Most sliding glass doors contain two sets of rollers one on each side of the bottom of the door.
Sliding glass panel door roller.
If your glass sliding doors move in a stiff or unwieldy manner it may be time to replace the rollers on the bottom of the door.
Replacing rollers is not a difficult task but you will need to remove the door from its frame.
Installation can vary based on whether you have a vinyl or aluminum door.
I will show you how to remove the door remove the wheel rolle.
You can alter the height of these rollers by accessing the adjustment screws which are set into slots on the door s outer edges perpendicular with the rollers themselves.