I believe one of the first companies to make hydraulic coupler break-away couplers was Brunning. In 1949-50 is when some of them first appeared on the Minneapolis Molines as a 3 piece coupler, two male ends and a connecting sleeve in the middle. The connecting sleeve had a bracket that fit into a support iron to allow movement. Some of the AC's had the male end on the tractor, male end on the ram and connected with the sleeve. Some place I saw a picture in an AC manual with a strap and chain to hold the bracket. It must not have worked real well for AC as I don't think it was used long. The Brunning couplers were used on MMs until the mid 1960s when Pioneer was getting more popular. They were also used on some of the 4000-5000 Fords.
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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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