The Seals Kit 86794393 is a comprehensive sealing solution for HC25 Hydraulic Rock Drills, including every seal needed for a full system maintenance overhaul. Generic seals kits often omit hard-to-find seals or use low-quality rubber that fails within 500 hours, requiring frequent re-sealing. This OEM kit includes high-pressure resistant seals for cylinders, valves, and motors, all made from nitrile rubber with anti-aging and anti-wear additives. These seals withstand -30℃ to 120℃ and maintain elasticity over 800 hours, ensuring the entire hydraulic system remains leak-free until the next mandatory replacement cycle.