Update,
I disassembled the drawbar and found many broken washers and some bite marks on the drawbar itself (See picture). The bite marks are only about .001 - .002 deep.
I have some new washers on order, and have polished out the bite marks on the drawbar. I am going to coat the washers with Never Seez, see link Bostik Regular Grade Products - Industrial Supply Group This looks like good stuff to keep the washers happy, please let me know if I should be using something different?
When complete, I am hopping the air cylinder can push the drawbar down at 80 pounds.
Thanks, Bryan