I usually repair them with a mill finish bottom track such as the one shown on my patio door screen tracks page.
Patio screen door off track.
Lift the wheel out of the screen door track.
Lift one wheel off the screen door track using your finger or a screwdriver.
Remove the screen door from the frame by grasping it on both sides and lifting the rollers off the lower track.
A sliding glass door glides back and forth along a track.
Do the same at the other corner and then remove the door by pulling it down and out of the upper track.
Although there is more than one design for sliding patio screen doors the most common one employs a pair of rollers on the bottom of the door that fit on a track on the bottom of the frame.
Kung fu maintenance demonstrates how to replace some wheels that are not rolling right on a patio slider door that is coming out of it s track and not rollin.
How to fix a screen door that s off its rollers.
The door should slide right out of the top track once you ve freed it from the bottom track.
Remove the door by pulling it out of the top track of the door frame.
Instead these wheels ride the track.
Sounds like this is a vinyl patio door with a vinyl screen door track.
With the wheel raised pull the corner of the frame out of the track.
Prime line d 1655 sliding screen door track 6 aluminum anodized pack of 1.
Angle the bottom toward you and lift it a little further to disengage the runners on the upper track then pull it out of the doorway.
When you open or close the door it doesn t actually slide.