Whatever lubricant you use, make sure you clean the tracks first and then try the door. You may not need any lubricant.There are instructions here: How to Clean and Lubricate a Sliding Glass Door There's a long thread on the subject of the lubricant itself on Google Groups. The suggestions range from silicone spray to nothing. You probably do not want something that's going to dry up, attract and stick to crud, or get gummy over time.Edit: here's some door and window lubricant you might try. (I haven't tried it yet.) LUBRICANT BOTTLE WITH APPLICATOR Vacuum the track to your door while it is closed.Slide the door all the way open to access other side of the track.Scrape out the dirt and debris from the track using a flat blade screwdriver.Vacuum the loosened dirt using an attachment with a narrow tip.Use an old rag to apply generous amounts of a non-stick silicone lubricant to both tracks of the sliding door.Slide the door open and shut several times so that the entire track gets lubricated.

Sources: How to Clean and Lubricate a Sliding Glass Door, Retractable Screens for All Styles of Doors & WindowsFirst of all, it should never be necessary to lubricate the top track. It the door is rubbing the top track, then you have larger problems than you can/want to handle yourself. Replacing the rollers (roller assemblies) might cure your problem, but as Mr. Streiff advised, " You do not own the property and its maintenance and upkeep is the landlord's responsibility". If the landlord is unwilling to fix the problem, suggest to her that you will fix it if she will deduct the cost from your rent. Then get it in writing, even it is just an e-mail. But before going that far, try adjusting the roller assemblies at each end of the door. Most sliding glass doors are adjustable, as it is common for the wheels to wear down, and the door to drag on the bottom of the track. Turn the adjusting screw so that the wheel comes down and the door rises. Use graphite on the wheels. I do not recommend anything else.

There are a couple of 'dry' lubricants, on the market, but I have not had enough feedback/experience with them to be sold on their use. If you must replace the wheels/wheel assembly, then you need to remove them and take the best looking one to your local hardware department. There are many different styles and sizes, so you will need to match the old one to be sure of a proper fit. Sometimes, you can get away with just replacing the wheels. If you cannot tell if you have the kind that allows just the replacing of the wheel, ask the salesman. If neither of you are sure, buy the entire assembly. The price difference is usually not that much. I, personally, have always replaced the entire assembly. If the wheel is worn that bad, I know that the wheel frame is the same age, with same amount of wear. Why take the chance of having to open her back up again in a few months to replace the rest of the thing. FREE SHIPPINGon orders over $50. Dog and cat doors give you and your pet more independence.

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