Mike, I do the same as Dan stated.We run a powerband belt on the RH side of the feeder house.(AGCO n71174137) Usually it is an idler misalignment problem that will throw the single belts off.Usually one belt jumps off then takes the other with it.I have seen where the feeder house is only running with one belt and it is in the inside groove at the top and the outside groove at the bottom.Again,alignment is crucial and sometimes the idlers have grooves wore in them.Usually by replacing with a powerband belt and some realignment of the idlers will solve your problem. Good luck, Hyper Harvest II