Dragging lower door pin

A quick learner from Virginia says:
Several of our metal bifold closet doors on our "new" house (built late 80s, I suspect the doors are original) are scraping on the bottom. One I can tell the nylon piece is broken, others I'm not sure what the problem is. Would replacing the pin help this problem? Or any other suggestions?
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Emily from SWISCO responded:

Thank you for reaching out to us. Your guide may just need to be adjusted. I would also recommend cleaning or lubricating the tracks. If the problem persists after that, let us know and we can work from there. 

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