I actually almost got my shop cleaned up, but at about 75% straight, I started another project. I brought in my Bush Hog ST-32 rear pto powered tiller. She is completely apart, save a couple sheet metal parts still bolted together, and the gearbox partly disassembled. I left the camera in the shop, so I'll upload pics later. The camera was acting weird, so I think the pics will be blurry. I've never seen a tiller built like this one. It has 2 sets of roller chains, one off each side of the gearbox, each driving one end of the tiller tine's shaft. The inner halves of the chain case is welded to the main frame, and the tine shaft is one piece. So with all the shaft bearings & lower sprockets rusted tight, to remove the shaft I cut it & the tine assembly right in the center. Later I will re-weld the shaft and the tine tube after pressing off the sprockets & bearings, which will surely also require lots of heat. One of the special top sprockets is shot, and being only 10 teeth in #40, it is looking like all I can find that is of size to fit to this system will be a 12 tooth. So that will have to do, and it'll possibly never see actual use anyway, so I just want it functional. Even with a 20% increase in speed, it would still be usable anyway.
I have this pic I took when I first brought it home. You can see how it has the dual chain drive. Ignore the Sears cultivator.