I am certain that I have the "Early Self-Leveling"version, and the design is double acting. See Pix (705-273-M91). The packing seals are correct and same as replaced on the other side of the machine that did not fail. I have to believe the parts are correct since they were obtained thru Yesterday'sTractor, and from well known After-Market mfr since MF/Agco no longer has these seal kits available. I suspect the seals should go in like this:
(lift-pressure) >>>>>>> (retract pressure)
However, you raise very good question about the packings. My example above has the lips pointing toward the lift pressure, and the failure (see pix in prior reply) shows the fluid blew past during retraction. Perhaps you are right and entire stack of packing are not correct for this double acting situation, even though advertised to be correct part number. I have not seen original parts so can't be sure. Sure wish I could talk the mfr but they seem to be insulated from us users by distributors.
I might mention that the later version (708-430-M91) is different and uses a better dynamic o-ring+backup ring design. I can't find anybody with the metal piston the o-rings ride in (1-033-686-M1). If I could get one, or the dimensions so I could make one, and buy the seals for that design I would convert what I have to the later design. The seal kits are much more readily available for it.
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