I “borrowed” the cover from my freebie for you D2; I couldn’t help notice all of the stray chunks in the bowels of this poor old thing. I don’t seem to see where all of the broken bits came from. I will remove everything with a magnet and look harder with a bright light. It came to me for parts and will likely be a parts machine.
Gee- looks like someone might have heard some noise from the looks of the bottom of that case. Those "chunks" look pretty heavy, more like a gear went south! Bearing cage or casting broken? Pictures and let us know what you discover.
PTO shaft coupling blew apart because previous owner didn't have an overrun clutch when connected to a brush hog that stopped abruptly ?
Side-seat: I do not believe that this D2 had a PTO at any given time. The mention of an override clutch is a very good statement, as some folks have wanted to use their machines for pulling choppers, etc. there could be terrible damage without one. I might open it up and take a peek some more, as the presence of metal is disturbing. It steers and rolls without issue. So far it has been great as a parts machine. JM