"This shuttle valve is spring loaded to center so without the pump running"
This is the key to the problem. The pumps I have disassembled (all ~'95-'99) were not spring loaded to return the shuttle valve to center.
Other potential issues:
The pump CIPR ratings are different seem to be off by a decimal place when compared to old literature. (must be a typo somewhere)
The part number indicates the highest flow rating .0321 is used. This is different than the pumps I have taken apart.
Does the current spool valve have an O-ring?
Why was the flow rate/rev changed.
I hope my pumps never die.
Chris Zavatson
N91CZ
360std