Garage Door Is Crooked or Hanging on One Side
You noticed it from the driveway: the bottom edge isn't parallel to the concrete any more. One corner is up, the other is down, and the door looks like it's being pulled sideways into the opening.
What that means is simple to state and important to get right. The two bottom corners of a sectional door are lifted by two separate cables, and those cables have to release and take up in step with each other. When one takes up faster than the other, the door climbs unevenly. The tilt is the readout.
Before anything else, one correction, because the internet gets it wrong constantly: a crooked door is not caused by one of two springs breaking. Both springs on a torsion setup sit on the same shaft. They turn together. If one lets go, the whole door gets heavy at once — evenly. It does not sag at one end. The tilt is a cable, a drum, or something on one side of the door binding.
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.
How urgent this is
Stop cycling the door now — including the one last test to see how bad it is. A tilt of an inch or two at the bottom edge is enough to be worth stopping over, and a tilt you can see from across the street is well past that.
A tilted door is running its rollers at an angle inside a channel built for them to run straight. Each cycle drives the wheels against the track lip, works the hinge fixings, and lets the loose cable wander further across its drum. This is the last quiet stage before something loud happens.
Leave the door wherever it currently is — a tilted door that's down is fine to leave down, and one that's up is safer left up than brought down uncontrolled. Unplug the opener so nobody can operate it, park outside, and keep the opening clear. If the door has also come out of its rails, mention it, since that turns the visit into an off-track garage door repair.
Call (602) 935-9766What to check in the next 10 minutes
Four observations from outside the opening. They separate a door that's tilted from a door that's merely sitting on an uneven floor, which is a completely different and much smaller problem.
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1Watch the bottom edge through a full open, from outside
Not from inside where the light is behind it. Stand in the driveway and watch the bottom edge against the concrete as the door rises. A door that starts level and goes out of square as it climbs is a live cable or drum problem. A door that's out of square from the first inch is more likely a track or bracket that has moved.
You’ll know it worked when: You can say whether the tilt appears during travel or exists at rest.
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2Look at both cables where they meet the drums
The drums sit at each end of the shaft above the opening. On a healthy door the cable winds into its grooves in a neat single layer. You're looking for one that's slack, riding over the top of itself, sitting outside its grooves, or bunched near one end of the drum.
You’ll know it worked when: You've compared the left drum against the right, rather than just looked at one.
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3Look at the spring coil above the door
A break shows as an obvious gap, like a piece has been removed. Note it if you see it — but note also that a break makes the door uniformly heavy rather than one-sided. Finding a gap tells you why the door is being forced, not why it's tilted.
You’ll know it worked when: You know whether the counterbalance is intact.
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4Check whether one side is being held back
Look down both vertical tracks and along both sides of the door for something physically restraining one end — a slide lock partly thrown, a shelf bracket in the path, a roller that has jammed, a hinge that has come apart, or an object leaning against the door on one side.
You’ll know it worked when: You've ruled a physical obstruction in or out on both sides.
Is the door tilted, or is the floor?
This one question separates an urgent mechanical fault from a cosmetic annoyance, and plenty of people call us about the second thinking it's the first.
The cheap diagnostic is a tape measure: bottom edge to floor at the left end, then at the right end, with the door most of the way down. More than about an inch of difference is a door out of square rather than a floor out of level.
Which version of crooked is it?
The specific pattern narrows the cause considerably.
One cable is unwinding faster than the other — usually spooling problems on a drum.
Jump to that fix ↓The classic signature of a cable riding out of its grooves or a drum slipping on the shaft.
Jump to that fix ↓Something is physically holding one side down — a lock, a jammed roller, a broken hinge, an obstruction.
Jump to that fix ↓The counterbalance failed and the door has been driven by the opener since, which loads it unevenly.
Jump to that fix ↓That side isn't being carried at all. This is the state just before an off-track event.
Jump to that fix ↓Not a door problem. The floor is uneven or the seal has compressed unevenly.
Jump to that fix ↓A top roller bracket has shifted or a hinge at the top has failed. Different fix, same urgency.
Jump to that fix ↓Why two sides have to move as one — and why it isn't one spring
Above the opening runs a steel shaft. The springs are mounted on it, and so is a grooved drum at each end. A cable runs from each drum down to a bracket at the bottom corner of the door. When the shaft turns, both drums turn with it, both cables wind on together, and both corners rise together. That's the entire lifting system.
