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 - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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