You went from 30 weight hot to 50 weight hot which is an improvement but not twice the viscosity. And, as you have experienced, doubling the viscosity does not double the pressure drop from the pump to the crankcase. As long as there is an open flow path for a gear pump increasing the viscosity does increase pressure drop from pump to bearing exit but only so much as the viscosity affects the pressure drop, which is not one to one and is not linear.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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