PSVD2-21E KYB Variable Piston Pump 24.5MPa Mini Excavator

Model Number	PSVD2-21E-23

Product Overview

The PSVD series from KYB (Kayaba) comprises multi-circuit variable axial piston pumps, covering models PSVD2-17E, PSVD2-21E, PSVD2-26E and specific codes such as PSVD2-21E-23. Designed for 2–5 ton mini excavators, each unit integrates dual variable piston pumps, a gear pump and a pilot (trochoid) pump in one compact housing. Suitable for Yanmar VIO50, VIO55, VIO60-6B and similar machines. Manufactured to exact OEM dimensions and interfaces for 100% drop-in interchangeability. Every unit undergoes 100% simulated operating-condition testing to verify pressure, flow and sealing integrity under the demanding conditions of compact construction equipment.

Technical Specifications

Models: PSVD2-17E / PSVD2-21E / PSVD2-26E (example: PSVD2-21E-23)

Pump Type: Multi-circuit variable axial piston pump (dual piston + gear + pilot)

Piston pump displacement: approx. 17.9–20.8 cm³/rev × 2 (PSVD2-21E); other sizes approx. 14–28 cm³/rev

Rated pressure: 24.5 MPa

Peak pressure: approx. 27 MPa

Maximum input speed: 2400 rpm (PSVD2-21E)

Control method: Total horsepower control / load-sensing compatible

Weight: approx. 23–36 kg (PSVD2-21E approx. 26 kg)

Applicable machine weight: 3.5–4.5 ton class

(Data sourced from KYB PSVD series technical documentation and Yanmar equipment specifications.)

Key Technical Advantages

Compact multi-circuit integrated design: Dual piston pumps + gear pump + pilot pump in a single housing dramatically shortens overall length for tight engine compartments of mini excavators.

Low noise and low pulsation: Optimized swash plate and valve plate design effectively reduces pressure ripple and operating noise.

High volumetric efficiency and long service life: Precision piston-shoe pairs and wear-resistant materials ensure stable output and durability under high pressure.

100% drop-in interchangeability and simulated testing: Mounting interfaces match OEM exactly; full duty-cycle validation before shipment ensures sealing integrity and minimizes downtime.

Expert Maintenance Tips

Clean ports and drive shaft thoroughly before installation. Use recommended hydraulic oil and verify system cleanliness. Pre-fill the case with oil before start-up. After replacement, run at low speed under no load, then gradually increase load while checking for noise or leakage. Regularly monitor case pressure and filters; avoid prolonged over-pressure or cavitation. Perform pressure and flow verification tests according to the official KYB/Yanmar manual.

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