Repair a sliding glass door by adjusting the fit in the frame, cleaning the track, lubricating the guide wheels, or replacing the track. Determining the reason the door does not operate smoothly helps you to know the right repair.
Some doors do not slide correctly because they are out of adjustment. Use the screws at the bottom side of each edge to adjust the roller position. For proper operation, adjust so there is a 1/8- to 1/4-inch gap at the bottom of the door. Improper adjustment is the most common reason doors do not operate correctly.
Dirt in the track prevents the guide wheels from turning correctly. With the door fully closed, clean the dirt using a wire brush. Vacuum the now loose debris. Open the door, and repeat the process with the other half of the track.
Worn guide wheels prevent easy operation of the door. Remove the door by opening it half way and lifting it out of the track. With it lifted, pull the bottom toward you, and lower the door so it clears the top. Place the door on sturdy sawhorses, and clean the wheels; use a spray lubricant to ensure easy operation. If necessary, replace the wheels.
While the door is out, examine the track. If it is damaged, install a piece of track cap. The cap provides a new guide for the door. Return the door to the track after installing the cap.