PVD-0B-18P Nachi Split Flow Piston Pump 24.5MPa

Product Overview

The PVD series from Nachi comprises split-flow variable axial piston pumps, covering models PVD-0B, PVD-2B and specific codes such as PVD-0B-18P-6G3, PVD-0B-18P-6G3-4191A and PVD-0B-24P-8G-4900A. Features a single-housing dual-flow design that delivers two equal independent flows to ensure straight-line travel of crawler undercarriages. Suitable for Hitachi EX45, EX45-1, EX55, AX45 and similar machines. Manufactured to exact OEM dimensions and interfaces for 100% drop-in interchangeability. Every unit undergoes 100% simulated operating-condition testing to verify pressure, flow and sealing integrity under the demanding conditions of compact construction equipment.

Technical Specifications 

• Models: PVD-0B / PVD-2B (examples: PVD-0B-18P-6G3, PVD-0B-24P-8G-4900A)
• Pump Type: Split-flow variable axial piston pump (dual piston flow + optional gear/pilot sections)
• Maximum displacement: PVD-0B approx. 12×2 = 24 cm³/rev; PVD-2B approx. 22.5×2 = 45 cm³/rev
• Rated pressure: 24.5 MPa
• Peak pressure: approx. 27 MPa
• Maximum speed: 2800 rpm (PVD-0B); 2600 rpm (PVD-2B)
• Control method: Constant horsepower control / load-sensing compatible
• Weight: approx. 13–20 kg (PVD-0B approx. 13 kg, PVD-2B approx. 20 kg)
• Applicable machine weight: approx. 1.5–5.5 ton class

(Data sourced from Nachi PVD series technical documentation.)

Key Technical Advantages

• Split dual-flow design: Single pump delivers two equal independent flows, ensuring straight-line travel of crawler undercarriages without frequent operator correction.
• Compact lightweight construction: Optimized housing and rotating group provide low weight and short overall length for tight engine compartments of mini excavators.
• Low noise and low pulsation: Precision swash plate and valve plate design reduces pressure ripple and operating noise for improved operator comfort.
• 100% drop-in interchangeability and simulated testing: Mounting interfaces match OEM exactly; full duty-cycle validation before shipment ensures sealing integrity and minimizes downtime.

Application Areas

Main hydraulic systems of Hitachi EX45, EX45-1, EX55, AX45 mini excavators and similar compact construction machines from JCB and other brands for travel and working equipment functions.

Expert Maintenance Tips

Clean ports and drive shaft thoroughly before installation. Use recommended hydraulic oil and verify system cleanliness. Pre-fill the case with oil before start-up. After replacement, run at low speed under no load, then gradually increase load while checking for noise or leakage. Regularly monitor case pressure and filters; avoid prolonged over-pressure or cavitation. Perform pressure and flow verification tests according to the official Nachi manual.