You can add an open center two spool valve by feeding the output of none port to the input of the valve, then plumb the outlet port of the valve back to the other port of the power-trol valve. Then block or tie the power troll lever in position to feed the added valve. I use this method on my loader on my JD A. This will allow independent control of both drawn implements. Glennster's idea is the simplest way to do it if you want them both up or down at the same time. The unit that is easiest to lift will raise first, as soon as it is all the way up, the other will raise. You may not be able to precisely control the depth of the drawn units, but if that's not important it sure is easy.
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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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