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