Study the Operators manual.  They do work different than the more usual roll bar or wheel rake. When set up just about anyone can run the machine. Though I still advocate putting the best operator on the rake, regardless of type.

My first rotary rake was a single system. It could be adjusted in height, for pitch using the top link as well as RPM's. I now use a double machine designed to rake to the center or as a tedder.

My original one had a curtain to rake against. I found if the RPM was right I did not need the  curtain.  The manufacturer claimed up to 10 feet working width, but that included the curtain. In fact the teeth operated on 7 feet of hay. The company sent me a questionier and I told them they lied.  Got back some kind of dumb answer.