Komatsu PC26MR-3 ミニエキスカベータのためのNachi PVK-0B-226G-PK-4220A 22K-60-21301 油圧ポンプ

Nachi PVK-0B-226G Hydraulic Main Pump for Komatsu PC26MR-3 | OEM 22K-60-21301 708-3S-00512

1. Product Overview
The Nachi PVK-0B-226G is a high-performance variable displacement axial piston pump integrated with a gear pump section. This "load-sensing" design is the "heart" of the Komatsu PC26MR-3, providing simultaneous and independent power to the boom, arm, bucket, and travel circuits. The PVK series is renowned for its high power density and compact footprint, making it ideal for the tight engine compartments of Komatsu's Minimum Radius (MR) machines.

2. Comprehensive OEM Part Number Compatibility
This pump is a 100% direct "bolt-on" replacement for the following Komatsu factory part numbers and Nachi specifications:

Komatsu Part Numbers:

22K-60-21301 / 22K6021301

708-3S-00512 / 7083S00512

708-3S-00511 / 7083S00511

Nachi Model Code:

PVK-0B-226G-PK-4220A

Machine Fitment:

Komatsu PC26MR-3

Komatsu PC26MR-3-B

(Also found on select PC20MR-3 and PC27MR-3 variants; please verify via serial number).

3. Technical Specifications & Performance
Manufacturer: Nachi-Fujikoshi (Japan OEM).

Pump Type: Variable Displacement Axial Piston Pump + Integrated Gear Pump.

Operating Pressure: Rated for high-pressure operation (nominal 250 bar) to maintain original factory breakout and lifting forces.

Control System: Integrated load-sensing regulator designed to optimize fuel efficiency by matching pump output to the operator's joystick demand.

Flow Sharing: Engineered for Komatsu’s CLSS (Closed-center Load Sensing System), ensuring that hydraulic functions do not interfere with one another during multi-tasking.

4. Why Partner With a 13-Year Industry Expert?
Technical Synchronization: We understand the specific flow curves required for Komatsu’s MR series. Our pumps are pre-set to factory specifications, restoring "factory-spec" cycle times.

100% Bench Testing: Every PVK-0B unit undergoes a rigorous hydraulic test. We verify flow rates, pressure compensation accuracy, and case drain leakage limits under full load.

OEM Reliability: We provide Original Nachi New units featuring hardened cylinder blocks and precision-lapped valve plates, offering significantly higher durability than generic aftermarket alternatives.

Global Rapid Logistics: Units are secured in reinforced, shock-proof export packaging. Express delivery via DHL, FedEx, or UPS typically arrives in 3 to 7 business days.

5. Critical Installation & Maintenance Protocol
Case Priming (Mandatory): You must fill the pump housing with clean, fresh hydraulic oil through the highest case drain port before starting the engine. Running a piston pump "dry" will cause catastrophic failure of the piston shoes and swash plate within seconds.

System Decontamination: If the previous pump failed mechanically (sending metal shavings into the system), you must flush the hydraulic tank, lines, and oil cooler. Residual metal fragments are the leading cause of failure for replacement pumps.

Filter Change: Always install a new high-efficiency hydraulic return filter and suction strainer. Ensure the oil meets ISO VG46 anti-wear standards.

6. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number (found on the chassis plate) or a photo of the data plate on your existing pump.

Instant Quote: Contact us today for up-to-date pricing, availability, and tiered quality options.

Technical Guidance: Our expert team is available 24/7 to provide professional advice on installation, air bleeding, and hydraulic troubleshooting.