding for the last part of the travel, and that cable slackens on every single close. Do that for a few hundred cycles and one day it comes off.

What makes it worth naming is where homeowners get sent with it. A visible gap at one corner reads as a foundation issue, and people go looking for foundation contractors. Often the door simply needs setting to the floor it now has.

How you can tell: A wedge-shaped gap under one corner of the closed door that has been there for a while, and a slab with a visible crack or a step near the opening.

**Where to stop:** Worth mentioning as its own observation when you call. It changes the repair from “put the cable back” to “set the door to the floor as it is now,” and the second one lasts.

7

### The door was run against a thrown lock

High risk — call a technician

Less common than it used to be but still worth ruling out, particularly on older doors that kept their manual side locks after an opener was fitted.

If the sliding bar lock at the side of the door is thrown and somebody hits the remote, the opener tries to lift a door that is physically bolted to the track. The door doesn't move. On the way up that usually just stalls the opener. The version that takes cables off is the door being held at the bottom while the drums unwind past the point where the cable should have gone taut.

The related version is a lock that isn't fully retracted — the bar sitting proud enough to catch the track on the way past, stopping the door mid-travel with the same result.

How you can tell: A manual lock bar at the side of the door, and a household where somebody sometimes uses it. Often a scrape or bright mark on the track where the bar has been catching.

**Where to stop:** If the door has a manual lock that's still functional alongside an opener, worth asking us to disable or remove it on the visit. It's a genuine cause of exactly this and it earns its keep only on doors without openers. Mention it when you book the [garage door cable repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-cable-repair-replacement/) and it can be handled on the same visit.

## What you’ll need if you’re doing this yourself

-   **A flashlight** — the drums sit high in the corners of the garage where nothing is well lit
-   **Your phone camera** — a photo of the drum with the cable in whatever position it's in tells us more than any description
-   **Nothing you'd turn or pull with** — everything in this assembly is holding tension, and the point of this page is that it stays that way until someone controls it

## Things not to do — and why

× Don't try to rewind the cable onto the drum

The drum has to end up in a specific position with the spring tension controlled and both sides matched, or the door lifts unevenly from the first cycle. It isn't a matter of putting the wire back where it was.

× Don't loosen the drum set screws to free the cable

Those screws are the only thing holding the drum against the shaft's stored tension. Loosening them with the spring wound releases the assembly in a direction nobody is standing clear of.

× Don't touch the bottom bracket

It's where the cable terminates, it carries the full cable load, and it wears factory warning labels for that reason. Undoing it with tension in the system is the single worst thing available in this repair.

× Don't run the door because it still moves

One corner is unsupported, so every cycle pushes the rollers into the track sideways. This is the specific behavior that turns a cable repair into an off-track door, and it usually takes a handful of cycles rather than weeks.

× Don't push or lever the door back to level

The door isn't out of level because it's sitting wrong. It's out of level because one side has no support, and forcing the panel just loads hinges and rollers that weren't designed to take it.

× Don't clamp the track to hold the door while you look at it

A clamp concentrates a few hundred pounds into thin steel at one point. It bends the track, and now you have alignment work on top of a cable that still needs winding.

× Don't put the same cable back if it's frayed or kinked

A cable that has been overwrapped and crushed against itself has damaged strands, and a strand that has been kinked is where the next failure starts. Cables get replaced in pairs for the same reason springs do.

× Don't skip finding out what caused the slack

The cable is the consequence. If a drum is slipping, a track is out of plumb, or the floor has settled, the rewind lasts until the cause repeats — and you'll be reading this page again.

## The Valley-specific version of this

Two things push doors here toward slack cables that wouldn't apply in a lot of the country, and one of them is genuinely unusual.

The unusual one is the ground. Garage slabs across Mesa, Gilbert and Queen Creek sit on soils that move, and post-tension construction means they move as a unit rather than cracking evenly. A slab that has settled at one corner makes the door touch down early on one side, and that produces a slack cable on every single close — quietly, for years, until the day it comes off.

