Did you ever get your tractor running again? I assume so, my 1840 had a slipping PTO and it resulted in a new clutch pack, but the cause was a bracket on the internal hydraulic line to the PTO piston had chaffed and worn a large hole in it so PTO piston was not getting full pressure. New hydraulic line no longer has the bracket so unlikely to reoccur in my lifetime. Apparently this issue was common in the 1840/2440 machines.