hassjb

The control valve is a new Prince open center 2 way control valve with 2500psi relief. The fact that it doesn't reach the relief pressure now leads me to believe the 2 stage pump isn't switching over to the high pressure side, or second stage, causing the motor to bog. Possible?

I have a home built press with a new 5hp, 220v, single phase motor, 5" cylinder and 2 stage pump that I can't remember the size of. Here's my problem. When I reach the end of the stroke on my cylinder the engine bogs and will stop totally if I don't release the control valve. My question is, does the pump have an internal relief? I replaced the control valve and that wasn't the problem so with a new motor and new control valve I'm leaning towards a faulty relief in the pump. Any ideas?...Joe