If one or more are not rolling and or appear damaged it should be replaced.
Changing garage door rollers on youtube.
This job can be done in about 5 minutes.
Release the garage door from the power opener by pulling on the attached release rope.
A how to video on changing garage door rollers.
Some people actually try to remove the entire garage door and this.
Change the bottom roller at your own risk.
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If your garage door seems to get stuck or is jerky it may need a new garage door roller.
Start by opening your garage door completely.
Place a clamp on to the track about 2 3 of the way up the door opening.
This video shows the simple steps to replace a garage door roller.
Find new rollers and hinges here.
Mike shows you how to change garage door rollers.
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Do not unscrew the bottom plate with the roller in it.
How to replace garage door rollers instructions.