Many forklifts, especially the older ones, don't have an actual seal in them. Even those that do usually have some sort of bleed valve that allows oil on top of the pistol. I've worked on, and seen, both over the years, on everything from Hyster's to CAT's to Komatsu's and even a Toyota or two.
In the case of those without a true seal, they rely soley on the difference in surface area of the bottom side of the piston and the top side, and the differential pressure created by that size difference, to provide the lift.
Those with a seal on the piston simply use the surface area on the bottom to achieve lift, and then will dump some of that pressure to the top of the cylinder, when the cylinder tips out to prevent damage.
Too this arrangement insures no more oil than is necessary has to be put into, or taken out of, the cylinder to achieve the best possible lift, and lower speeds.
Regardless of any of that, the ONLY thing the top hose does is to provide a low pressure bleed port(to the tank) for any oil that happens to be on top of the piston.
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