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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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