Sliding patio doors are convenient and provide spacious access to the patio as well as allow plenty of sunlight into your home. The sliding panel should operate smoothly with little effort. Patio doors use two rollers on the bottom edge of the door to effortlessly glide the door up and down the lower track. When the door binds or otherwise becomes a bit difficult to operate, it may be necessary to make a minor adjustment to the patio door roller height.
Operate the door to see where it is binding, and if it is a roller adjustment, or if there is a bent track. If the top of the door is binding and the track is straight, the door panel needs lowering. A door that binds or rubs the bottom track requires raising.
Open the patio door halfway so you can access both sides at the same time. Look for two adjustment holes either on the lower edges of the door or on the inside lower rail of the door. Some doors use circular caps to hide the adjustment screw. Pry the caps off with a utility knife.
Insert a flathead screwdriver into the adjustment hole and onto the head of the adjustment screw. Turn the screw 1/4 turn clockwise to raise the door panel or counterclockwise to lower the panel. Repeat for the opposite roller.
Slide the patio door open and closed and continue making adjustments as necessary to the roller height. The door roller is adjusted when the door glides freely across the opening. Push the caps over the adjustment holes when adjustments are complete.
If the door still does not operate freely after adjusting the rollers and the track is not bent, it is necessary to replace the rollers.