In this video we discuss how to repair the lifting mechanism on a coleman Niagara popup camper. Many times the crank handle stops working and we show you how to disassemble the camper and fix the lifting operation.
source
Coleman – How to Repair Pop Up Camper Roof Lifting Issues

Thanks for this video I'm having a similar issue and this is the only video I've found explaining the mechanisms in play.
The stuff is incredibly exciting.