81 Ford L8000 clutch adjustment

Went to fire up The old Ford dump truck today, ran great as always but when I moved it I noticed the clutch was releasing right near the top.

Too many people learning to drive a big truck around here but that's the way it tends to be on a farm.

Anyways I have adjusted more clutches than I can count over the years and they all have been the remove the lock arm and turn the ring style or the push in and turn bolt style.

This one has me puzzled I have not seen one like it before and I could not find one like it in my heavy truck books going back to the 60's.
It is a dual disc clutch behind a Cat 3208 with a 13 speed tranny.

There is no lock bar nor is there a push and turn bolt on it.
What it does have is 3 spots that have a lock plate held on with a couple of 5/16 bolts, protruding through the center is a nut with maybe 1/4 - 1/2 inch of threads sticking out, the nut takes a 13/16 wrench.
I blocked the pedal down then turned the engine over to access each of these nuts one at a time.
First I tried tightening the nuts 1/2 turn each, this made things worse.
Next I backed off each of them the initial 1/2 turn plus an additional 3/4 turn.
Tried it and the pedal is now releasing about mid stroke, good enough for what it is.
Likely what I was adjusting was the release finger pivots so even though I did my best to turn them all equally I can't help but think these should probably be set with a feeler gauge with the clutch released for a proper setting.

If anybody out there is familiar with this set up and is is willing to share some tips or knowledge it would be greatly appreciated.

I had a F800 13 speed and a 3208T. I
think we adjusted the clevis going to the
throw out bearing. My Dad drove it he
started in a low gear and never used the
clutch again. A clutch would last him
forever. We did get a new engine under
warranty.

I found a clutch according to your description in Motor's Truck and Diesel Service Manual, 26th Edition. There were several models of Lipe clutches, and none of them had an adjusting ring. The adjustments you describe were intended to be set up on a bench before the clutch was installed. That leads me to believe that the only adjustment was through the release linkage like a regular 1-ton truck (before hydraulics became common). Sounds like you did O K anyway, and if the clutch isn't chattering you must have gotten them all pretty even.

Look up by the throw bearing-see if there are a couple of jam nuts that can be turned by a hammer and a long chisel.One will be the lock nut and the other is the adjustment.It moves the throw out bearing in or out for free play adjustment.There ought to be about 1/8" between the fork and the bearing.You have to hold the pedal down while adjusting.Mark