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|Brent Hand||i have a 1971(?) 680ck. much like many of the other entries on this site, i lose clucth plate pressure when the machine get warm. we rebuilt the shuttle and we still lose pressure. we replaced the pump, all seals, and the clutch discs. the clutch discs were down to the metal. all that is left that contains pressure in the shuttle is the valve body and the torque. any ideas??? whoever AJ is i would like to chat with you. we know the 680ck like the back of our hand and we cannot figure this one out.