-   **Settled slabs put a wedge of daylight under one corner** — homeowners read that as a door problem or a foundation problem, and it's very often a door that needs setting to the floor it now has.
-   **Monsoon grit gets into everything** — fine silt packs into the bottom of the vertical tracks and into roller bearings, and a door that binds is a door that can stop mid-travel and slacken a cable.
-   **Garages here are storage first** — heat pushes everything out of the yard and into the bay, which means more things sitting near the door's path than in a climate where a shed is usable in July.
-   **Springs reach the end sooner** — and the reason DASMA actually gives is worth repeating, because it's the opposite of what most people assume. Their spring cycle-life sheet doesn't blame ambient heat; it blames doors left open for extended periods, and it recommends that doors in extreme-heat climates “be kept closed where possible.” A Valley garage that stands open every afternoon is spending spring life, and a spring failure is the most common single origin of a cable off its drum.
-   **Dust and dry air are hard on cable** — the wire is galvanized, but grit working into a stranded cable at the drum is abrasive, and abrasion is what turns a displaced cable into a replaced one.

## Keeping cables where they belong

Most of this is about the door never stopping unexpectedly on the way down, which turns out to be a housekeeping problem as much as a mechanical one.

-   **Keep a clear foot of floor inside the door** — bins, salt bags, hoses and bike pedals are the single most common cause of a cable coming off, and they drift without anyone noticing.
-   **Look along the bottom edge from outside twice a year** — a door sitting even against the concrete takes five seconds to confirm, and an uneven one is the early warning for all of this.
-   **Watch the door land occasionally** and check that both corners touch at the same moment. One corner landing early is the setup for a slack cable.
-   **Take a slab gap seriously** — a wedge of daylight under one corner isn't cosmetic, it's the floor telling you the door no longer matches it.
-   **Have the cables and drums looked at during a tune-up** — fraying, uneven spooling and drum position are all visible to somebody who knows what they're looking at, and none of them are visible from the driveway.
-   **Remove or disable a manual lock if you have an opener** so nobody can bolt the door and then hit the remote.
-   **Stop the door immediately if it ever lands on something** and have it checked rather than assuming the reversal caught it. The slack happens in the moment of contact, not afterward.

## Where this sits in the sequence

This is the fourth stage of the most common failure chain on a residential door, and each step genuinely produces the next.

[A spring breaks and the counterbalance goes](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-spring-broke/)

→

[The door's full weight appears and it becomes too heavy to lift](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-too-heavy-to-lift/)

→

[Uneven force lifts one side ahead of the other and the door goes up crooked](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-crooked-one-side/)

→

The slack side unspools and the cable leaves its drum *(you are here)*

→

[With one corner unsupported, the door jumps the track](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-off-track/)

There's exactly one step left after this one, and the gap between them is measured in cycles rather than weeks. That's why the instruction to unplug the opener is the most useful line on the page.

## What rewinding a cable actually involves

The winding itself is a small part of it. Most of the visit goes into making sure the same thing doesn't happen again next month.

What we do on a visit for this

-   Secure the door and bring the spring tension under control before anything is unwound
-   Inspect both cables end to end for fraying, kinks and crushed strands from the overwrap
-   Replace cables in pairs where either shows damage, so both sides have matched condition
-   Check both drums for worn or burred grooves that would let a cable ride out again
-   Verify the drum set screws and the shaft seating, and check the shaft for run-out
-   Check both bearing plates are tight to the wall and that the shaft turns without binding
-   Check both vertical tracks are plumb and the bottom brackets are sound
-   Reset both drums so the two sides take up cable equally, then confirm the door lands level
-   Re-test balance by hand and run the safety reversal test the way UL 325 requires

You'll get a written quote before any work starts.

The service that fixes this

When you want it handled rather than diagnosed, this is the page for it: [garage door cable repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-cable-repair-replacement/). Depending on what you find, [cable drum replacement](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-drum-replacement/) may be the closer fit.

## What decides the size of this job

A cable rewind on its own is a modest repair. What varies is everything that came with it.

