ZX70 Excavator 4446254 4458863 4612822 Hydraulic Boom Cylinder Assy
for ZX70LC ZAX70 Parts
| Hydraulic Parts | Hitachi ZX70 Hydraulic Boom Cylinder |
| PN | 4446254 4458863 4612822 |
| Excavator Models | ZX70 ZX70LC ZAX70 |
| Cylinder Seal | Superior quality named-brand seals |
| Temperature | -40°C to 120°C |
Pressure | Up to 60Mpa |
Every GLPARTS excavator hydraulic cylinder is crafted with
precision and durability in mind. We follow a strict, multi-step
production process to ensure exceptional strength, wear resistance,
and long service life—even in the harshest working conditions.
Step-by-Step Craftsmanship That Delivers Real Results:
Material Selection
We use 25Mn steel tubes and high-strength alloy steel rods,
ensuring excellent toughness, pressure resistance, and fatigue
durability from the core.
Tempering Treatment
All rods and tubes undergo full tempering heat treatment,
eliminating internal stress and enhancing the metal structure for
long-term stability and crack resistance.
CNC Turning & Precision Machining
High-precision CNC turning ensures tight dimensional control,
laying the foundation for smooth piston motion and exact fitment.
High-Frequency Surface Quenching
The piston rod surface is hardened up to HRC 55+, enhancing wear
resistance and minimizing surface deformation—especially under
repetitive impact or abrasive conditions.
External Grinding
After quenching, the rod is finely ground to achieve a uniform
surface, essential for ensuring seal life and reducing friction
during movement.
Hard Chrome Plating
We apply a thick, industrial-grade hard chrome plating layer,
enhancing corrosion resistance, improving seal contact, and giving
the rod a high-gloss finish that minimizes oil residue buildup.
Final Grinding & Surface Finishing
A final round of grinding ensures mirror-like smoothness, ideal for
low-friction performance and extending the life of seals and
internal components.
