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Once the jack's shafts are retracted, they are immersed in oil, the seal holds the hydraulic fluid (oil) from leaking out, and there is fluid between the seal and the piston on the rod shaft.
So long as they are fully up, no need to worry about the shafts getting corroded. It's when you leave them extended for long periods of time and weather conditions they get exposed to. Like extended weeks on end, windy rain washing them off, etc.
Cycling them assures you they are still working properly.
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Rusty
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