Ok, guys, I have the diagnosis....a small "pin" that keeps the shaft coming off the engine and the shaft that goes to the hyd. pump together (like a u-joint) either sheared off or came out. The dealer removed the floorboard and was able to show me where the problem was. A C-clip holds the pin in, and they had already replaced everything, so I wasn't able to see if the C-clip had come off which would have allowed the pin to come out of it's hole. The shafts are not splined, so the pin is the only thing keeping everything together.
Ralph, you were pretty much on the money. Where the middle shaft (located under the operators feet) meets the hyd. system the shaft is splined, but not at the engine connection. Two smooth shafts held together by a pin.
I hope this made sense. If they give me any more technical information I'll pass that along, too. They are putting everything back together, so hopefully I'll get her back soon. I noticed about 10 huge machines in the service bay. My 4010 looked like a pushmower next to them.
