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 Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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