Release the garage door from the power opener by pulling on the attached release rope.
Changing garage door rollers on youtube.
Some people actually try to remove the entire garage door and this.
This video shows the simple steps to replace a garage door roller.
For added safety unplug the garage door opener from the outlet.
To see if your rollers need replacing inspect each of the rollers by watching them as they go up and down the track.
This job can be done in about 5 minutes.
Place a clamp on to the track about 2 3 of the way up the door opening.
If your garage door seems to get stuck or is jerky it may need a new garage door roller.
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Start by opening your garage door completely.
How to replace garage door rollers instructions.
If one or more are not rolling and or appear damaged it should be replaced.
Change the bottom roller at your own risk.
Find new rollers and hinges here.
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A how to video on changing garage door rollers.