Those valves are two way selector valves. They are push pull. Grab the knob and pull it one way and it directs oil to one circuit push it in and it directs oil to the other circuit. I see one of the valves is missing its knob. When you were digging one might have gotten bumped and is in the middle of the two circuits causing slow cylinder action. Make sure the valves are all the way in one direction and I bet your problem disappears. Your going to have to experiment to find out witch position the valves need to be. You can also remove them if you want as they serve no purpose other than connecting another cylinder in the circuit.
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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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