PVD-15B-32BP-9AG5-5116B NACHI Split-Flow Piston Pump

Product Overview

The NACHI PVD Series is a split-flow variable piston pump developed for compact and mini-excavator hydraulic systems. NACHI’s official documentation describes a design that delivers two equal-flow outputs from one pump assembly, supporting straight-line travel performance while saving installation space. The series also uses standard constant-horsepower control to make more effective use of engine power under changing hydraulic loads.

The requested models are:

• PVD-15B-32BP-9AG5-5116B
• PVD-15B-32BP-9AG5-4634J
• PVD-0B-19L3PS-8G-4609F

These part numbers are found in aftermarket and construction-equipment parts databases as NACHI PVD hydraulic pump references. However, the complete suffix configurations are not individually decoded in the current public NACHI technical pages reviewed for this project. Therefore, exact displacement and complete suffix-specific speed data should be confirmed from the pump nameplate and OEM parts documentation before final specification approval.

For replacement applications, our engineering approach focuses on in-place interchangeability, correct hydraulic interfaces, control characteristics and installation geometry, followed by 100% simulated working-condition testing before shipment.

Technical Specifications

• Brand: NACHI / Nachi-Fujikoshi
• Product Series: PVD Series Piston Pump
• Pump Type: Variable displacement axial piston pump
• Architecture: Split-flow design with two equal-flow outlets
• Standard Control: Constant horsepower control
• Optional Functions: Gear pump, Power Shift, Valve Block
• Maximum Working Pressure: 24.5 MPa / approximately 245 bar for the published PVD series specification
• Rated vs. Peak Pressure: NACHI’s public PVD specification does not separately publish rated and peak pressure for these exact suffixes; therefore no artificial split is stated here.
• Displacement: Exact displacement for the complete PVD-15B-32BP-9AG5-* configurations is not independently verified in the reviewed NACHI public documentation.
• PVD-0B Speed Reference: NACHI’s published PVD-0B row shows 2800 r/min maximum speed and 2600 r/min rated speed, but this should not automatically be transferred to the exact PVD-0B-19L3PS-8G-4609F configuration without nameplate confirmation.
• Internal Drain: The current NACHI PVD product information identifies the PVD series as an internal-drain configuration.
• Exact Weight: Not published for the three complete suffixes in the reviewed official NACHI sources.
• Official PVD Series Reference Masses: PVD-00B 9 kg, PVD-0B 13 kg, PVD-1B 15 kg, PVD-2B 20 kg, PVD-3B 27 kg, excluding the optional gear pump.

Key Technical Advantages

1. Split-Flow Dual-Output Architecture

The PVD design combines two variable piston-pump functions into one compact housing and delivers two equal-flow outputs. This architecture is particularly useful where left and right travel circuits require balanced hydraulic supply.

2. Constant-Horsepower Control

NACHI’s PVD constant-horsepower system regulates displacement according to hydraulic load. Under lighter loads, higher flow supports faster machine operation; under heavier loads, displacement is reduced so engine power can be used more effectively.

3. Compact Installation

NACHI specifically positions the PVD Series for mini-excavator applications where engine-room space is limited. The integrated split-flow architecture reduces the packaging requirements associated with separate pump assemblies.

4. Modular Auxiliary Functions

The official NACHI documentation identifies optional gear pumps, Power Shift control and valve blocks. These options allow the pump assembly to support pilot circuits, auxiliary functions and integrated power management without relying exclusively on separate external components.

5. Engineering-Focused Replacement Quality

For replacement manufacturing, the critical quality points are not limited to external dimensions. They include piston/cylinder-block matching, valve-plate surface accuracy, swash-plate support, bearing alignment, shaft sealing and control-response stability.

Because NACHI’s public documents reviewed here do not disclose exact material grades for these complete legacy configurations, no unsupported alloy specification is claimed.

Application Areas

Typical applications include:

• Mini excavators
• Compact excavators
• Zero-tail-swing or reduced-tail-swing excavators
• Compact construction machinery
• Hydraulic systems requiring balanced dual travel flow

Market cross-reference sources associate:

• PVD-15B-32BP-9AG5-5116B with Takeuchi TB235.
• PVD-0B-19L3PS-8G-4609F with Volvo EC25 / EC20-related applications and corresponding OEM cross-reference numbers.

These equipment matches should be treated as cross-reference information rather than a substitute for OEM documentation.

Expert Maintenance Tips

• Confirm both pump outlets independently during commissioning; do not judge pump health from a single outlet.
• Verify mounting flange, shaft connection, rotation, port arrangement and auxiliary-pump configuration before replacement.
• Inspect hydraulic oil cleanliness and look for metallic contamination after a pump failure.
• Check drive-shaft alignment and coupling condition before installing a replacement unit.
• Verify constant-horsepower response under controlled load rather than testing only at no-load conditions.
• After overhaul or replacement, perform pressure, flow, control-response, leakage, vibration and thermal checks.
• For aftermarket replacement units, use 100% simulated working-condition testing to validate actual operating behavior rather than relying only on dimensional inspection.

Engineering Verification Note

For SEO and product-page accuracy, the safest positioning is to market these three part numbers as NACHI PVD Series application-specific replacement pumps, while keeping the complete suffix-level displacement and speed values subject to nameplate/OEM confirmation.

In particular, do not write “32 cc/rev”, “19 cc/rev”, “38 cc/rev” or a specific weight directly into the final sales page merely because those numbers appear inside third-party listings or model strings. The NACHI official sources reviewed here do not provide enough evidence to make those exact claims for the three complete part numbers.