Nachi PVD-1B-23L3-7G-2232B Main Pump | Excavator Hydraulic Pump Parts | PVD-1B Series

The Nachi PVD-1B Series from LIC Hydraulic is the industry-standard main pump for mini-excavators in the 1.5 to 3.5-ton range. Models like the PVD-1B-23L3-7G-2232B are engineering marvels that integrate two axial piston pumps and auxiliary gear pumps into a single, compact housing. This design provides the essential multi-functionality required for simultaneous tracking, swinging, and arm movement. We provide 100% drop-in replacements for complete pump assemblies and premium-grade internal repair parts, including rotating groups, swash plates, and seal kits.

Technical Highlights

• Type: Integrated Axial Piston Pump + Gear Pump.

• Max Pressure: 210–250 bar (3045–3625 psi).

• Application: Primary hydraulic power for mini-excavators.

• Serviceability: Fully rebuildable with LIC high-precision internal components.

Core Internal Components

• Piston Set (10 pcs/set): Hardened surface coating to withstand rapid stroking under high pressure.

• Cylinder Barrel: Lapped to micron-level precision for zero internal leakage.

• Valve Plate (Left & Right): Balanced port design to minimize hydraulic noise and ripple.

• Support & Swash Plate: Robust alloy construction to handle continuous load cycles without deformation.

Key Advantages

• Space-Saving Architecture: By consolidating multiple pumps, it reduces the complexity of the engine bay and simplifies the overall hydraulic circuit.

• High Volumetric Efficiency: Precision-machined internal rotating groups ensure that maximum power is delivered to the actuators with minimal heat generation.

• OEM Compatibility: Specifically designed to match the mounting footprints and performance curves of major manufacturers like Kubota, Yanmar, and IHI.

Expert Maintenance Tips

• System Contamination: Micro-excavators have small oil reservoirs. Even minor contamination can cause the PVD pump to score the valve plate quickly. Always change the return filter when replacing pump parts.

• Case Priming: Before starting the engine after a pump rebuild, you MUST fill the pump case with clean hydraulic oil. A dry start will destroy the piston shoes and cylinder block surface in seconds.

• Pilot Pressure Check: Ensure the pilot system pressure is within OEM specs, as it directly affects how the PVD pump’s displacement control responds to operator input.