In HC20 Hydraulic Rock Drill (or Hydraulic Drifter) operations—whether in underground mines with high humidity or surface quarries exposed to rain—the Lip seal 86262698 (water seal) is a critical “protective barrier” for the hydraulic system. It’s installed at the junction of the drill’s water cooling circuit and hydraulic components, stopping water from mixing with hydraulic oil (a major cause of oil degradation, pump wear, and valve failure). With over a decade in mining equipment maintenance, I’ve witnessed generic water seals fail in as little as 90-110 hours: their low-grade rubber lacks water resistance, softens or cracks after repeated contact with water, and can’t withstand the HC20’s 1400+ bpm vibration. This leads to unplanned downtime (1-2 days per incident) and repair costs exceeding $2,000—losses that eat into mining productivity.