Hydraulic Problem

[bherr]

Well it seems my BP series II problems are coming in three's. My first problem was the spindle motor and I got that fixed then my Phase converter crapped out and now its the Hydraulic pump.
I've attached a photos of the pump. the large black hose is the Hydrauloc line to the spindle cyclinder at the top of the Z spindle which pushed down on the spindle to release the tool. the small circular thing to the left I believe is the air valve, which I think pushes the hydraulic fluid to the top piston. It was working without any problems, but started acting up when I had to disconnect the hydraulic line to the top cylinder to remove the DC spindle motor. After I installed I kept having to bleed the hydraulic line as air kept getting into it. I've checked all the connections, but now it won't even push fluid to the top. Does anyone know if there's some bleed point of this lower master cylinder, as I'm thinking it may be air bound, similar to a water pressure tank on a well. Any ideas would be greatly appreciated and thank you.

Ben