In HC95 Hydraulic Rock Drill (or Hydraulic Drifter) systems—where high vibration (up to 1600 bpm) and constant component movement are common—the Packing 101015576 (plastic ring) plays a critical “cushioning and positioning role.” It’s installed between metal components (e.g., the cylinder and end cover) to fill micro-gaps, absorb vibration impact, and prevent direct metal-to-metal contact—an issue that causes premature wear and noisy operation. With over a decade in mining equipment maintenance, I’ve seen generic plastic rings fail repeatedly: most use low-density plastic that deforms or cracks in 300-400 hours, losing its cushioning ability and leading to component misalignment. This misalignment can cause hydraulic oil leaks, reduce drill efficiency by 15-20%, and even damage expensive parts like the piston—costing mines $2,000+ in repairs and 1-2 days of unplanned downtime.