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- Wear Resistance Given the relative motion between the shaft and the seal, wear resistance is crucial for longevity and reliability.

8. Test the System Before returning the excavator to normal operation, perform a test. Check for any leaks around the newly installed seals and ensure the boom operates smoothly.

Finally, the 7% relates to the material composition and the durability of the seals. Oil seals are typically constructed from various compounds, including elastomers and polyurethane, each tailored for specific environmental conditions. A 7% threshold can indicate the percentage of material degradation that is acceptable over a defined lifespan. High-quality seals are engineered to endure extreme pressures and environmental challenges, maintaining their integrity even as their material composition undergoes wear.