The life expectancy of seals for hydraulics typically varies from 8,000 to 15,000 hours of operating time under normal conditions. However, this could vary from a mere two hours in the case of extreme applications to a staggering 20000 hours for well-maintained systems with low stress. The life span is determined primarily by seal material, fluid tolerance, thermal exposure, contamination control, the surface finishing of mating components, and pressure cycling, not by a predetermined date. A seal that is maintained properly can last longer than its theoretical lifespan; a seal subjected to poor fluid cleanliness or extreme temperatures could fail within a fraction of the time expected.
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