Having the same problem and have parts on order. On mine the assembly where the shaft is visible has four screws on a cover plate. I removed the four screws and found that one of the gears had broken. Just ordered a new gear for $35. Hopefully it will fit as the only other option for my system is to replace the whole assembly for roughly $700
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor PDQ40
2014 Ford Explorer toad