I have a Mitsubishi MTE 2000D. Everything was fine until today while mowing a field I hit a 50 pound rock that wasn't there last year. Someone put it there to mark something I guess. I was swinging a 60" brush hog and broke the rock into three pieces. I stopped and picked up the pieces and started mowing again. Then 20 feet later there was a breaking metallic sound and the mower stopped rotating. Looking down I saw oil coming out from the bottom of the pto shaft where it exits the transmission. The output shaft is all floppy. I managed to get the mower off and the tractor back in the barn. I am wondering if anyone knows what my next step should be and what may have broken. I am guessing I will have to go into the transmission. There are 4 large bolts on the plate that is around the shaft where it exits the transmission. Could it maybe be as simple as removing the plate would allow access for repair? Any and all suggestions are welcome. I am a fair mechanic, enough to know to not just start ripping and tearing into it without knowing where I am going with it. Help?