Now the correction that matters. On a door with two torsion springs, both springs sit on that same single shaft. They are not independent — they can't be. Turn one end of the shaft and the other end turns too. So when a spring breaks, the door doesn't sag at that end; it simply loses roughly half its counterbalance everywhere at once and gets heavy across the whole width. If you have read that a lopsided door means one spring went, that is the thing to unlearn. It comes up in almost every conversation we have about this symptom.
What genuinely produces a tilt is a difference between the two cables. If the left cable is winding onto a drum in a neat helix and the right cable has climbed over the top of its own wraps, the right side is now effectively on a larger diameter and takes up more cable per turn of the shaft. That corner rises faster. Reverse it and it rises slower. Either way the door skews.
The other route is a drum that has slipped on the shaft. Each drum is held by set screws bearing on the shaft. If those loosen, the drum can rotate relative to the shaft, effectively paying out cable on one side while the other holds. That produces a tilt that gets worse in one direction, cycle after cycle.
And the third route is a bind: one side of the door held back by a jammed roller, a failed hinge, a lock, or an obstruction. The shaft still turns evenly, but one corner physically can't follow, so the sections rack and the door goes out of square.
So the reading is: even tilt during travel means the two cables are no longer in step, and a door held back on one side means something physical is stopping that corner. Neither is a spring failing on its own.
Matching the pattern to the cause
The way the tilt behaves tells you a great deal. Find the closest row.
| What you’re seeing | Most likely cause | How urgent | Who should fix it |
|---|---|---|---|
| Tilt increases the higher the door goes | A cable riding out of its drum grooves and lifting on a bigger effective diameter | Stop using it | Call a pro |
| Tilt has gotten worse week by week | Drum creeping on the shaft as the set screws lose their grip | Stop using it | Call a pro |
| One cable visibly slack, that corner drooping | That side has lost support entirely — the cable is off or has come loose at a fixing | Stop using it | Call a pro |
| Door is heavy AND crooked, spring shows a gap | Counterbalance failed; the opener has been lifting from one center point and racking the door | Stop using it | Call a pro |
| Out of square from the very first inch of travel | One side physically restrained — a slide lock, a jammed roller, a failed hinge | Stop using it | Call a pro |
| Top of the door leaning, bottom sections square | Top roller bracket shifted or top hinge failure | Fix today | Call a pro |
| Appeared right after the door hit something | Impact moved a track or bracket, so one side now runs on a different line | Stop using it | Call a pro |
| Square through travel, uneven gap only when closed | Uneven slab or a compressed seal — not a lifting fault at all | Fix this month | Either — call us if unsure |
| Door binds and shudders on the same side each time | Vertical track out of plumb on that side, often from a loosened bracket | Fix today | Call a pro |
| Grinding or popping noise accompanying the tilt | Rollers being driven into the track lip by the skew | Stop using it | 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.
A cable has climbed out of its drum grooves
High risk — call a technicianThe most common cause and the most reliably misread one. The drum is grooved so the cable lays in a single neat helix, each wrap sitting beside the last rather than on top of it. If the cable ever goes slack while the drum keeps turning — which happens if the door touches down early, hits an obstruction on the way down, or is pushed down by hand faster than the shaft unwinds — the cable can jump a groove and start wrapping over itself.
From that moment, that corner is being lifted on a larger effective radius. It rises faster than the other. The door goes up progressively more out of square, and the further it goes the worse it gets.
The reason this is urgent rather than annoying: a cable wrapped over itself gets crushed between its own wraps under load. That damages the strands, and a damaged cable is a cable heading for a failure of its own.
How you can tell: The tilt grows as the door rises and is worst at full open. Looking up at the drum, the cable is stacked over itself rather than sitting in single-file grooves.
A cable drum has slipped on the shaft
High risk — call a technicianEach drum is clamped to the shaft by set screws that bite into it. Those screws only need to slip a fraction for the door to lose its symmetry, because a drum that rotates relative to the shaft has effectively paid out cable on that side without the other side doing the same.
Set screws let go for ordinary reasons: they were never fully torqued at installation, the shaft has a flattened or burred spot where they've been sitting, or years of daily heat cycling in a Mesa garage have worked them looser. Once one starts creeping, it creeps a little more every cycle, which is why this version of the symptom gets steadily worse rather than appearing overnight.
What makes it different from cause 1: the cable is usually sitting perfectly well in its grooves. Nothing looks wrong with the spooling. The tilt is coming from the drum's position relative to the shaft rather than the cable's position on the drum.
