Well it's a valve used to bleed foreign material from the pump. I'll let you know what happens when I cap the power steering supply line,may not be until next week.
I changed the oil and filter and cleaned the oil screan and flushed the front hydraulic pump. I also installed a control valve for the front end loader,closed system.
Thanks for your reply I changed oil and filter,cleaned the screen. I also opened the flush valve,, on the front hydraulic pump,with no results still got the same problem. Coming to you from Hallettsville,Texas.
Bought a 2130 John deere ,after starting tractor thepower steering nor hydraulics will work until you start turning the steering from left to right a couple of times power steering starts working then the front end loader will also start working?