Be aware that the early 4020 and the side console 4020 are very different in all the hydraulics. They have distinct parts books and shop manuals because they are so different. 1966 is early.
In my parts book I see a "junction block with steering and brake pressure valve" For tractor SN 65000 to 105111 the block without parts is AR34662 sub for AR31125 SUB by AR51732. Parts to fit the latest early 4020 also fit AR51732 replacement assembly, sub for AR31125, AR34462, AR40029, and AR40130.
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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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