How you can tell: A tilt that has grown gradually over days or weeks, with both cables spooling neatly. Sometimes there's a witness mark on the shaft where the set screw has been walking.
The counterbalance failed and the opener has been racking the door
High risk — call a technicianHere's where a broken spring genuinely does end up producing a crooked door, just not the way it's usually described.
When the springs stop carrying the weight, the opener becomes the lifting mechanism — and the opener connects to the door at a single point, at the center of the top section. Lifting a couple of hundred pounds from one center point on a door engineered to be lifted from both bottom corners makes the door flex. The center leads, the outer corners lag, and the whole assembly works through its travel twisted.
Do that for a handful of cycles and the tilt becomes structural rather than momentary: hinges take permanent set, the cables spool unevenly because the corners aren't arriving at the right heights, and now you have both a spring problem and a geometry problem.
This is why the spring page and this one are neighbors on the failure chain. It isn't that one spring caused a tilt. It's that a failed counterbalance plus continued use causes a tilt.
How you can tell: A visible gap in the spring coil, an opener that sounds like it's working hard, a door that got heavy suddenly, and the tilt appearing after all of that rather than before.
One side of the door is being physically held back
High risk — call a technicianThe straightforward version, and worth ruling in early because it's the one where something obvious is going on.
Candidates, in roughly the order we find them: a manual slide lock partly engaged on one side, which is startlingly common on doors where somebody used the lock during a vacation and forgot; a roller that has seized and is skidding rather than rolling; a hinge that has cracked or lost a fastener so the section end isn't being carried properly; a shelf bracket, garden tool or storage rack drifted into the track's path; and a vertical track knocked out of plumb so the rollers on that side are fighting the channel the whole way.
The shaft turns evenly through all of this. Both cables take up correctly. But one bottom corner physically cannot follow, so the door twists — and the twist is what you're looking at.
How you can tell: The tilt is present from the first inch of movement rather than developing with height, and there's usually a noise from the side that's binding.
A track, bracket or roller carrier has moved
High risk — call a technicianTrack hardware defines where the door is allowed to be. Move it and the door has no choice but to follow.
The specific culprits: a jamb bracket whose lag screws have backed out of the wood, so the vertical track has drifted toward or away from the door on that side; a flag bracket that has shifted, which changes the alignment where vertical meets horizontal; a top roller carrier that has worked loose, letting the top of the door lean; or a horizontal track hanger whose fixing into the ceiling framing has pulled.
Around here, the cause behind the cause is usually thermal. Garage framing in Gilbert or Chandler goes through a serious temperature swing every day of the year, and lag screws in wood that keeps moving don't stay as tight as they were. Nothing breaks. Everything shifts a little, and the door reports the shift as a tilt.
How you can tell: The tilt is consistent rather than progressive, and there's visible evidence in the hardware — a bracket standing proud, a lag screw you can turn with your fingers, a track that isn't parallel to the jamb.
The door is square and the floor isn't
Basic checkWorth stating clearly because a good number of people arrive here with this rather than a mechanical fault.
If the door hangs and travels perfectly square but there's a wedge of daylight under one end when it's fully closed, the door isn't crooked — the concrete is. Garage slabs are poured with a drainage fall, and around the Phoenix area expansive soil means plenty of them have settled further since. A slab that has dropped three-eighths of an inch at one corner produces a gap that looks alarming and means nothing about the door.
The reason it's worth separating from everything above: this is a sealing problem, not a lifting problem, and the fix is at the bottom of the door rather than at the shaft.
How you can tell: Measure bottom edge to floor at both ends with the door partly open — it'll be equal. The gap only appears when the door is fully down, and it follows a visible dip or slope in the concrete.
What you’ll need if you’re doing this yourself
- A tape measure — measuring bottom edge to floor at both ends is the single test that separates a tilted door from an uneven slab
- A flashlight — the drums are above head height at each end of the shaft, and cable spooling is impossible to judge in shadow
- Your phone camera — a photo of each drum, taken from the same angle, makes the difference between them obvious — and tells us what to bring
Things not to do — and why
Both torsion springs share a single shaft and turn together. A break makes the door uniformly heavy, not lopsided. Chasing the wrong part costs a visit and leaves the actual cable fault alone.
Every cycle drives the rollers harder against the track lip and lets the misbehaving cable wander further across its drum. Monitoring it is the same activity as making it worse.
