Flat out, I don't know. I have read here from time to time that a pin would shear and cause your problem.
Since the hand crank doesn't work I'd look on the shaft for the problem.
I may be totally wrong with my answer but I did notice your question was posed last night and it was your first post and I didn't want you to think we are some kind of clique bunch of RV owners.
2013 Voltage 3800, 2012 Chevy 3500 HD
2010 Yamaha V Star 950
2009 Yamaha Raider
Volunteering with Habitat for Humanity Caravanners