Dismantle sliding glass shower door

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.

My sliding glass door to the patio, after your lock it and check it, moves a little bit to the left. It is still locked, but it moves. Is this normal and safe?

I need basic instructions for installing a sliding glass door. Irene

We have a sliding glass door that leaks when it rains heavily. Our house is 18 years old and the door leads out to a wooden deck. The deck is about one inch below the the door frame. It is a good quality wooden door manufactured by Peachtree. This has caused some damage to our hardwood flooring...

I just installed a laminate floor in a kitchen on top of an inch and one half sub floor. The bottom of our Andersen vinyl clad sliding glass door barely clears the floor and this without any threshold. The door wheels are set at their highest position and the top of the door rubs against...