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Byron Fox,
I had a similar problem with my landing gear hydraulics.  That is, the high
pressure side would hold just fine but I had repeated on/off cycling when
gear was in the down position.  The problem turned out to be the small O
ring seal at the threaded end of the center rod in a main gear retract
cylinder.  Examination of this seal will explain why it is effective in one
direction only.
Bob Jude
N65BJ

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