Nachi PVD-00B-15-3-5658A 758842-86101 hydraulic pump for Yanmar VIO10-2A VIO12-2A excavator
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Component: Main Hydraulic Variable Displacement Axial Piston Pump Assembly
Manufacturer Model Number: Nachi PVD-00B-15-3-5658A (PVD Series Architecture)
Yanmar OEM Part Number: 758842-86101 (75884286101)
Machine Compatibility:
Yanmar VIO10-2A Mini Excavator
Yanmar VIO12-2A Mini Excavator
Condition: Genuine Original New / Premium OEM Specification Equivalent
2. Technical Specifications
Pump Type: Variable Displacement Axial Piston Pump with Auxiliary Gear Pump Section
System Performance: Factory-calibrated flow rate, displacement, and pressure output matching Yanmar 1.0 to 1.2-ton sub-compact excavator hydraulic circuits.
Integrated Controls: Features factory-calibrated regulators to manage dual piston pump flow and auxiliary gear flow for smooth multi-function operation.
Interface Mount: Precision mounting flange paired with a heavy-duty input spline shaft designed to couple directly with the engine flywheel dampener drive.
3. Critical Installation Requirements
Hydraulic Pump Housing Priming (Mandatory)
Before cranking the engine, manually pre-fill the main pump casing with clean, fresh hydraulic fluid through its highest case drain port. Running an axial piston pump dry—even for a few seconds—will score the valve plate and piston shoes, causing immediate total pressure loss.
Air Bleeding & Initial Startup Procedure
After installation, loosen the air bleed port on top of the pump housing. Crank the engine with the fuel supply disabled until clear, bubble-free oil flows from the port, then retighten. Allow the machine to idle under no load for 10 to 15 minutes to clear any trapped air in the main hydraulic loop.
Fluid & System Decontamination
If replacing a pump that suffered internal mechanical failure, completely drain and clean the hydraulic oil reservoir, flush circuit lines, and clean the oil cooler. Replace all return and suction filter elements before starting the engine.
Pilot & System Pressure Inspection
Verify system pressure relief valve settings upon startup. Incorrect pressure relief settings can lead to sluggish hydraulic response, circuit overheating, or engine stall under heavy load.
4. Frequently Asked Questions (FAQ)
Q: Is the Nachi PVD-00B-15-3-5658A a direct drop-in replacement for Yanmar part number 758842-86101?
A: Yes. Nachi is the original hydraulic pump manufacturer for these Yanmar sub-compact models. Part number 758842-86101 cross-references directly to this Nachi PVD-00B unit, ensuring identical mounting bolt patterns, hose port threads, and performance ratings.
Q: My Yanmar VIO10-2A loses hydraulic speed or bogs down the engine during combined travel and boom functions. Is the main pump failing?
A: Sluggish operation across multiple functions or engine lugging often indicates that internal wear plates have scored or that the pump load-sensing regulators are no longer tracking properly. Replacing the main pump assembly restores factory flow distribution and pressure control.
Q: Does this unit arrive complete with the rear gear pump section attached?
A: Yes. The unit comes fully assembled as a single integrated pump assembly, including the main axial piston pump section, factory-adjusted regulator blocks, and the auxiliary gear pump section.
5. Shipping & Logistics
Packaging: Coated with rust-inhibiting storage oil, sealed with heavy-duty port plugs, and packed inside an export-safe protective box or crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days directly to your workshop or job site.