pic: ABS-114, supercompact planetary PTO shifter

[asid61]

Originally Posted by GeeTwo

So that thing that looks in the render like a round disk between the ring gear and the 64-tooth gear is actually a #25 sprocket? This would certainly be convenient in that PTO could be geared up or down by a factor of about 2 through selection of a PTO receptor sprocket.

The round disk is a hub for the #25 sprocket, which is hidden behind it in the render. The GrabCAD model should clear it up.
You can use pretty much any sprocket with a versakey pattern as long as it's not large enough to hit the standoffs.