VPH102GW-RH23D 9201020 9191179 bomba hidráulica para Hitachi ZX225US ZX225USR excavadora

1. Machine Compatibility & OEM Part Numbers
The RH23D variant is specifically calibrated for the reduced tail-swing geometry of the following models:

Primary Machine Fitment:

Hitachi ZX225US (Ultra Short)

Hitachi ZX225USR (Ultra Short Radius)

Hitachi OEM Part Numbers:

9201020

9191179

Condition: Original Brand New / OEM Specification.

2. Technical Specifications & Design
This pump is part of the HPV series, known for its ability to handle high-duty cycles in construction and demolition.

Type: Tandem Variable Displacement Axial Piston Pump.

Control System: Features the RH23D regulator, which is uniquely tuned to provide smooth flow-sharing. This allows the operator to boom up, arm in, and swing simultaneously without the machine feeling "heavy" or sluggish.

Compact Housing: Engineered to fit within the narrow engine compartment of the ZX225US without sacrificing displacement or cooling efficiency.

Pressure Rating: Rated for 34.3 MPa (343 bar) with a peak power-boost capability.

3. Why Choose the Original/OEM Brand?
For the ZX225 series, the pump is the most critical component for maintaining "feel" and safety in tight spots:

Micro-Precision Control: When working inches away from walls or traffic, you need exact joystick-to-pump response. Original pumps utilize precision-lapped valve plates that prevent the "jerky" movement common in low-quality aftermarket clones.

Engine Power Matching: The RH23D regulator is factory-set to the torque curve of the Isuzu engine. This prevents engine "bogging" or stalling when the hydraulic system hits maximum load.

Metallurgical Durability: Original units use high-silicon alloy cylinder blocks that resist heat-soak and cavitation, ensuring the pump lasts 10,000+ hours with proper maintenance.

4. Critical Installation Protocol
To protect your investment and ensure a successful installation, please follow these expert steps:

Case Priming (Mandatory): Fill the pump housing with clean hydraulic oil through the highest case drain port before starting the engine. Running the pump "dry" for even 5 seconds will cause the piston shoes to weld to the swash plate.

System Decontamination: If the previous pump failed mechanically (shrapnel in the system), you must flush the hydraulic tank and clean the oil cooler.

Filtration: Install a new suction strainer and high-pressure return filter (Genuine Hitachi 10-micron). Use ISO VG46 anti-wear oil.

Air Purge: Run the engine at low idle for 10 minutes. Slowly cycle all cylinders to their limits to purge air before performing any heavy work.

5. Frequently Asked Questions (FAQ)
Are 9201020 and 9191179 fully interchangeable?
Yes. 9201020 is generally the more recent engineering revision. Both are designed for the ZX225US/USR series and share identical mounting and performance specs.

How do I identify a genuine OEM pump?
Look for the data plate featuring the Hitachi or Hitachi Astemo (Nachi/Unisia) logo. Genuine units will have clean, precision-machined port faces and high-quality protective shipping plugs.

How long does shipping take?
We prioritize "Machine Down" orders. Global express shipping via DHL, FedEx, or UPS usually takes 3 to 7 business days to arrive at your site.

Does the pump come with the solenoid valves?
Yes, our Original/OEM Brand New pumps are sold as complete assemblies, including the pre-calibrated regulators and proportional solenoid valves.