4422188 PISTON HITACHI for ZX200/6BG1T

The Power Conversion Core of Your Hydraulic System – Precision-Engineered to Transform Fluid Pressure into Mechanical Force.
The piston is the fundamental working component that converts hydraulic fluid pressure into the linear mechanical force driving your Hitachi excavator's boom, arm, bucket, and travel functions . Whether operating within hydraulic cylinders or reciprocating within axial piston pumps, this genuine Hitachi piston is precision-machined to exact outer diameter, length, and surface finish specifications. Available in configurations for Isuzu 4BD1-T engine applications (EX120, EX120-2, EX120-3, EX150 excavators) and HPPV variable displacement pump series , it delivers reliable, responsive machine control and consistent hydraulic power.

Premium Materials and Advanced Surface Engineering – Built for High-Pressure Operation and Extreme Durability.
Manufactured from high-strength, heat-treated alloy steel with precision-ground bearing surfaces, this genuine piston withstands extreme pressures (up to 350 bar), shock loads, and continuous reciprocating motion . The precisely controlled outer diameter ensures proper clearance within the cylinder bore or pump cylinder block, minimizing internal leakage and maximizing volumetric efficiency. Advanced surface finishing reduces friction and promotes consistent oil film retention, while the optimized metallurgy provides exceptional resistance to scoring, galling, and fatigue under sustained high-load conditions. For hydraulic pump applications, variable displacement axial piston designs feature hardened components and advanced sealing structures that extend service life .