Hydro 86 3-point wont hold position

Good Morning, recently bought a hydro 86, love the tractor, I could listen to that 310 purr all day long. only issue i have is that the 3 point hitch is not holdings its position, say i had at implement 6 inches off the ground with the tractor running, it would drop about an inch, then lift back up an inch, then repeat all day long. if I fiddle with the draft lever its seems to go away for about a minute, then right aback into its old tricks. Something out of adjustment? or is the piston leaking real bad?

thanks for the input

Matt
 
You are right, piston leaking. Put new 0 ring on piston in a 656 a few years ago. That seemed to fix it.
 

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