Product Overview The Nachi PVK Piston Pump is engineered to deliver high power in a small footprint. Its unique internal structure reduces friction and leakage, ensuring smooth operation even under heavy digging loads. The PVK-20/22/23 models are typically equipped with a regulator that allows for Constant Horsepower Control and Load Sensing, helping to optimize the engine’s fuel efficiency while maintaining maximum digging force.
Why Choose Nachi PVK Series?
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Compact & Lightweight: Designed to fit into the tight engine compartments of mini excavators.
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Stable Performance: The swashplate design ensures consistent flow output and minimal pulsation, protecting the machine’s hydraulic circuits.
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Energy Saving: Integrated control valves adjust flow based on load, reducing wasted energy and heat generation.
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OEM Quality: Direct replacement for the original main pumps found in many Japanese mini excavators.
Common Applications:
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Hitachi: ZX20, ZX25, ZX30, ZX35
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Kobelco: SK20, SK25, SK30
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Takeuchi: TB series mini excavators
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Other: Yanmar, Kubota compact machines
| Specification | Value / Description |
| Product Type | Variable Axial Piston Pump |
| Series | PVK Series (PVK-0B / PVK-1B / PVK-2B) |
| Model References | PVK-20 / PVK-22 / PVK-23 (Aftermarket Codes) |
| Displacement ($V_g$) | 20.0 – 28.0 cm³/rev (Typical for this class) |
| Rated Pressure | 24.5 MPa (245 bar / 3550 psi) |
| Peak Pressure | 26.0 MPa (260 bar) |
| Max. Speed | 2600 – 2800 rpm |
| Control Type | Load Sensing (LS) + Constant Power |
| Rotation | Clockwise (R) |
| Common Part Numbers |
PVK-2B-505 (Larger 4-5T class, often cross-referenced) PVK-0B-22 (Standard 22cc) PVK-1B-28 (Standard 28cc) Hitachi 4421728 (Cross Ref) Hitachi 4268672 (Cross Ref) PVD-00B-16P (Related split-flow model) Note: Please confirm the specific machine model (e.g., ZX30U) for exact part matching. |
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