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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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