Nachi PVD Series Piston Pump | PVD-00B PVD-1B PVD-2B PVD-3B | PVD-15B-32BP

The Nachi PVD Series from LIC Hydraulic is the industry-leading solution for Mini Excavator Main Pumps. Known for their “double pump plus gear pump” integrated architecture, models like PVD-1B, PVD-2B, and the specific PVD-15B-32BP-9AG5-4634G provide the essential hydraulic power for track drives, boom movements, and pilot controls from a single, compact unit. We offer 100% drop-in replacements for original Nachi PVD units, ensuring that your machinery regains its factory-standard speed, lifting power, and fuel efficiency.

Technical Highlights

• Design: Integrated Dual Variable Displacement Piston Pump + Gear Pump.

• Frame Sizes: PVD-00B (1-2 tons), PVD-1B (2-3 tons), PVD-2B (3.5-4.5 tons), PVD-3B (5-6 tons).

• Max Pressure: Up to $25\text{ MPa}$ ($250\text{ bar} / 3625\text{ psi}$).

• Control: Pressure compensator and load-sensing capability.

Core Advantages

• Ultra-Compact Architecture: By housing two main piston pumps and one or two auxiliary gear pumps in one casting, the PVD series minimizes the footprint and simplifies the plumbing within the tight engine compartments of mini excavators.

• Precision Fluid Distribution: Engineered to support multi-functionality, allowing operators to travel and excavate simultaneously without hydraulic flow interference or power drops.

• High Volumetric Efficiency: Precision-lapped valve plates and hardened pistons ensure minimal internal leakage, maintaining high performance even as hydraulic temperatures rise during long work shifts.

• Rugged Reliability: Built to withstand the high-frequency pressure spikes inherent in trenching and demolition work, with heavy-duty bearings for extended service life.

Expert Maintenance Tips

• Oil Grade and Filtration: PVD pumps have very tight tolerances. Always use high-quality ISO VG46 or VG32 hydraulic oil and maintain cleanliness at ISO 18/16/13. A contaminated filter is the leading cause of PVD pump failure.

• Air Bleeding is Mandatory: After replacing a PVD pump, the case MUST be filled with oil and air bled from the top vent before startup. Running these pumps “dry” for even 30 seconds will cause catastrophic damage to the rotating group.

• Suction Line Integrity: Given that one suction port often feeds multiple pump sections, any air leak in the suction hose will lead to severe cavitation and “whining” noise across all functions.