0788803 PLUNGER HITACHI for ZX170W-3F/4JJ1T

Precision Reciprocating Component for High-Pressure Systems – The Core Element of Fuel Injection and Hydraulic Power.

This genuine Hitachi plunger is a precision-engineered component that slides within a cylinder bore to pressurize fuel or hydraulic fluid. In fuel injection pumps, it is part of a plunger-and-barrel assembly that delivers high-pressure fuel to the engine's injectors. In axial piston pumps used in excavator hydraulic systems (e.g., ZX210LC-3), the plunger (piston) reciprocates within the cylinder block to convert mechanical rotation into hydraulic flow.

Superior Metallurgy and Precision Fit – Built for Extreme Pressures and Long Service Life.

Manufactured from high-hardness, wear-resistant alloy steel, this genuine plunger is precision-ground to exact OEM tolerances to ensure a perfect seal within the barrel or cylinder bore. In fuel systems, the plunger and barrel are matched as an ultra-precision set (plunger-and-barrel assembly) with clearance measured in microns. In hydraulic pumps, plunger surfaces are hardened to resist scoring and fatigue under continuous high-pressure operation. Available in specific configurations for Hitachi excavator models and engines, including 4BG1T, 6HK1, and EH700 engines.