421AK00564B ADU062 Eaton 420 Hydraulic Piston Pump 62.3cc 280bar

Product Overview

The 421AK00564B (corresponding to model code ADU062L05AB13A2714000A20) is a high-precision, fully interchangeable replacement for the Eaton (formerly Vickers) 420 Series open-circuit axial piston variable displacement pump. Designed for mobile equipment, this ADU062 unit offers 62.3 cm³/r displacement and 280 bar continuous pressure rating, with fast-response high-efficiency control options. It features a saddle-type swashplate with steel-backed polymer bearings for low noise, long life, and compact installation. Every unit undergoes 100% simulated operating condition testing to ensure exact dimensional, interface, control, and performance interchangeability with the original Eaton ADU062—enabling true drop-in replacement without modification.

Technical Specifications

• Model: 421AK00564B / ADU062L05AB13A2714000A20 (Eaton 420 Series ADU062)
• Displacement: 62.3 cm³/r (3.80 in³/r)
• Continuous Rated Pressure: 280 bar (4060 psi)
• Intermittent Pressure: 320 bar (4600 psi)
• Peak Pressure: 350 bar (5000 psi, momentary)
• Maximum Speed (at 1 bar abs inlet): 2600 rpm
• Maximum Standby Speed: 3600 rpm
• Minimum Speed: 600 rpm
• Theoretical Maximum Power: approx. 75.6 kW (101.3 hp)
• Theoretical Maximum Torque: approx. 278 Nm (205 lb-ft)
• Control Type: Pressure and flow compensator with torque limiting/load-sensing options, left-side load-sense port, bleed-down orifice, etc.
• Rotation: Left-hand (counterclockwise)
• Mounting Flange: SAE B 2-bolt
• Shaft: 13-tooth 16/32 pitch spline
• Ports: Side ports (suction 2″ Code 61 flange, pressure 1″ Code 61 flange)
• Weight (single seal approx.): 23.8 kg
• Circuit Type: Open circuit

Key Technical Advantages

1. Saddle-Type Swashplate with Steel-Backed Polymer Bearings: Reduces wear and internal loading, significantly extending bearing life and rigidity under the frequent shock loads typical of mobile equipment.
2. Fast-Response Controls and High Efficiency: Pressure/flow compensation and torque-limiting options deliver industry-leading response and recovery times, reducing cooling requirements and improving overall system efficiency.
3. High Pressure in a Compact Package: 280 bar continuous rating combined with a compact design saves installation space while maintaining high power density.
4. Low Noise and Long-Life Rotating Group: Optimized valve plate and piston design minimizes noise and pulsation; B10 bearing life reaches thousands of hours under rated mobile conditions.
5. Full Interchangeability and Rigorous Testing: 100% simulated condition testing guarantees exact match of mounting interfaces, shaft ends, and control ports to original equipment, minimizing downtime and retrofit costs.

Application Areas

• Main hydraulic systems of construction and mobile equipment (loaders, excavator auxiliaries, cranes)
• Agricultural and forestry machinery open-circuit power units
• Material handling and specialty vehicle hydraulic systems
• Mobile open-circuit applications requiring medium-to-high pressure and fast-response variable control
• Direct replacement for original Eaton 420 Series ADU062 pumps

Expert Maintenance Tips

• Ensure absolute inlet pressure meets requirements (recommended ≥0.85–1.0 bar) and size suction lines adequately to prevent cavitation.
• Fully bleed the system before initial start-up and verify control and case drain pressures.
• Maintain fluid cleanliness at ISO 4406 18/16/13 or better; recommended viscosity 16–40 cSt; replace filters regularly.
• Avoid prolonged simultaneous operation at peak pressure and maximum speed to maximize bearing and valve-plate life.
• Use correct seal kits (single or dual seal options) during service; check maximum displacement stop settings.
• Periodically inspect the swashplate bearings and piston assembly for wear and operate within recommended temperature ranges.