I have a Kubota l4300DT that was at an idle and all of a sudden it had a terrible clatter noise in it so I shut it off immediately. After that when I grabbed the PTO output shaft it would spin freely for a half a turn and then stop with a clunk. I have drained all of the oil from the motor looking for metal and the transmission as well. There were very few flakes of metal from the transmission but I didn't see anything in the motor oil. I have split the tractor behind the clutch case and have gotten access to the PTO clutch and everything looks fine. Where do I go from here?