The Seal 86684271 is a critical motor protection component for HC25 Hydraulic Rock Drills, specifically designed to seal the gap between the motor shaft and housing. Generic shaft seals often use single-lip designs that wear out within 500-600 hours, allowing dust to infiltrate the motor and cause bearing failure. This OEM seal features a double-lip structure with a dust-proof lip that traps debris before it reaches the motor, and its high-wear rubber formulation ensures wear is limited to ≤0.03mm over 800 hours. It maintains a tight seal against oil leakage, extending motor lifespan by preventing contamination.