A cable that looks limp is still part of a system holding the door's full weight under wound spring tension. Slack on one side doesn't mean the load has gone anywhere — it means it moved.
Releasing a drum from the shaft while the spring is wound hands the entire counterbalance to nothing. Winding bars and a controlled procedure are what make this a repair rather than an event.
The bottom brackets anchor the lift cables and carry the full tension the springs hold. The factory puts a warning label on them, and a crooked door is not the moment to test whether it's overcautious.
It hides an uneven gap without changing why the gap exists, and on a genuinely tilted door it introduces a hard point that the door then drives itself into.
It opening is what's causing the damage. A tilted door works every cycle, right up until the cycle where a roller leaves the channel.
What makes this show up here
Two Arizona factors feed this symptom, and they work on completely different timescales.
The slow one is thermal. A garage in Mesa or Queen Creek runs through a daily temperature swing that most of the country only sees seasonally, and it does it year-round. Fasteners in wood framing walk. Set screws relax. Nothing announces itself — the door just gets a fraction less symmetrical each year until the tilt is visible from the driveway.
- Set screws relax with heat cycling — the drum clamps that hold your door square sit in a garage that expands and contracts every day. Loosening is gradual and invisible until the tilt shows.
- Slabs settle here — expansive soil moves floors, which produces the uneven closed gap that gets mistaken for a crooked door. Measuring rules it in or out in thirty seconds.
- Springs fatigue faster in extreme climates — springs here rarely reach the life a mild climate would give them — and DASMA's cycle-life guidance is narrower than it's usually quoted, pointing at doors left standing open rather than at ambient heat, and a counterbalance that fails early is what puts the opener in the position of racking the door.
- Monsoon silt in the drums — fine dust settles on the shaft and drums and works into the cable wraps. It's abrasive, and it doesn't help a cable stay where it belongs.
- Summer avoidance — a door that starts running a little uneven in June frequently doesn't get looked at until the weather breaks. Those are the calls that arrive as off-track doors in October.
Keeping the door square
Symmetry is easy to check and easy to lose. These are the habits that keep it.
- Watch a full open from the driveway twice a year — the bottom edge should stay parallel to the concrete the entire way. Ten seconds, and it catches every version on this page early.
- Compare the two drums when you're in the garage anyway — a cable in single-file grooves on both sides is what normal looks like. Once you've seen it, the wrong version is obvious.
- Never let the door land on anything — an object under the door goes slack-cable-then-jumped-groove in one cycle. That's the origin of most spooling faults we find.
- Check the track bracket lags annually with a socket wrench. If one turns by hand, the geometry has already started drifting.
- Stop using a manual slide lock if you have an opener — a lock thrown against a powered door is a fast route to a racked, twisted door and a stripped drive gear.
- Have the cables inspected when the springs are replaced — cables and springs age together, and the moment tension is off the shaft is the cheapest time to look at both.
- Act on a tilt the week you see it — an inch of skew is a cable adjustment. An inch of skew ignored for a month is usually cables, rollers and track.
Where this sits in the sequence
This is the middle stage of the most common failure chain on a residential door — and it's the last stage where the repair is still small. Each step here genuinely causes the next.
Plenty of doors arrive at this stage without a spring failure — a cable can jump a groove on a perfectly healthy door. But once a door is here, the two steps that follow are the same either way.
How we put a door back to square
Squaring a door means restoring equal cable take-up on both sides, and that has to happen with the spring tension under control from the first move to the last.
- Measure the actual out-of-square at the bottom edge and at the top, to establish where the twist lives
- Bring the spring tension under control before any cable or drum is disturbed
- Unwind and re-lay both cables into their drum grooves in a proper single layer
- Re-clock both drums to matched positions on the shaft and re-seat the set screws into sound bearing surface
- Inspect both cables full length for crushing and broken strands from the overwrap, and replace in pairs if either is compromised
- Check the shaft for run-out and the center and end bearings for play
- Check every hinge for the permanent set that racking leaves behind
- Confirm both vertical tracks are plumb and correctly spaced from the door
- Re-tension and balance the door so it holds position anywhere in its travel
- Cycle under power and re-run the safety reversal test the way UL 325 requires
You'll get a written quote before any work starts.
When you want it handled rather than diagnosed, this is the page for it: garage door cable repair. Depending on what you find, off-track garage door repair may be the closer fit.
What moves the number on this one
Squaring a door is a labor-led job. What changes the total is how much hardware the skew has already damaged.
