In HC95 Hydraulic Rock Drill (or Hydraulic Drifter) systems, the Hose 86754801 serves as a “critical fluid connection”—it links key components like the hydraulic pump, control valve, and cylinder, carrying high-pressure oil (up to 2000 psi) that directly powers the drill’s impact and rotation. A faulty hose can disrupt the entire hydraulic circuit: minor leaks waste costly hydraulic oil (up to 10 liters monthly), while severe damage (like burst hoses) can halt mining operations entirely. With over a decade in mining equipment maintenance, I’ve seen generic hoses fail to meet HC95’s demands: their low-quality rubber hardens in 500-700 hours under constant pressure, their connectors rust easily in underground dampness, and poor sealing leads to frequent leaks—costing mines $2,300+ in repairs and 1-2 days of unplanned downtime.