What Causes a Garage Door to Close Unevenly? How to Fix?

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Fixing an uneven garage door will involve a little troubleshooting to pinpoint the problem, followed by the necessary repairs or adjustments. Here is the basic process:

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Troubleshooting and Identifying the Problem

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The first step is observing the door in action to determine what is making it close unevenly. Here are some things to look for:

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• Which side of the door is sagging or sticking? This will indicate which components could be faulty.
• Are the torsion springs symmetrical and moving together? If not, one may be broken.
• Do the cables appear intact on both sides? Check for frayed or broken cables.
• Are the rollers making contact with the tracks evenly on both sides? Misaligned rollers will be obvious.

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Once you’ve identified the likely cause, you can move forward with the repairs. The following sections walk through the steps for the most common fixes.

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Replacing the Garage Door Cable

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If inspection revealed a broken cable, you’ll need to replace it. Make sure the door is fully closed before starting work. Then:

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• Disconnect the opener by pulling the manual release cord. The door should stay closed when disengaged.
• Clamp locking pliers onto the broken cable below the winding assembly. This secures the cable while changing it.
• Detach the crimped terminals at both ends of the cable. They are held by screws or bolts.
• Thread the new cable through the openings and reattach the terminals at both ends.
• Remove the locking pliers and cycle the door manually to test for smooth operation.

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Adjusting the Garage Door Opener

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If you suspect the opener is unbalanced, you’ll need to loosen components and readjust. Start by:

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• Disengaging the opener by pulling the manual release cord.
• Examining the mounting brackets on the ceiling that hold the motor unit. Look for loose lag bolts or any cracks/damage.
• Tightening any loose bolts securely. Or replace damaged brackets if needed.
• Check the rail the opener travels on for level and secure mounting. Adjust if needed.
• Engage the opener and run the door through a full cycle. The motor assembly should glide smoothly and evenly without sagging to one side. Make any additional adjustments needed.

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Repairing or Replacing the Torsion Spring

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Torsion springs should be checked by a professional technician for replacement. However, you can attempt to adjust spring tension on your own:

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• Disengage the opener and carefully clamp vise grips onto the torsion shaft to lock it in place.
• Examine the coils of each spring as the door rests in the closed position. If coils appear to be sticking unevenly, the spring is likely broken.
• For springs that appear intact, carefully mark the shafts on either side at the precise point the coils stop rotating. This marks the door’s resting point.
• For the spring on the sagging side, tighten the set screws on the winding cone by 1/4 turn. Then re-engage the opener to test door travel. Repeat until even closure is achieved.

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Replacing Worn-out or Misaligned Rollers

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With the door fully closed, check the following for each roller on both sides:

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• Spin the roller with your hand to ensure it rotates freely without wobbling. If not, remove the roller and replace it with a new one.
• Make sure the roller spins in the track without excessive side-to-side movement. If not, the track may need realignment.
• Examine the track brackets holding the roller axles. Tighten any loose screws to prevent roller misalignment.

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With any necessary roller replacements or track adjustments made, run the door through a full cycle to confirm smooth and even operation throughout.

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It can definitely be annoying dealing with a garage door that just won't close right. But in most cases, identifying the underlying problem and making a few repairs is all it takes to get things working properly again.

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The most common causes - broken cables, unbalanced openers, faulty springs, and worn rollers - can all be fixed with a little mechanical knowledge and DIY spirit. Just be sure to exercise caution and disengage the opener before working near the heavy door components.

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If the needed repairs seem beyond your skill level, don't risk injury or damage by taking on a finicky garage door yourself. Consulting a professional garage door technician in Phoenix is your best bet to get things realigned and closing smoothly once again. But whether DIY or pro, we hope this overview gives you a better understanding of what causes uneven garage door closure and how to fix it.

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