KYB OEM PSVD2-17E hydraulic pump for Yanmar VIO40-3 VIO40-2 VIO45-5 VIO50-3 VIO50-2 VIO55-3 VIO55-2 excavator
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1. GENERAL IDENTIFICATION
Machine Models: * Yanmar ViO40-2, ViO40-3
Yanmar ViO45-5
Yanmar ViO50-2, ViO50-3
Yanmar ViO55-2, ViO55-3
Yanmar Part Numbers: B0600-16023, B0600-16017, 172458-73100
OEM Manufacturer: KYB (Kayaba)
OEM Model Series: PSVD2-17E-18 / PSVD2-17E-19
Pump Architecture: 2 x Variable Piston + 2 x Gear (Integrated)
2. PERFORMANCE SPECIFICATIONS
Piston Pump Displacement (P1/P2): 17.2 cc/rev x 2
Gear Pump Displacement (P3/P4): Approx. 14.5 cc/rev + 4.5 cc/rev
Total Max Flow: Approx. 37.8 x 2 + 31.9 + 9.9 L/min (@ 2200 RPM)
Rated Pressure: 24.5 MPa (3,553 PSI)
Max Relief Pressure: 26.5 MPa (3,843 PSI)
Control System: Constant Pressure / Total Horsepower Control
3. INTERNAL COMPONENTS & REPAIR PARTS
The PSVD2-17E is a complex unit. Common rebuild parts include:
Rotary Group: Cylinder Block (Barrel), 10-Piston Set (5 per side for this specific PSVD revision), and Piston Retainer.
Valve Plate: Critical for timing; the "Right" and "Left" sides are usually mirrored.
Swash Plate & Support: Controls the displacement angle.
Drive Shaft: 13-Tooth or 15-Tooth Spline (Matches Yanmar engine coupling).
Seal Kit: High-pressure shaft seal, body O-rings, and gear pump interface seals.
4. FACTORY PRESSURE SETTINGS
Main Relief (Digging): 24.5 MPa
Travel Relief: 24.5 MPa
Swing/Blade Relief (P3): 20.6 MPa
Pilot Control (P4): 3.4 - 3.9 MPa
5. INSTALLATION & MAINTENANCE PROTOCOL
Case Priming: MANDATORY. Fill the pump case with clean hydraulic oil through the top drain port.
Bleeding Air: Loosen the air vent plug on top until oil flows without bubbles. Starting a "dry" pump will cause immediate failure of the valve plate.
Suction Check: Ensure the suction hose from the tank is not "soft" or collapsing.
Filtration: Replace the return filter (172458-62210) and clean the suction strainer.