Rexroth A10VD43 21W-60-22111 hidraulikus szivattyú Komatsu PC75UU-2 PC75UD-2 kotrógép-hoz

Rexroth A10VD43 Hydraulic Main Pump for Komatsu PC75UU-2 PC75UD-2 | OEM Part No. 21W-60-22111

1. Product Overview
The Rexroth A10VD43 is a tandem variable displacement axial piston pump designed for closed-center hydraulic systems. In the Komatsu PC75UU-2 (Ultra-Urban) and PC75UD-2 models, this pump is responsible for providing high-pressure oil to the entire workgroup and travel system. Its compact tandem design allows for independent control of multiple functions, ensuring that the machine can travel, swing, and operate the boom simultaneously without a loss in performance.

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

Komatsu Part Numbers:

21W-60-22111 / 21W6022111

21W-60-22110 / 21W6022110

21W-60-22112 / 21W6022112

Rexroth Model Code:

A10VD43SR1RS7-972-1

A10VD43 (Standard series suffix varies by machine year)

Machine Fitment:

Komatsu PC75UU-2

Komatsu PC75UU-2E

Komatsu PC75UD-2

3. Technical Specifications & Performance
Pump Architecture: Tandem Axial Piston (Two independent pumping groups in one housing).

Displacement: 43cc per section.

Max Working Pressure: Rated for continuous operation up to 28.0 - 30.0 MPa (300 bar).

Control System: Features an integrated Load Sensing (LS) and Pressure Compensator (PC) valve group. This ensures the pump only produces flow on demand, significantly reducing fuel consumption and heat generation.

Internal Durability: Features hardened cylinder blocks and precision-lapped valve plates designed to handle the high-cycle demands of urban excavation.

4. Why Partner With a 13-Year Industry Expert?
CLSS Calibration: We understand Komatsu’s Closed-center Load Sensing System (CLSS). Our pumps are pre-calibrated to factory specs, ensuring your machine tracks straight and the joystick response remains crisp.

100% Bench Testing: Every unit undergoes a rigorous hydraulic test. We verify flow rates at various RPMs, pressure compensation accuracy, and case drain leakage limits under maximum load.

OEM Material Quality: We provide Original Rexroth New or Premium OEM-spec units that utilize the same metallurgy as factory-installed pumps, providing a long service life at a competitive price point.

Global Rapid Logistics: Units are secured in reinforced, shock-proof export wooden crates. 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 the pump "dry" will cause immediate catastrophic failure of the piston shoes.

System Flushing: If the previous pump failed due to internal breakage (sending metal shavings into the system), you must flush the hydraulic tank, main control valve, and oil cooler. Residual debris is the primary cause of failure in replacement pumps.

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

Air Bleeding: After installation, run the engine at low idle and cycle all hydraulic functions without load for 10 minutes to purge air from the circuit.

6. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number or a photo of the nameplate 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, regulator adjustments, and hydraulic troubleshooting.