Update: Tried troublshooting the valves, and while there was a slightly sticky main spool on the PTO valve I didn't find anything unusual. Didn't have a proper gage to check pressure, so I ordered one, and in the meantime just stuck an air hose on the pressure inlet at the front of the shaft. Could hear a huge leak within, so pulled the clutch out.
Wasn't too bad a job getting it out. Extracting the two dowel pins were the worst part.
With it on the bench, the two O-rings on the shaft surrounding the inlet hole into the clutch housing are in bad shape. I suspect this is the majority of the issue as the teflon piston seals look pretty good. Probably will test on the bench with new O-rings since they are the easy and replacable items. If teflon leaks, will have to start looking for a source for these...
Found some smashed parts of a snap ring at the bottom of the splines in the clutch housing. Its not shown on the parts breakdown and probably considered part of the housing. (photo of internal splines, that gap at the bottom had the snap ring)
The book doesn't list any wear limits on the clutch discs. Any specs or thoughts on these? "Replace them while it's apart" is a good thought, but this isn't a heavily used tractor and trying not to dump more cash into it than necessary.
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