I have taken apart the pistons and ordered some quad rings of various sizes to see if I can better control the slight leakage from where the piston rod comes out. The stock O rings seemed kind of loose.
Received my package yesterday from
http://www.der-getriebedoktor.de/shop2/topangebote.php
Now I have a manometer, new bell crank and more hose and hose sleeves.
I was running it a couple days ago when one of the valve servos quit working, so I took it apart and it was fine. But then the other servo valve wasn't centered and I went to adjust it and got nothing. Motor was pumping but nothing was moving. So I started taking everything apart. I probably just had air in there from holding the pump assembly vertically, but now I had an excuse to finally take apart the pistons and see if I couldn't get different Orings for a better seal where the piston rod was coming out of the cylinder body.