[murf]

All of those motor tuning systems have limit switches at the ends of the dial travel, to cause the motor to reverse and hunt the other way. You'll need to look for them and use contact cleaner, such as De-Oxit., and get the contacts working again.

I have some of those RCA tuners on sets in my collection, but one is not easy to get at and look at just now. The service notes in the RCA red books, if you have access to one, will be a big help.

Will look for the switches Doug.
Thanks
murf