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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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