If it is still not closing correctly secure the door again and keep adjusting the spring until your door fully closes.
How to adjust garage roller door spring.
Once the spring is free of tension remove from its track hanger.
Close the garage door and disconnect your garage door opener.
After adjusting your spring unclamp the door and lower it to test the spring.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
For more advice like how to adjust your garage door s torsion springs read on.
You must release the tension on the garage door springs before attempting adjustment or replacement.
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One end of the spring is connected to the garage door track or frame.
Here are the steps to adjust common torsion spring mechanisms.
To decrease tension move the hook to a higher hole.
If you need to increase the spring tension hook the spring onto a lower hole on the track hanger.
Detach the old spring from both ends and replace it with the new one and replace the pulleys as well if they are worn out.
Hold the garage door in this position by attaching a c clamp to the track at a point below the lowest door roller wheel.
Clamp the garage door in place with a c clamp above the bottom roller.
Adjust the spring into the proper position and make sure your garage door closes all of the way.
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The other is attached to a pulley connected to the cable.
Retest the door.
If it was opening too quickly move it to the next lower hole.