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Dax DeCelle

606 Steering control (pilot) valve repair

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As some of you may remember, I have been working on the hydraulic system on my 1964 606. I had "hard spots" in the steering, which would cause times in which the steering became difficult momentarily. I have now found what I believe to be the culprit. On the steering control (pilot) valve, there is a "pressure check valve" on the input port of the valve. When I removed the control valve, the "poppet" fell out and it looks clear that there is further damage inside the check valve. The Blue Ribbon service manual GSS-1337-C, says 

"inspect the pressure check valve poppet and it's seat for grooves or defects that may result in leakage. If the poppet and seat seem to be defective, replace them." 

What it does not say is how to remove the parts. There is a retainer ring that comes out easily. The next thing I see is a damaged rubber "seal." How do the innards come out? I don't want to do any more damage, so I'm hoping someone here knows. Thanks as always. 

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Got it. It is pressed in, it was just stuck. It is definitely damaged. The poppet and seat are worn and misshaped.  Now hopefully Messicks has the parts I need. I'm getting excited now. I bought this tractor last February and in classic Johnny Cash style, I'm getting it back in action "one piece at a time." Maybe by the one year mark, it will be ready for a road trip. 

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Its always good when a plan comes together!:)

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Finally got the parts today. The old "seal" or "disc" was destroyed, as well as the "valve." I'm not 100% sure how the new "disc" goes in. I think the valve seats in the disc like the second picture I've included, but it could work the other way as well. Anyone know?image.thumb.jpg.cb0c9facddb491ee4db1a9e059bc21f1.jpgimage.thumb.jpg.6fb8d16f320d7defc05ca52b5847dd7a.jpg

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Check valve goes into valve body with spring above it and then seat goes in.  The idea of valve is to allow flow of oil into valve but not back out when engine is shut off.   

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I know the arrangement, it's the orientation of the seat that I am unsure of. I assume the poppet rest in the beveled side of the seat, as I have pictured in the second photo. 

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