Reply to thread

Message: <blockquote data-quote="Gearclash" data-source="post: 136058" data-attributes="member: 11467">If the spool valve that controls those cylinders cannot leak, it is impossible for the cylinders to be forced to retract more than a very small amount.  When a cylinder retracts, the rod displaces some of the total volume of oil in the cylinder barrel.  If the oil has nowhere to go, the pressure in the cylinder builds until the rod can no longer retract.  It doesn't matter if the seal is damaged, missing, or even if the rod piston is gone.  Now if the cylinder is forced to extend and there is a bad piston seal, there can form a vacuum in the cylinder to account for the oil volume change.  In the event of a bad cylinder seal, it is possible for leakage on the "wrong" side of the spool valve to allow the cylinder to retract.  Since your machine will not sag the tilt cylinders to retract, there is almost certainly a cylinder seal leak.</blockquote>