KYB PSVD Series Hydraulic Pump | PSVD2-17E PSVD2-19E | Yanmar VIO75 Main Pump

LIC Hydraulic’s KYB (Kayaba) PSVD Series axial piston pumps are the ultimate “All-in-One” hydraulic heart for mini-excavators. Known for their legendary reliability in Japanese machinery, the PSVD2 series (including PSVD2-17E, PSVD2-19E, and PSVD2-26E-3) integrates two variable displacement piston pumps and one fixed displacement gear pump into a single, ultra-compact housing. We offer 100% Drop-in Interchangeability specifically for the Yanmar VIO75. Whether you are trenching or performing delicate utility work, our KYB-standard replacements ensure factory-level synchronization and fuel efficiency for your excavator.

Technical Specifications (Bulleted List)

• Series Framework: PSVD2 Series (Variable Displacement).

• Displacement Grades: 17cc, 19cc, 21cc, and 26cc (per circuit).

• Application Model: Specifically engineered for Yanmar VIO75 and 3.5–8 ton excavators.

• Rated Pressure: $24.5\text{ MPa}$ ($3550\text{ PSI}$).

• Peak Pressure: $30.0\text{ MPa}$ ($4350\text{ PSI}$).

• Design: Triple-circuit integration (Dual Piston + Single Gear).

Key Technical Advantages

• Compact Triple-Pump Integration: By combining the main circuits and the pilot pump into one unit, the PSVD series saves critical space in the compact engine compartments of machines like the Yanmar VIO75, while simplifying hydraulic hose routing.

• Total Power Control: The internal regulator adjusts the flow of both piston circuits based on total engine load, preventing stalls and maximizing the hydraulic power available for simultaneous multi-function movements.

• High-Durability Rotating Groups: Featuring hardened alloy steel pistons and valve plates, these pumps maintain tight internal clearances even at high temperatures, ensuring sustained volumetric efficiency over a long service life.

• Reduced Hydraulic Ripple: Optimized port plate timing significantly lowers noise and vibration levels, making it the ideal choice for urban construction environments where noise regulations are strict.

Application Areas

• Mini-Excavators: Primary power for Yanmar VIO75, VIO55, and various high-performance 5–8 ton models from top Japanese brands.

• Specialized Compact Machinery: Driving track systems and implement circuits in compact drill rigs and loaders.

Expert Maintenance Tips

• Critical Priming: After installing the PSVD2-26E-3, you must bleed the air and prime the case with fresh hydraulic fluid through the top port. Starting a KYB pump “dry” will destroy the internal swashplate-slipper interface within seconds.

• Monitor Pilot Pressure: Since the pilot gear pump is integrated into the PSVD assembly, any “sluggish” machine response should be investigated by checking the pilot circuit pressure first (typically $35\text{–}40\text{ bar}$).

• Strict Filtration: KYB piston pumps are sensitive to particulate contamination. Maintain hydraulic fluid cleanliness at ISO 4406 18/16/13 to protect the precision-lapped surfaces of the valve plate and cylinder block.

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