Lay plastic sheeting over the threshold in the doorway and coat the top side with petroleum jelly. This will protect the threshold from scratching as well as make it easier to slide the door into the center of the opening.
Lift up on the handle and slowly pull the pocket door out of the recess. Ask someone to lend you a hand, if necessary.
Wipe down the rail at the top of the doorway with a rag, removing the old grease on the track.
Fold the plastic sheeting up to cover the petroleum jelly and place wood shims over the threshold. Pick up the pocket door and set the rollers back onto the overhead track.
Carefully pull the wood shims out of the threshold, as well as the plastic sheeting, letting the door hang from the track.
Coat the rail track with lithium grease, which you can purchase at auto parts retailers. This will allow the door rollers to glide over the track with ease.