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4. O-Rings Though often used in static applications, specifically designed O-rings can serve as effective shaft seals in hydraulic systems. Their circular shape allows them to compress and create a tight seal under pressure.

1. Fluid Leaks The most obvious indication that a hydraulic seal needs replacement is the presence of hydraulic fluid leaking from the system. Any visible fluid outside of the designated compartments is a red flag.

4. Lip Seals Lip seals are suitable for both dynamic and static sealing applications. They feature a lip that runs along the surface of the cylinder, creating a barrier against fluid leakage.