Our sliding glass door to the backyard has become more difficult to open and I'm wondering what can be done, if some type of lubricant is supposed to be used or does it need some repair to the metal track or the door itself. Any suggestions/resources are appreciated.

caibuadday

did you check to make sure it haven't jump outof the track or 1 of the wheels isn't missing

Dr D

First check the condition and alignment of the rollers as the previous posts have suggested. If all is in order, try this, even if it seems goofy. PAM cooking spray on the rollers/track. Prior to this, blow/vacuum any crud from the rollers/track, and maybe use some WD-40 to loosen crusted crud. I realize that the PAM may attract and hold dirt, but regular cleaning and lubrication might work. My patio door that required much effort to move, now slides with one finger. Try it, you have nothing to lose.