Hitachi HPK060BT -18A / 17B 9285566 Hydraulikpumpe für Hitachi ZX120-3 ZX130-3 ZX135US-3 Midibagger

1. Comprehensive Machine Compatibility
This pump series is a direct "bolt-on" replacement for the following Hitachi Zaxis models:

Standard Models: ZX120-3, ZX130-3

Short Tail / Radius Models: ZX135US-3

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

OEM Part Numbers: 9285566, 9285685, 9290597, 9290598

2. Technical Specifications & Performance
The HPK060BT series is designed to handle high-duty cycles while maintaining fuel efficiency:

Type: Tandem Variable Displacement Axial Piston Pump.

Control Logic: Equipped with -18A or -17B series regulators, which are factory-tuned to match the torque output of the Isuzu 4JJ1X engine.

Max Pressure: Rated for continuous operation at 34.3 MPa (343 bar) with peak power-boost capabilities.

Architecture: The tandem design allows for independent flow to the travel motors and the front-end attachments, ensuring the machine doesn't lose digging power while moving.

3. Why Choose the Original Brand?
For the ZX120-3/135US-3, the original pump offers distinct advantages over aftermarket clones:

HIOS III System Synergy: The original regulators respond instantly to the electronic signals from the machine’s controller. Aftermarket pumps often have a "delay," resulting in jerky joystick response or engine "bogging."

Optimized for Tight Spaces: The ZX135US-3 operates in confined areas where precision is a safety requirement. Original pumps provide the micro-metering necessary for safe, slow-speed operation near utilities.

Metallurgical Endurance: Original cylinder blocks use high-silicon alloys that resist heat-soak and cavitation, ensuring a service life of 10,000+ hours with correct maintenance.

4. Professional Installation Protocol
To ensure the longevity of your new HPK060BT pump, our 13-year experience dictates these mandatory steps:

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

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

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

Air Purge: After startup, 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)
What is the difference between the -18A and -17B variants?
These designations usually refer to the specific regulator configuration or updated internal seal designs. While they are often interchangeable, we always verify your Machine Serial Number to ensure the specific control logic matches your machine's ECM.

How can I verify if the pump is an "Original Brand"?
Genuine units feature a factory data plate with the Hitachi or Hitachi Astemo (Nachi/Unisia) logo. The casting should be clean, and the pump is shipped with high-quality, heavy-duty protective port plugs.

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

Does the pump come with a warranty?
Yes, our Original Brand New pumps come with a factory-backed warranty, provided that the installation protocols (case priming and filter changes) are documented and followed.

Would you like a formal quote for the Original HPK060BT pump, or do you need help cross-referencing your Machine Serial Number?