- Whether the cables can be reused A cable that has been crushed between its own wraps has damaged strands. Those get replaced, and cables are replaced in pairs so both sides have matched condition.
- Drum condition Grooves that have been worn or burred by a cable riding out of them won't hold a cable properly afterward. A worn drum has to go.
- Whether the counterbalance is intact If a broken spring is why the door has been racking, the spring work is the main job and the squaring is part of it.
- How many cycles it ran crooked Hinges take permanent set, rollers wear their stems oval, and end stiles can rack. A door caught the same week is mostly labor.
- Whether the track needs re-anchoring Lags that have pulled out of the jamb need fresh material to bite into before the geometry will hold, and that's extra work at the opening rather than at the shaft. It's the one thing that reliably adds time at the opening to a garage door cable repair.
- Roller condition on the side that was fighting The rollers on the binding side take the brunt. They're inexpensive individually and usually replaced as a set.
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.
Due for a check-up while we’re out? Our full tune-up is $39.99 — same price in every city we serve.
Questions we get asked about this
Because the two lift cables are no longer taking up in step with each other, or because one side of the door is physically being held back. The usual causes are a cable that has climbed out of its drum grooves, a drum that has slipped on the shaft, or a jammed roller, failed hinge or engaged lock restraining one end. It is a lifting-system problem, not a door-panel problem.
No, and this is the most common misunderstanding we run into. On a two-spring torsion door, both springs are mounted on the same shaft and turn together — they cannot act independently. When a spring breaks, the door loses counterbalance evenly and gets heavy across its full width. It does not sag at one end. A tilt points at cables, drums, or a bind.
The parts that would need adjusting — cables, drums, bottom brackets — all sit under the tension the springs hold. Even the simple-sounding version, tightening a drum set screw, means releasing a drum from the shaft while that tension is live. There's no version of this that's a wrench-and-ladder job, which is why the page stops at explaining rather than instructing.
Any visible tilt during travel is worth stopping over. As a rough working line, measure bottom edge to floor at both ends with the door partway down — more than about an inch of difference means the door is genuinely out of square rather than sitting on uneven concrete. Below that, still worth a look, because it grows.
We'd stop. A skewed door drives its rollers into the side of the track channel on every cycle, works the hinge fixings, and lets the misbehaving cable travel further out of position. It'll keep working for a while, and then it stops working in a way that involves a wedged door. The window between those two states isn't predictable.
Check whether the door travels square first. If it does and the gap only appears when the door's fully closed, the floor is uneven rather than the door — very common around the Valley with slabs that have settled. If the door is out of square while it's moving, that's the cable-and-drum problem this page is about, and it's urgent.
It gets to the same destination every time: a cable comes fully off its drum, one bottom corner loses support, and a roller climbs out of the channel. That's an off-track door, which is a substantially bigger repair than the cable adjustment it started as. The chain from tilt to off track is usually measured in cycles rather than months.
Usually a cable riding on the wrong diameter on its drum. Winding on and unwinding aren't symmetrical when a cable has overwrapped — the door can climb unevenly and then settle back square under its own weight on the way down. It's a real fault even though it self-corrects at the bottom.
Almost always fixed. Cables, drums, rollers and hinges are all replaceable parts, and a door caught early usually needs some subset of those plus the labor to re-square it. Replacement enters the conversation only when the sections have racked hard enough to take permanent damage, which takes a good while of running it crooked.
Sudden is different from gradual. Overnight usually means a discrete event — the door landed on something and a cable jumped a groove, a hinge let go, or the counterbalance failed and the last cycle was driven entirely by the opener. Look for the object it hit and look at the spring coil for a gap. A gap in the coil points at spring work; a cable off its drum is a garage door cable repair.
No, and turning it up is actively harmful here. Force settings control how hard the opener pushes before it decides something's wrong. A crooked door genuinely is something being wrong, and increasing the force just removes the opener's ability to notice while it drives the twist harder.
Leave it wherever it is. A tilted door that's already down can stay down. One that's up is safer left up than brought down under conditions nobody can control. Unplug the opener so nothing operates it, park outside, and keep everyone out of the opening.
Where this information comes from
- DASMA Technical Data Sheet #190 — Factors Affecting Spring Cycle Life — context for counterbalance failures that leave the opener racking a door
- DASMA Technical Data Sheets (full index) — industry reference for counterbalance hardware, drums and cable practice
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 and we’ll find the soonest slot that works.
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.
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.
- 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