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Introduction to KYB (Kayaba) PSVD2-17E / PSVD2-17E-19 Hydraulic Main Pump
A: It is a variable displacement axial piston hydraulic main pump assembly manufactured by KYB (Kayaba, Japan), covering models PSVD2-17E (including the variant PSVD2-17E-19), with OEM part number B0600-16018. It serves as the core hydraulic power component for 3.5–5 ton mini excavators such as Yanmar VIO45 and VIO55.
By adjusting the swash plate angle combined with the servo regulator, it achieves precise control of displacement and flow, matches engine power to prevent overload, and integrates a fixed displacement gear pump (pilot/auxiliary circuit) to support multiple functions including digging, traveling, swinging, and hydraulic breaker operation.
A:
Main models: PSVD2-17E (standard version), PSVD2-17E-19 (solenoid-controlled version, suitable for VIO55 and other models);
OEM part number: B0600-16018 (original matching part number for complete machinery);
Yanmar original reference part numbers: 172961-73102 / 172961-73103 (interchangeable in some production batches).
A:
| Model | Structure Type | Displacement (cc/rev) | Rated Pressure (MPa) | Max Pressure (MPa) | Speed Range (rpm) | Suitable Ton Range | Typical Application Models |
|---|---|---|---|---|---|---|---|
| PSVD2-17E/17E-19 | Variable piston pump + fixed gear pump | Approx. 17–19 | 24.5 | 24.5 | 1500–2500 | 3.5–5 tons | Yanmar VIO45, VIO50, VIO55 series |
A:
- Precise variable control: Swash plate structure + servo regulator automatically adjusts displacement according to load, matches engine power, avoids overload, and ensures energy saving and high efficiency.
- High-pressure durable design: Core pressure-bearing parts (valve plate, slipper, cylinder block) use high-strength wear-resistant materials, with maximum pressure up to 24.5 MPa, suitable for continuous heavy-duty operation.
- Multi-pump multi-circuit: Combines variable piston pump (main operation) + fixed gear pump (pilot/auxiliary), capable of driving boom, arm, travel, swing and other mechanisms simultaneously to meet complex working requirements.
- Solenoid extension functions: PSVD2-17E-19 is equipped with built-in solenoid valves, supporting travel speed switching, boom priority, flow combining and other functions to improve operational flexibility.
- Standardized installation: Directly mounted to the engine flywheel housing with high coaxial drive efficiency; mounting interfaces fully match Yanmar VIO45/VIO55, making replacement and maintenance convenient.
A:
- Yanmar: VIO45, VIO50, VIO55 series mini excavators (primary matching models);
- Alternative references: Some 3.5–5 ton mini excavators such as Kubota KX35/KX40 and IHI 35 (installation interfaces and solenoid configuration must be verified).
