After thinking through it some more I'd agree that the piston coming off the rod is plausible, especially if the problem showed up all of a sudden. This would essentially turn the double-acting cylinder into a single-acting cylinder with the rod end port becoming the one work port. The need for oil to exit the cylinder when extending would be eliminated and of course would make it impossible to retract. In theory the force to extend the cylinder due to backpressure (from line loss, filter restriction, etc) combined with valve spool leakage into both ports while in the neutral position is the same whether or not the piston is attached to the rod - it is just the pressure times the rod area. But, without the relatively high drag resistance of the piston seal helping hold it in place it could extend with very little pressure.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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