720 power trol leak

my 720 is leaking hydraulic oil from the cap nut and screw that is used to switch between single and double acting cylinders when the pump is engaged. i have only been using the 3 point a little bit this spring, no scv use yet, i put a new sealing washer under the cap nut but it still leaks and its tight enough that i don't want to go any tighter. it is set for a double action cylinder but that shouldn't make any difference.

what is making it leak or better yet what do i have to do to get it to quit? should i try another washer and make sure there the sealing areas are clean and flat?
 

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