After you have taking out the wheel you can then go to the hardware store to buy another one.
How to change wheels on sliding door.
In this video we show you how to replace a roller in a patio sliding glass door.
Insert the rollers into the door.
Dismount the lower part of the frame from the sliding door.
Make sure that the wheels are facing down towards the bottom of the door.
Place a wooden block against the bottom frame on the sliding door.
Insert the screws and turn them clockwise until they are tight.
Locate two screws and use a screw driver to remove them from the frame.
Pry the original door rollers from the bottom of the door with a.
Screw the new rollers into the bottom of the door.
At the bottom of the sliding door use a screw driver to push up the wheels and slide them in to the frame.
Tap the block with a rubber mallet to release the frame.
Make sure you bring along the broken one so that you could compare it and got the right side.
The side with the holes or countersink screws should line up with the holes on the door.