Hello, Dolly...... treadles are vintage so I would suggest that you post over on the vintage site. I have a treadle that was froze up and I was able to get it working with help from the vintage guys and gals over there.
The most common problems I see are the belts missing and parts being froze up from sitting too long. Also, they can get clogged with lint and have difficulty moving. There is a cleaning post on the vintage site that might help you as well.
I would certainly take along some tri-flow oil for the machines.
Good luck