I would first remove the pump & check the oring grooves to be sure you hadn't missed any stubborn remnants of the old orings in the bottom of the grooves.
Take your "new" orings with you to a hydraulic parts & repair shop & see if they can provide you with slightly oversized ( thicker not larger diameter) vitron orings.
Check the flatness of both the pump boss & hydraulic line block with a straight edge. If they are warped take a flat mill b-tard file & GENTLY flatten the surface, the pump housing is aluminum so go easy, a little goes a long way. After removing 10 to 20 thousandths from each this will squeeze the orings a bit more & hopefully stop the slight leak.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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