There are a few things that you can do to fix a sliding door track. First, take a look at the track and make sure that there is no debris or dirt blocking it. If there is, clean it out. Second, check to see if the wheels on the door are aligned properly. If they're not, adjust them. Third, make sure that the door is being pulled straight when you open it, and not crooked. Finally, apply some lubricant to the track if it's dry or rusty.

One way to fix a sliding door track is to use a lubricant. Another way to fix a sliding door track is to use a wax.