keep in mind the windows are made by someone other than coachmen. Can you identify the manufacturer of the actual window? It might help in troubleshooting them. I have not seen crank out windows on the Coachmen line I own, but I believe some other lines have them. I recall reading about how to dissemble the geared crank. perhaps search in the general tech area here on the forum.
2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.