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Hydraulic cylinders operate on the principle of Pascal's Law, which states that pressure applied to a confined fluid is transmitted undiminished throughout the liquid. Engine hoists typically use these cylinders to lift engines and other heavy components by converting hydraulic pressure into linear motion. However, constant use can lead to issues such as leaks, reduced lifting power, and eventually, cylinder failure.

The metal case reinforces the structure of the seal, allowing it to withstand external forces and maintain its shape under operational stress. Additionally, many seals feature a spring located behind the sealing lip, which exerts constant pressure on the lip against the shaft. This pressure helps maintain the integrity of the seal, especially in dynamic applications where the shaft is rotating.

Regular inspections and maintenance help to monitor the condition of oil seals. Signs of wear, such as cracking or hardening of the seal, indicate that replacement is necessary to avoid significant failures.