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A/C 917 hydro pump check valve question

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I picked this tractor up in May and just got around to finishing the engine work and had it running sunday and while looking it over found oil on top of the rear check valve. What's the proper fix for hydro oil coming up through the center of the check valve assy? Is it over filled, do I have to replace the complete assy, or just remove it and clean it? Any advise is greatly appreciated.

hydro pump check valve 2.JPG


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One of mine did that and I couldn't get it to stop so I had to swap it out with another used one. The one that was leaking looked brand new and crystal clean... still have no idea but the used one that I put in is fine

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