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 - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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