1 your patio glass door will have two separate glass units.
How to change rollers on sliding glass patio door.
Replace the roller screws and use your phillips screwdriver to turn them clockwise until tight.
2 you may need to create more room when you attempt to remove the sliding unit from the door frame.
Make sure the rollers spin sufficiently before re installing your sliding glass door.
Insert the new rollers in the door lining up the holes on the rollers with the holes in the bottom of the door insert the new rollers in place.
First lift the rollers off the track by sliding a flat head screwdriver or putty knife under the roller and pushing up.
How to replace the rollers on your patio door.
Remove the screen door if you have one.
Grasp both sides of the frame and lift the door up off of its tracks.