Case power beyond port

[Hotrod1830]

Been doing some poking around on my 1830. I noticed that my loader spool valve has a power beyond port. There is a loop between that and the return port. This skid does not run aux. hydraulics a the moment. Is this port supposed to be plugged off or is the loop OK? Still looking for a cause to my strange Humming from the pumps. Brad

 

[Tazza]

It sounds odd that the PB port is looped back.... They are generally plugged, but if its factory, it has to be there for a reason?

 

[Hotrod1830]

It sounds odd that the PB port is looped back.... They are generally plugged, but if its factory, it has to be there for a reason?

It doesnt really look like a factory loop. I looked in the service manual, and it says the aux valve is free flowing in nuetral, so I guess the loop wont hurt anything. I thought I was on to something.