With over a decade in mining equipment maintenance, I’ve seen generic O-rings fail repeatedly: most use low-quality rubber that loses elasticity in 400-500 hours (due to HC95’s oil and temperature fluctuations), or swells excessively when in contact with hydraulic fluid—losing sealing ability. In contrast, this O-ring 86675998 is a genuine OEM part, engineered to Montabert’s strict standards for durability and compatibility. It uses a specialized nitrile rubber compound (reinforced with anti-aging and anti-swelling additives) that retains flexibility and oil resistance even after 800+ hours of use—no premature cracking or deformation.

Its inner diameter and cross-sectional thickness are machined to ±0.003mm tolerance, ensuring a perfect fit with HC95’s hydraulic interfaces: no “over-compression” (which shortens service life) or “looseness” (which causes leaks). Since O-ring wear varies by environment (e.g., underground dampness accelerates aging faster than surface dryness), the “replace based on actual usage” guideline lets you optimize maintenance—no unnecessary replacements, but timely changes when signs of damage appear.

With short delivery times (no 2-3 week waits like generic O-rings) and competitive pricing, this O-ring 86675998 becomes an essential choice for mines prioritizing cost-efficiency and equipment reliability. Whether you’re drilling in underground hard-rock mines or surface quarries, it keeps your HC95’s hydraulic system sealed and protected—ensuring stable drill performance shift after shift.