In HC20 Hydraulic Rock Drill (or Hydraulic Drifter) systems, the Strike piston 86668738 is the “power core of rock-breaking”—it’s responsible for translating high-pressure hydraulic oil (up to 1800 psi for HC20) into cyclic mechanical impact force (up to 12 kN), which directly strikes the shank to drive the drill bit into rock. This part endures extreme stress: each working cycle involves high-speed reciprocation (1300-1500 bpm) and repeated metal-to-metal collision, making its wear rate predictable—and why Montabert specifies a 800-hour mandatory replacement cycle.

1. Wear resistance: Its impact surface is made of heat-treated high-carbon alloy steel (HRC 52-56) with a wear-resistant coating, ensuring it maintains full impact force for the entire 800-hour cycle.
2. Precision fit: The piston’s outer diameter and concentricity are machined to ±0.003mm tolerance, ensuring seamless sliding in HC20’s cylinder liner—no oil leakage or energy loss.
3. Structural stability: The piston body is reinforced at stress points, preventing cracking or deformation even under long-term high-impact use.