Reinstalling sliding bypass doors the doors are usually interchangeable but you will want to start with the rear track.
Fix sliding wooden door off track.
To replace torn or cracked weatherstripping where the sliding and fixed panels overlap loosen its staples with a flathead screwdriver then grab one end and pull it and the staples off the door prying gently with a putty knife.
Remove any remaining staples with pliers.
Use the blade of an old screwdriver to pry stubborn dirt loose.
Locate the two adjusting screws at the bottom of the door on the face or edge of the door and pry off the trim caps that cover the screws.
Sink the broken ones with a hammer.
Don t worry it ll be the only screw you see there.
To clean and lubricate the hardware of a sliding closet door use a stiff brush a toothbrush or a hand vacuum to clean dust from the tracks.
Insert the door s wheels into the double track inside the upper door jamb lifting it as far as it will go.
Bring the door to within a few inches of the strike side jamb.
Using a screwdriver you can just adjust the mounting screw.
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If the rollers are damaged install replacement rollers available at home centers.
You can then fix the problem of your closet doors jumping off their track.
Work the door slowly into the opening in this manner.
If the door still sticks turn both screws a quarter turn to raise the whole door.
If a malfunctioning sliding door is a chronic problem see if the track is dirty.
Afterwards place another block of wood onto the track perpendicular to the first block and use a hammer to hit the top of the second piece of wood.
Use a wire brush to clean off the dirt or debris.
Straighten the track with a block of wood if it s bent.
Try holding your foot against the bottom of the door and pull gently on the top of the door to lift the back side.
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If you notice the track is uneven with the floor place a block of wood into the left or right side of the track parallel to the its direction.
Moving the door when the back side is sliding on the ground is a little difficult.
If one side looks lower raise it until the door looks even on the track photo 1.
Angle the bottom of the door toward you while you let it down and the wheels should hook right onto the track.
Use an aerosol lubricant to lubricate all the door rollers.
Built up dirt or loose debris can cause a door to stop sliding and ride off the track.