Ah Ha! You do not have a two stage clutch. You have 2 clutches. The PTO clutch, as you know works off the lever(s) on the left hand side of the operator's seat (if its anything like the 4 WD versions). PUSH THE CLUTCH ALL THE WAY IN AND TRY IT. Better still, engage your PTO, have someone watch its rotation and push the clutch all the way in. Let us know if it stops when you go all the way down. BobG in VA