This is the one that had the collar come loose on the top shaft of the transmission. Finally got the time to pull the transmission. It came out without a hitch. Removed the shifting fork assembly and saw the collar laying on the splash guard in the bottom. The collar is a little knicked up but none of the important surfaces got damaged. Checked all the gears - everything OK. Ordered the parts I needed yesterday - they will all be here today. I got lucky so far except for all the time involved in removing the cab,dash, battery box,floor boards,clutch levers, linkage,clutch,and transmission. Still have to access the top if the case to hook up the PTO drive when the transmission goes back in.
I will take some pictures b/4 starting the re-assembly and some more during progress.
Thanks for all your help getting this far.
Updates/pictures as available.
BullDozerBob

With the transmission sitting on the shop floor I installed the collar, shifting fork assembly,and interlock and "shifted" the transmission to see all the gears. Gears are all there but it acted like I could get 5th in reverse. Thought that couldn't happen. I might not have the interlock set right? Any ideas would be great.
Also-the books I have do not give any torque values for bolt sizes. Does anybody have that kind of Cat Chart?
Thanks
BullDozerBob

Should not be able to get two gears at once. Check interlock mechanism for worn parts, pauls, springs, etc. Also any loose, damaged or worn shift forks.
Interlock shaft needs to be in position shown in pic.

If Fifth is High Gear I think you shouldn't get it.
Not exactly sure but many don't and high gear is forward only beyond the reach of the reverser.
Later Bob

Thanks for the torque chart Old Magnet--I will file it in the never lose file.
Looking at the wear marks on the interlock pawls/shifting fork assembly it appears all are in the right place. Nothing shows extreme wear. When I "shift" the forward/reverse bar towards the front of the Cat it's in reverse isn't it?
Cause when I did that last night and put the gear shift in 5th and turned the input shaft the output shaft turned. Make sense?
BullDozerBob

Yes, forward is reverse:D
The tractor will move forward in fifth gear without the forward and reverse lever being in forward direction position but to get lube the forward/reverse lever should be in the forward direction position when operating if fifth.

$100.00 worth of parts and antifreeze and lots of time/labor and the D6 is back up and running. Nothing is leaking and short of putting the floor boards in and cab back on I'm happy with the outcome. I'll add pictures as soon as I can.
Thanks to all on the board for your assistance!
BullDozerBob

That's good news Bob.........sure didn't break you in the parts cost but yes it is a lot of work. Hope all goes well....waiting on the pictures:D