KYB VIO70 172187-73100 hydraulic pump for Yanmar VIO60 VIO70 excavator
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Component: Main Hydraulic Variable Displacement Axial Piston Pump Assembly
Manufacturer Model Number: KYB PSVD2-27E-21 (PSVD Series Architecture)
Yanmar OEM Part Numbers: 172187-73100, 172989-73100 (17218773100, 17298973100)
Machine Compatibility:
Yanmar VIO60 / VIO60-1 / VIO60-2
Yanmar VIO70 / VIO70-1 Mini Excavator
Condition: Genuine Original New / Premium OEM Specification Equivalent
2. Technical Specifications
Pump Type: Multi-Section Variable Displacement Axial Piston Pump with Auxiliary Gear Pump
Flow & Pressure Performance: Factory-engineered displacement thresholds, flow profile, and operating pressure parameters (up to 24.5 MPa / 245 bar) matched specifically to Yanmar 6 to 7-ton mini excavator circuits.
Integrated Control Network: Features load-sensing flow regulators to balance fluid delivery across digging, swing, and travel functions without causing engine lugging.
Drive Interface: Heavy-duty input drive shaft and precision flange engineered to couple directly with the engine flywheel dampener.
3. Critical Installation Requirements
Hydraulic Pump Housing Priming (Mandatory)
Before starting the engine, manually 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 slippers, 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 purge any trapped air from the hydraulic loop.
Fluid & System Decontamination
If replacing a pump that suffered internal mechanical failure, completely drain and clean the main hydraulic oil reservoir, flush all circuit lines, and clean the oil cooler. Replace all return and suction filter elements before starting the engine.
Pilot & Main Relief Pressure Inspection
Verify system pressure relief valve settings upon startup. Incorrect pressure settings can lead to sluggish hydraulic response, circuit overheating, or engine stalling under heavy load.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 172187-73100 and 172989-73100 fully interchangeable?
A: Yes. These part numbers represent standard Yanmar factory revisions and supersessions across the VIO60 and VIO70 model lines. All cross-reference to the KYB PSVD2-27E-21 platform with identical mounting dimensions, input shaft splines, and hydraulic port locations.
Q: My Yanmar VIO70 bogs down or stalls the engine when performing multi-function movements. Is the pump failing?
A: Engine lugging or stalling under heavy load usually indicates worn internal valve plates or sticking pump regulators failing to destroke output as pressure spikes. Installing a replacement pump assembly restores balanced power distribution.
Q: Does the 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: Preserved with rust-inhibiting storage oil, fitted with heavy-duty port plugs, and packed inside an export-safe protective crate or box.
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.