굴착기 Hitachi ZX210W-3 ZX220W-3 ZX250W-3용 유압 펌프 Hitachi HPV118HW-25A 9275341 9274600

1. Product Identification & Compatibility
This pump assembly is the "Original Brand" replacement for the following Hitachi factory specifications:

Model Number: HPV118HW-25A

Hitachi OEM Part Numbers: 9275341, 9274600

Machine Fitment:

Hitachi ZX210W-3

Hitachi ZX220W-3

Hitachi ZX250W-3

Condition: Original Brand New (Genuine Hitachi/Nachi Architecture)

2. Technical Specifications
The "HW-25A" designation indicates specific regulator tuning and port configurations unique to the wheeled (W) series:

Type: Tandem Variable Displacement Axial Piston Pump.

Max Pressure: 34.3 MPa (343 bar) during heavy excavation; 36.3 MPa (363 bar) during power boost.

Control System: Integrated with LS (Load Sensing) and PC (Pressure Compensation) valves, calibrated specifically for the Isuzu 6-cylinder engine torque curve.

Hydraulic Efficiency: Features a "Swash Plate Angle Sensor" and advanced electromagnetic proportional valves to ensure precise flow sharing between the travel motor and the digging attachments.

3. Why Choose the Original Brand?
For the ZX210W-3/220W-3/250W-3, the original pump is critical for performance consistency:

Stable Travel Performance: Wheeled excavators must maintain straight tracking at high speeds. Original pumps ensure perfectly balanced flow between the left and right travel circuits, which aftermarket clones often fail to achieve.

Thermal Resilience: These machines often perform long-distance roading. Original metallurgy in the cylinder blocks and valve plates is designed to withstand the heat-soak that occurs during high-speed travel without losing volumetric efficiency.

Regulator Harmony: The 9275341 regulator is pre-set to factory specifications. This eliminates the "engine lugging" or stalling issues commonly seen when installing uncalibrated aftermarket pumps.

4. Professional Installation Protocol
To protect this high-value component and ensure a long service life, follow these mandatory steps:

Case Priming: MANDATORY. Before starting the engine, fill the pump housing with clean hydraulic oil through the highest case drain port. A "dry start" will destroy the internal piston shoes and swash plate surfaces instantly.

System Decontamination: If the previous pump failed mechanically (sending metal into the system), you must flush the hydraulic tank, clean the oil cooler, and flush the pilot lines.

Filtration & Oil: Always install a new suction strainer and high-pressure return filter. Use ISO VG46 anti-wear hydraulic oil.

Air Bleeding: After installation, run the engine at low idle for 10 minutes. Cycle all cylinders and the travel motor slowly to their limits to purge any trapped air.

5. Frequently Asked Questions (FAQ)
Are the 9275341 and 9274600 numbers interchangeable?
Yes, they are generally interchangeable. 9275341 is typically the most current engineering revision, offering improved seal durability over the older 9274600 version.

How do I verify that I am receiving an "Original Brand" unit?
Genuine units feature a factory-stamped data plate with the Hitachi/Nachi logo, specific serial numbers, and precise casting marks. Original pumps also arrive with high-quality protective shipping plugs in all ports.

What is the expected shipping time?
For urgent repairs, we offer global express shipping via DHL, FedEx, or UPS. Delivery typically takes 3 to 7 business days to most international locations.

Does this pump come with the regulators?
Yes, our Original Brand New pumps are sold as complete assemblies, including the pre-calibrated LS and PC regulators.