The 540 PTO on my IH784 was slipping under load. I suspected it was a worn PTO clutch. I removed the PTO clutch pack which was actually very easy. I ordered a set of replacement discs from this site. I removed the old discs and installed the new ones in the PTO clutch pack. I then installed the clutch pack in the 784. It was not too terribly tough, except I did have trouble getting the roll pin reinstalled, but I eventually did. Now comes the fun part- the PTO shaft will not turn when the PTO lever is actuated. When the tractor is shut off, the PTO shaft can be turned by hand 180 degrees in each direction just like before. However once the tractor is started and idling, the PTO shaft will not move at all if the PTO lever is actuated, AND ALSO will not move at all if tried to turn by hand. Any suggestions on where I screwed up from you guys that actually know what you are doing.