Vickers 421AK Series Hydraulic Pump | 421AK00463B, 421AK00294A, 421AK00791B | Piston Pump
| Model Number | 421AK, 421AK00463B, 421AK00294A, 421AK00791B |
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Product Description
Vickers 421AK Series (ADU) Axial Piston Variable Displacement Pump
Product Overview: The Eaton Vickers 421AK series (also designated as the ADU series) is a high-efficiency axial piston variable pump engineered for open-circuit mobile and industrial applications. This series is a staple in tractors, harvesters, material handling machinery, and medium-duty industrial power units. Renowned for its exceptionally rugged cast-iron housing and high power density, the 421AK range—from the 421AK00463B to the 421AK00791B—provides stable, long-lasting hydraulic power even in the most demanding operating environments.
Key Technical Advantages:
Heavy-Duty Shock Resistance: The 421AK series features reinforced swashplate supports and high-strength rotating components. Models like the 421AK00294A are optimized for the frequent pressure fluctuations common in mobile machinery, ensuring structural integrity under stress.
Precise Compensator Control: Equipped with advanced Pressure Compensators. Once the system pressure reaches a preset value, the pump automatically de-strokes, reducing unnecessary energy loss and significantly lowering hydraulic fluid temperatures.
Low Noise & Vibration: Acoustically optimized internal flow paths maintain minimal decibel levels even at rated pressures, making it ideal for agricultural and construction vehicles where cabin quietness is a priority.
100% Industrial Interchangeability: Manufactured strictly to Vickers OEM specifications. Models like the 421AK00463B are a direct “drop-in” match for original equipment, drastically reducing downtime for maintenance and system upgrades.
Specific Models & Technical Parameters:
Core Series: 421AK, ADU Series.
Detailed Config Codes: 421AK00463B, 421AK00294A, 421AK00791B.
Displacement Range: 41cc to 80cc depending on specific configuration.
Pressure Specifications: Rated operating pressure 210 Bar (21 MPa); Peak cycles up to 280 Bar.
Mounting Interface: Compliant with standard SAE specifications, available with various shaft and flange options.


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