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1. Debris in the track problems. sand, rocks, hairballs etc. can effect the smooth rolling nature of the designed plan. This debris can cause the "wheel" to wear of become jammed. In extreme cases I have seen jammed wheels wear through because they no longer rolled. The simple addition of a
2. poorly adjusted wheels. Most sliders have a screw adjustment that can alter the position of the wheels in relationship to the door bottom Wheels that are set to low may cause the bottom of the door to drag in the frame.
3. header compression. This problem has more to due with the home than just the door. Last week I had to perform some pretty complex surgery to a door in a log home due to this compression. A jack was required to lift the center of the door way up to allow removal of the door. The wheels and track were fine..it was just being compressed. Here I trimmed off about 1/8 to 1/4 " off the top of the door (wood interior aluminum clad exterior) and reinstalled. To remove this door a wood trim strip needed to be removed rather than the "door lift" trick. Additional with this door a piece of weather strip had come loose along the bottom,and was causing some drag. this was reset with some trim screws.
Once these repairs are made the door can be moved with just 1 finger.