i don't know if there is one or not, but something to check into. there might also be a circuit relief valve that is relieveing pressure within the cylinders, you say "in a hard push" is it possible that the force you are applying to the blade could be lifting a circuit relief valve to protect the hydraulic components in the circuit? most of the six way PAT blades are not really designed for heavy duty bulldozing, more for trim work and finishing.
I have been told a cylinder having oil leak past the seals will heat up very fast. So feel temp and make the push that moves it a time or 2 and then compare temperatures to other cylinders not in that circuit. If it is warmer than others repack cylinder,if not your problem is else ware.
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