In HC95 Hydraulic Rock Drill (or Hydraulic Drifter) systems, the Hose 86747318 is a “vital fluid transmission channel”—it carries high-pressure hydraulic oil (up to 2000 psi) between key components like the hydraulic pump, cylinder, and control valve. This oil transmission is critical for the drill’s impact and rotation functions; a faulty hose can cause sudden oil leakage (wasting 8-10 liters of oil per incident) or even hose burst (posing safety risks to operators). With over a decade in mining equipment maintenance, I’ve seen generic hydraulic hoses fail prematurely: most use low-quality rubber that hardens or cracks in 600-800 hours (due to HC95’s high pressure and mining vibration), and their connectors often leak after repeated assembly—leading to $2,200+ in repairs and 1-2 days of unplanned downtime.