The Hydraulic Motor 86697083 is the primary power source for HC25 Hydraulic Rock Drills, converting hydraulic energy into mechanical energy to drive rotation and impact. Generic hydraulic motors typically have low efficiency (≤80%) and fail within 2500-3000 hours due to imprecise gear machining and low-quality seals. This OEM motor achieves ≥88% efficiency with precision-ground gears (tolerance ±0.001mm) and high-performance seals. It is rated for 1800psi operating pressure and undergoes rigorous testing to ensure reliability, requiring replacement only for noise, leakage, or power loss.