One unit is the door that you slide and the other unit is stationary.
How to change rollers on sliding glass patio door.
Place the screen doors safely off to the side until you are ready to put them back.
1 your patio glass door will have two separate glass units.
How to replace the rollers on your patio door.
Remove the screen door if you have one.
How to replace the roller assemblies in a glass sliding door i made this video because i needed to replace the slide rollers in my 10 year old glass sliding.
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.
Grasp both sides of the frame and lift the door up off of its tracks.