Power steering pump issues 2 cylinder


I have a JD 50 2 cylinder that I have rebuilt the power steering pump on twice. Both times is blows the front seals out. I will get about 3 to 5 hours out of running it and then it just goes. No leaks or nothing prior to it just blowing out. The second time I put a pressure gauge in line. High idle it?s got a few hundred PSI when turn the wheels is goes up to about 500 psi. holding the wheels to one side it will get it up to about 1000-1200 max. When I rebuilt it I made sure the shaft relief hole for the front seals was open. Installed 2 seals same direction to keep the oil in the pump. On the back side 2 seals. I removed the spacer washer. When I took the pump a part I followed the book for all specs. Cleaned up the 2 surfaces and put a light coating of aviation gasket maker around the edge to help seal it up.

I?m restoring this tractor and the original power steering pump was missing. I purchased a used one with the external relief on the side. According to the book it looks like the relief parts have been updated.
 
I'm guessing it is blowing the seals on the front (pulley) end of the pump? It sounds like the pressure relief setting may be too high or the steering control valve / flow control valve is causing some pressure buildup issues. I have always installed the seals back to back to keep air from being sucked in and oil from being pushed out. Not sure that the seal direction could cause them to blow out however unless installed in reverse (exposed spring facing the oil). Just a couple of thoughts.
 

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