Is there truly a shortage of forklift mechanics in Hawaii? I should get on the next plane! Seriously though, I wouldn't reccomend trying this repair yourself if you don't have experience with this type of work for safety reasons, but the technical aspect of replacing the seals on a lift cylinder is usually not that challenging. Also I would recommend replacing the seals on both cylinders since its not much more work than doing just the leaky one. Changing the hydraulic oil & filter whenyour done would be a good idea too.
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