Remove the door from the track.
How to fix broken plastic track on sliding glass door.
Built up dirt or loose debris can cause a door to stop sliding and ride off the track.
With the wheel raised pull the corner of the frame out of the track.
First locate the roller adjustment screws and use a screwdriver to turn the screws counterclockwise.
The screw heads should be higher than the height of the original track.
Raise it just enough to clear the track and roll smoothly.
Open the door about half way lift it straight up and pull the bottom toward yourself until it is free of the track.
Lift one wheel off the screen door track using your finger or a screwdriver.
Then using screws with a thread diameter no larger than the width of the original track partially screw them securely equally spaced in a line from one side of the break to the other.
Do the same at the other corner and then remove the door by pulling it down and out of the upper track.
If a malfunctioning sliding door is a chronic problem see if the track is dirty.
First brush and wipe clean the broken area to be repaired.
Use a wire brush to clean off the dirt or debris.
Then remove the door stop at the top of the frame which should be as simple as unscrewing it.
Here s how you can clean the rollers and the track.
Locate the two adjusting screws at the bottom of the door on the face or edge of the door and pry off the trim caps that cover the screws.
The corners and the area where the track borders the door jamb will require the most attention.
Remove the door from the track.
Completely open your sliding patio door.
Take the flat head screwdriver and insert it into the track channel using it to loosen any dirt or debris that may be present.
This will retract the rollers and make the door flush with the track.