Adjusting Pella Sliders

Inspect the rollers and door or window track. Before attempting any adjustments, determine if the unit actually requires a manual adjustment to correct any issues. Most problems that interfere with doors and windows sliding easily is related to cleanliness around the hardware. This area naturally gathers dirt, debris and moisture through regular use.

Clean the door or window track. Vacuum the track and wipe it down with a damp cloth. If possible, open and close the window or door several times to release dirt that may have been blocked in the roller area by debris in the track. After cleaning, treat the rollers and track with a light application of a spray lubricant to decrease friction on the metal parts and deterioration of rollers.

Verify the level of the window or door to isolate the roller set that requires adjustment and the amount of adjustment. Jumping in to make trial and error adjustments to correct door issues could cause hardware to break and require replacement. Place the carpenter's level on the inside frame of the door at both the right and left sides and then again on the floor board near the track. Compare the level noted on the door to the level of the floor to determine the amount of adjustment needed on which set of roller hardware. Although the rollers may require occasional adjustment during regular use, problems may be caused by the home's foundation shifting with seasonal temperature and humidity.

Remove the roller compartment's protective caps. Within the bottom frame at each right or left side of the door or window is a small access hole to reach the roller hardware housed inside the frame. The hole is manufactured with a small plastic cap that can easily be removed.

Place the screwdriver tip into the roller screw. Start with the roller set on the side of the door or window with the greatest degree of difference found between the door and the floor. It's possible to locate the screw by feel, but if necessary, use a flashlight to look inside the hole so that you can line up the screwdriver tip with the notches in the screw.

Turn the screwdriver to raise or lower that side of the window or door. Pella notes that turning the screw clockwise will raise that side of the door, while counterclockwise will lower it. Don't make more than one complete turn of the screw without rechecking the level at both ends of the unit with the carpenter's level between rotations. If necessary, make adjustments to the other side of the door or window while further confirming the unit's level and alternating sides between each adjustment. The goal is to get the bubble in the carpenter's square centered when positioned on the frame at each side without making drastic adjustments in the roller hardware.