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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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