-   **Whether a spring failed first** If the counterbalance is gone, the cable work is a secondary part of a spring replacement rather than the job itself.
-   **Whether the cable is reusable** A cable that overwrapped and crushed against itself has damaged strands. That's a replacement, and cables get replaced in pairs.
-   **Drum condition** A groove that's worn or burred will shed a cable again. Replacing a drum is inexpensive; discovering it on the second call isn't.
-   **How many cycles were run after it came off** A door cycling with one side unsupported wears rollers, loads hinges and bends track. That's the difference between one repair and three.
-   **Whether the door needs setting to a moved floor** If the slab has settled, the fix includes matching the door to the floor as it now is, rather than restoring it to a geometry that no longer exists.
-   **Track and roller condition** Anything the racked door damaged on its way to being noticed becomes part of the same visit, and it's cheaper handled together.

Most of what shapes a [garage door cable repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-cable-repair-replacement/) is parts and the geometry work around them rather than clock time. You'll get a written quote before any work starts. If you're due anyway, our full tune-up is $39.99 — same price in every city we serve.

## Still stuck? We’ll come take a look.

Same-day service is our standard across Mesa, Gilbert, Chandler, Queen Creek, Scottsdale, Phoenix, and the rest of the Valley.

[Call (602) 935-9766](tel:+16029359766) [Book an appointment](https://farnsworthgarage.com/book-appointment-now/)

Due for a check-up while we’re out? Our full tune-up is **$39.99** — same price in every city we serve.

## Related problems we see with this one

[Garage Door Cable Snapped Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-cable-snapped/) [Garage Door Is Crooked or Hanging on One Side Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-crooked-one-side/) [Garage Door Came Off Its Track Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-off-track/) [Garage Door Spring Broke Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-spring-broke/)

## Questions we get asked about this

### Why did my garage door cable come off the drum?

Because the cable went slack at some point while the drum kept turning. Tension is the only thing keeping a cable seated in its groove. The usual origins are a broken spring releasing all tension at once, the door landing on something on the way down, a drum slipping on the shaft, or one side of the door reaching the floor before the other.

### Can I put the garage door cable back on myself?

It isn't a matter of putting it back. The drum has to be set to a specific position with the spring tension controlled, and both sides have to end up taking up cable equally or the door lifts out of level from the first cycle. The cable also terminates at the bottom bracket, which is under the full load the spring is holding — that's why it carries factory warning labels.

### Is it safe to use my garage door with a cable off?

No, and this is the one to take literally rather than as general caution. One corner of the door has no support, so every cycle drives the rollers into the track at an angle it wasn't built for. This is the stage immediately before a door comes off its track, and it usually takes a handful of cycles rather than weeks.

### Why is one side of my garage door lower than the other?

Because that side has lost its support — a cable off its drum, a cable that has snapped, or a drum that has slipped on the shaft. It is not caused by one of two torsion springs breaking; both springs sit on the same shaft and share the load, so a broken spring makes the door uniformly heavy rather than crooked.

### Did a broken spring cause my cable to come off?

Very often, yes. When a torsion spring fails, the tension disappears in a fraction of a second, the shaft is free to turn, and the drums spin and shed whatever cable was wrapped on them. Look for a clean gap in the coil above the door. If it's there, this is a spring repair with cable work attached.

### What does it mean if the cable is wrapped over itself on the drum?

That overwrap is the signature of a drum that kept turning while the cable had no tension on it. The most common reason is the door landing on something — a bin, a hose, a bag of salt — so the door stopped while the shaft was still unwinding. Check the floor under the door's path.

### Should both cables be replaced if only one came off?

If either is damaged, yes. They've done identical work for identical time, so their condition tracks together, and a cable that has been crushed against itself has compromised strands. If a cable has simply come off its groove undamaged, it can go back on — but that's a judgment made with it in hand, not from the driveway.

### Why does my cable keep coming off the same side?

Something about that side is repeating, and the cable is reporting it rather than causing it. The usual suspects are a worn or burred drum groove, a bearing plate that's loose on the wall, a slight bend in the shaft, or a vertical track that isn't plumb. A second occurrence should trigger a look at geometry rather than another rewind.

### Can a settled garage floor cause a cable to come off?

It genuinely can, and it's underappreciated here. If the slab has settled at one corner, the door touches down on the high side first and stops, while the drum on the other side keeps unwinding for the last part of the travel. That slackens the same cable on every close, for years, until one day it leaves the groove.

### How long does it take to fix a cable off the drum?

Most of these are a same-visit repair, and same-day service is our standard across the Valley. The variable isn't the winding — it's what else turns out to need attention, since a cable rarely comes off without something having caused it and often without something else having been damaged.

