How old is the case feeder? If more than just a few years, then it is possible it has the problem I had on mine. The motor simply refused to spin. Given the price of a new motor, I took the old gearbox apart, and sure enough, the first gear was plastic, not metal. With time and lube the plastic had become swollen, and it would not spin freely on its shaft. Carefully opening up the hole with a right size drill did the trick, and the hopper has been running perfect for over a year now. I think I had to drill out the rivets in order to take the gearbox apart, so I then tapped the holes for screws. The motor for some reason is not covered by warranty.
The case feeder is less than six months old. So the motor is not covered under warranty, I wonder why that is?