Many fixed displacement gear pumps are used in open center systems. Ford did a lot of that over the years with smaller tractors.
What Jim is talking about... is technically classed as an open center load sensing system as it used fixed displacement gear pumps and an unloading valve. However... all spool valving beyond the load sense valve WAS Closed Center Load Sensing (CCLS). They used the same CCLS remotes as would have been used on modern Pressure Flow Compensated (PFC) hydraulic systems that is standard on all larger tractors today.
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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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