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.

Click image for larger version. 

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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 http://www.neverseezproducts.com/regulargrade.htm 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