Here is a couple of additional pictures of the transmission. I don't see anything else obvious. I did note that one of the &quot;gears&quot; or the backside has been worked over with a bench grinder or similiar device, it isn't a nice rounded smooth surface. 

I've also thrown in a picture of the my shop. The 88, the 1650, the 1800, and the back of the 520 baler.