The JD850 went back together more easily that I expected--twice! I'll get to that in a sec, but first let me mention the bushing in the throwout bearing assembly.
When I inspected the hole in the middle of that throwout bearing assembly (two springs hold it in place) I could see that the brass bushing inside it was worn to one side (about 8 o'clock) on the end facing the clutch all the way through and into the steel at the outer edge. I got the part number from JD for the bushing and that is CH-13095. I had trouble finding the parts for the dual clutch plates and throwout bearing (as mentioned before) and got them from Southern Global. Nobody seemed to carry the bushing for the dual clutch. I finally found one in an open box, but original JD part for $25 with $4 shipping on E-bay. It took nearly a week and a half to get here USPS--so that was extremely disgruntling. When I opened the box and saw the length of the bushing it became obvious to me that it wasn't long enough. Upon close inspection I discovered that there isn't one CH-13095 in the assembly but rather there are two in there, one at each end with a small gap between them. I drove out the one that was worn through and replaced it with the new one. On the other end, as the bushing was worn in an oblong fashion, I removed the old bushing, turned it 180 degrees, and put it back in the assembly with the thick remaining edge now facing the area most worn before--I was not about to waste another two weeks waiting on a bushing if I even could find another one.
That all went fine and is re-installed. Then I took the clutch finger aligning tool that I made from a pasta box to the specs provided on that diagram provided on another forum post and checked the position of those bolts (that meet up with the throwout bearing). These were 1/4 inch too short. I wondered about messing with the setting on them and taking them to the pasta box tool setting. But, as this is the way they came from the factory and I figured they were all even and I could adjust with the clutch pedal adjustment outside the tractor. I got the two sections of tractor back together again and found that I did not have enough adjustment in the clutch adjustment rod--it was too short.
So split the tractor again I did. Also worth mentioning here is a video I found on Youtube with a guy putting a clutch in a JD950--same clutch. He did not want to buy the adjustment tool from JD for $100 so he talked to a local mechanic who told him to just set the clutch finger adjustment bolts so that the threaded ends all are even with the backside of the finger tips--that this makes them all even and is close enough. I did this and that was the perfect 1/4 inch I needed to get the spaghetti box alignment tool to touch the flywheel and the clutch finger bolt tips. Why they were off from the factory that much I do not understand, but it seems to be the ticket here.
I now have the beast back together--again, I did not have the shaft spline alignment tool, but by turning the PTO shaft with the PTO in gear I was able to align that up easily when putting it back together. Once that PTO shaft was in place, next I was able to put a socket and ratchet onto the front of the crankshaft at the harmonic balancer and turn the engine to line up the transmission shaft and complete getting the tractor back together. The clutch pedal adjustment is better, although I still am not getting it quite to the 1" range before the pedal engages that the manual suggests. But, I am about to go out and put all the stuff back onto the tractor and fire it up to see if I've got everything back in working order.
I'll report in when I know....
