I was thinking a small starter motor, or a hydraulic motor, and a chain drive. Wiper motor might work though.Mine uses like a wiper motor and an open worm gear for chute rotation, and a linear actuator for angling the exit chute. Pretty slow when you have to go from "full left" to "full right," but it works.
I know, I got lucky!$1800 is amazing!, new here or right around $5k. I paid $2700 2 years ago for a used one.