When you say o-ring on the suction tube of pump, just what are you referring to. The pump has an o-ring inside the inlet the suction tube goes into, but the tube itself has a lip seal that seals in the counter bore of transmission housing that leads to the hydraulic filter. That seal has to fit tight in the counter bore and must be basically bottomed out when pump is installed. It also moves on the tube to adjust to the length you need for different pumps. That is the first place I would suspect. Other two places, gasket and o-ring between the two piggy back pumps and then the gasket on the filter itself. If you are confident the main suction tube to the rear end is good that is about the only places to suck air.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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