These hole are often covered with a plastic plug.
New sliding door wont adjust anymore.
Most sliding doors have a mechanism called an adjusting screw located at the bottom of the door ends.
If you think dirty rollers might be the culprit remove the door from the tracks and clean them with rubbing alcohol.
Then turn the screws until the frame is parallel with the jamb edge.
Turning this screw raises or lowers the roller.
From the jamb edge.
Position the door so the frame is about 1 4 in.
Standard sliding glass doors all have tracks.
Most sliding patio doors have one or two small holes at the top and bottom of the door for adjusting the roller height.
Align it in the bottom track and then tilt it up.
Adjust the new wheel.
Watch my video to see the steps i took to fix an internal sliding do.
Give the screw a clockwise turn and test to see whether the door slides easier.
To adjust a door that swings open or closed on its own it is probably because the door lining frame is out of plumb.
Does it need to be repaired.
The track acts as a guide for the door and also allows roller wheels to help the door run smoothly.
Roll the door toward the latch side jamb then turn the adjustment screws until the door is parallel with the jamb.
Try using a screwdriver to adjust the height of the rollers until the door glides easily through a full range of motion.
Clean the sliding glass door track.
This simple diy trick may solve your issues.
The bottom of the frame should be about 1 8 in.
If the door becomes even harder to open turn the screw in the opposite direction.
Reattach the head stop first otherwise it could fall out.
Adjust the door by turning the adjustment screws.
This slows down your door considerably.
Remove the plug and use a screwdriver to tighten and loosen the roller height making very small adjustments and testing each time.