### My door still works with the cable off. Is that OK?

It's the worst version of this, not the best one. A door that still runs is a door that's being cycled with one corner unsupported, which is exactly how a track gets bent and a door leaves its rails. Unplug the opener rather than taking the movement as reassurance. Movement isn't a green light — the [garage door cable repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-cable-repair-replacement/) still needs to happen before the door runs again.

### What's the difference between a cable coming off and a cable snapping?

A cable off its drum is intact but displaced — the wire is fine, it's just no longer where it should be. A snapped cable has physically parted, usually from corrosion or fraying at the bottom bracket end, and it releases its load instantly. Both leave the door unsupported on one side, but they're different repairs and they have different warning signs.

### Where this information comes from

-   [DASMA Technical Data Sheet #160 — Sectional Garage Door Terminology](https://www.dasma.com/wp-content/uploads/2020/06/TDS160-Sectional-Garage-Door-Terminology.pdf) — the industry definitions this page uses — counterbalance system, torsion shaft, and the distinction between a broken cable device and a cable safety device. DASMA describes neither as guaranteed to stop a falling door
-   [DASMA Technical Data Sheet #190 — Factors Affecting Spring Cycle Life](https://www.dasma.com/wp-content/uploads/2021/12/TDS190.pdf) — the doors-left-open passage behind the Arizona note on this page. It carries no cycle-count rating
-   [DASMA Technical Data Sheets (full index)](https://www.dasma.com/technical-data-sheets/) — industry reference covering counterbalance hardware, drums and cable practice
-   UL 325 — safety standard for residential garage door operators — the reversal requirement we re-test once the door's geometry has been restored

Serving the Valley

## Where we come out

We’re a family-run shop based in **Mesa**, and we cover the whole Phoenix metro. Same-day service is our standard — pick your city, or just call [(602) 935-9766](tel:+16029359766) and we’ll find the soonest slot that works.

[Phoenix Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/phoenix-arizona-garage-door-repair-and-service/) [Mesa Our home base](https://farnsworthgarage.com/service-areas-garage-door-repair/mesa-arizona-garage-door-repair-and-service/) [Gilbert Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/gilbert-arizona-garage-door-repair-and-service/) [Chandler Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/chandler-arizona-garage-door-repair-and-service/) [Queen Creek Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/queen-creek-arizona-garage-door-repair-and-service/) [Scottsdale Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/scottsdale-arizona-garage-door-repair-and-service/) [Tempe Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/tempe-arizona-garage-door-repair-and-service/) [San Tan Valley Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/san-tan-valley-arizona-garage-door-repair-and-service/) [Apache Junction Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/apache-junction-arizona-garage-door-repair-and-service/) [Gold Canyon Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/gold-canyon-arizona-garage-door-repair-and-service/) [Fountain Hills Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/fountain-hills-arizona-garage-door-repair-and-service/) [Maricopa Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/maricopa-arizona-garage-door-repair-and-service/) [Guadalupe Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/guadalupe-arizona-garage-door-repair-and-service/)

Not sure if you’re in range? Give us a call — if we can’t get to you, we’ll point you to someone who can.

Mesa-based · Serving the whole Phoenix Valley

## Want us to just take care of it?

If you’ve worked through this and you’d rather have someone who does this every day handle it — that’s us. Tell us what your garage door is doing and we’ll come diagnose it properly.

[☎ (602) 935-9766 Call or text — we pick up](tel:+16029359766) [Book online Pick your own time slot](https://farnsworthgarage.com/book-appointment-now/)

-   **Same-day service** is our standard
-   **Family-owned** right here in Mesa
-   **Straight answers** — we’ll tell you if it’s not worth fixing
-   **Written quote** before any work starts

Due for a check-up anyway? Our full tune-up is **$39.99** — same price in every city we serve, and we’ll go through the whole system while we’re there.

Mesa · Gilbert · Chandler · Queen Creek · Scottsdale · Tempe · Phoenix · San Tan Valley · Apache Junction · Gold Canyon · Fountain Hills · Maricopa · Guadalupe

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Source: https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-cable-came-off/ · HTML version with images, galleries and booking form. Farnsworth Garage Door Service, Mesa, AZ · (602) 935-9766