KYB PSVD2 Series Hydraulic Piston Pump | PSVD2-17E PSVD2-21E PSVD2-26E | Variable Displacement Pump for Mini Excavators

Product Overview

LIC Hydraulic’s KYB PSVD Series (including PSVD2-12E, 16E, 17E, 21E, and 26E) represents the pinnacle of compact high-pressure technology for mini-excavators. As an integrated triple-pump unit (dual variable displacement piston pumps plus auxiliary gear pumps), it provides the essential flow and pressure for track drive, swing, and boom functions. Our units are engineered for 100% interchangeability and undergo rigorous factory-simulated testing to guarantee that every pump delivers OEM-level performance in the most demanding site conditions.

Technical Specifications

• Model Codes: PSVD2 Series (PSVD2-12E / 16E / 17E / 21E / 26E)

• Piston Displacement: 12.0cc / 16.0cc / 17.4cc / 21.0cc / 26.0cc (×2)

• Gear Pump Displacement: 4.5cc to 10.8cc (Varies by model suffix)

• Rated Operating Pressure: 20.6 MPa (3000 PSI)

• Peak Pressure: 24.5 – 30.0 MPa (3550 – 4350 PSI)

• Rated Speed: 2000 – 2600 rpm

• Control Type: Total Horsepower Control / Load Sensing

• Housing Material: High-tensile anti-fatigue cast iron

• Approx. Weight: 25kg – 35kg (Depending on configuration)

Key Technical Advantages

• Ultra-Compact Integrated Design: By housing multiple pump stages in a single casting, the PSVD series minimizes the footprint in the engine compartment, reducing hose complexity and potential leak points.

• Precision Swash Plate Mechanism: Features high-strength alloy steel swash plates and piston shoes with micro-lapped surfaces, ensuring smooth stroke variation and superior mechanical efficiency.

• Total Power Balancing: The integrated regulator valve balances the hydraulic load with the engine’s power curve, preventing stalling and optimizing fuel consumption during multi-function operations.

• Drop-in Replacement: All mounting flanges, shaft splines, and porting configurations are identical to original KYB specifications, ensuring a seamless field replacement.

Application Areas

• Mini Excavators: Primary main pump for 1.5-ton to 6-ton machines (e.g., Kubota, Yanmar, Takeuchi, IHI).

• Drilling Rigs: Reliable power source for compact rotary or horizontal directional drilling (HDD) equipment.

• Specialty Equipment: Multi-purpose skid steers and compact rollers requiring multi-circuit hydraulic flows.

Expert Maintenance Tips

• Pre-Filling Case: Before initial startup, fill the pump case with clean hydraulic oil through the highest drain port to prevent catastrophic failure of the rotating group due to lack of lubrication.

• Fluid Cleanliness: Maintain system oil cleanliness at ISO 4406 18/15/12 or better. KYB piston pumps are highly sensitive to abrasive particles that cause internal slippage.

• Air Bleeding: Run the engine at low idle for 5-10 minutes after installation to bleed air from the suction line. This prevents cavitation, which can pit the swash plate and piston heads.