Nachi PVD-1B-29BP-12G5-4614F 172441-73100 hydraulic pump for Yanmar B25V B27 B30V-1 mini excavator
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1. Product Overview
The Nachi PVD-1B-29BP is a variable displacement axial piston pump integrated with a gear pump section. This "load-sensing" design is the core of the Yanmar B-series hydraulic system, providing simultaneous power to the boom, arm, bucket, and travel circuits. The 29cc displacement is specifically calibrated to match Yanmar's engine torque curves, ensuring high-speed cycle times without lugging the engine.
2. Comprehensive OEM Part Number Compatibility
This pump is a 100% direct "bolt-on" replacement for the following Yanmar factory part numbers and Nachi specifications:
Yanmar Part Numbers: 172441-73100, 172142-73100, 172422-73101, 172422-73100.
Nachi Model Code: PVD-1B-29BP-12G5-4614F (and related PVD-1B series sub-variants).
Machine Fitment:
Yanmar B25V (Standard and V-series)
Yanmar B27 (B27-2, B27-2B)
Yanmar B30V-1
Yanmar B3 (Select sub-models)
3. Technical Specifications & Performance
Pump Architecture: Variable Displacement Piston Pump + Integrated Pilot Gear Pump.
Displacement: 29cc/rev (Main Piston Section).
Max Pressure: Rated for continuous operation at 21.0 - 24.5 MPa (245 bar) to maintain factory breakout forces.
Control Valve: Integrated regulator for power-limiting and load-sensing, providing smooth, multi-function joystick response.
Shaft/Flange: Standard Yanmar-spec spline shaft and 2-bolt mounting flange for precise alignment.
4. Why Partner With a 13-Year Industry Expert?
Yanmar System Expertise: We understand the flow-sharing requirements of Yanmar's "ViO" and "B" series. Our pumps are pre-set to factory specifications, eliminating the need for complex field adjustments.
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.
OEM Material Quality: We provide Original Nachi New units featuring hardened cylinder blocks and precision-lapped valve plates, offering significantly higher durability than generic aftermarket "will-fit" pumps.
Global Rapid Logistics: Secured in reinforced, export-grade wooden crates. Delivery via DHL, FedEx, or UPS typically arrives in 3 to 7 business days.
5. Critical Installation & Maintenance Protocol
Case Priming (Mandatory): Before starting the engine, you must fill the pump housing with clean hydraulic oil via the highest drain port. Starting a dry pump will cause the piston shoes to "smear" against the swash plate, leading to immediate failure.
Oil Decontamination: If your old pump "grey-marked" the oil (metal shavings), you must flush the entire hydraulic system, including the tank and oil cooler. Failure to flush will destroy the new pump within the first 10 hours of operation.
Filter Replacement: Always install a new 10-micron return filter and a clean suction strainer. Use only high-quality ISO VG46 anti-wear hydraulic oil.
6. Ordering & Professional Support
Serial Number Check: To ensure 100% fitment, please provide your Machine Serial Number or a photo of the existing pump's data plate.
Instant Quote: Contact us today for current pricing, availability, and tiered quality options.
Technical Support: Our team is available 24/7 to assist with installation steps, air bleeding procedures, and hydraulic troubleshooting.