Eaton Vickers 622 620 421 Piston Pump | ADY098R05AB10A | 622AK

The Eaton Vickers 421 Series (including 620/622 models) from LIC Hydraulic is a series of robust Axial Variable Displacement Piston Pumps built for heavy-duty open-circuit applications. Models like ADY098R05AB10A and 622AK00201A have been the industry standard for mobile and industrial equipment for decades. We guarantee 100% mechanical interchangeability with original Eaton Vickers units. Each pump is subjected to 100% full-load bench testing to ensure it maintains superior volumetric efficiency and precise response under pressures up to $350\text{ bar}$.

Technical Specifications 

• Series: Eaton Vickers 421, 620, 622 Series

• Example Model: ADY098R05AB10A202000000100100GD0A

• Displacement: $41\text{ to }123\text{ cc/rev}$ (ADY098 is $98\text{ cc/rev}$)

• Nominal Pressure: $280\text{ bar}$ ($4000\text{ psi}$)

• Peak Pressure: Up to $350\text{ bar}$ ($5000\text{ psi}$)

• Control Type: Pressure Compensator, Load Sensing, Remote Pressure Control

• Configuration: SAE Mounts and Shafts with Thru-Drive capability

• Direction: Clockwise (R) or Counter-Clockwise (L)

Key Technical Advantages

• Heavy-Duty Rotating Groups: Engineered with high-strength materials, the internal pistons and slippers are designed to withstand rapid pressure cycles in harsh mobile environments without fatigue.

• Precision Control Logic: The advanced compensator (e.g., ADY098 series) matches engine power to hydraulic demand, minimizing heat generation and maximizing fuel economy for tractors and harvesters.

• High Self-Priming Speed: The optimized internal flow path allows for higher speeds in self-priming conditions, reducing the need for reservoir pressurization.

• Versatile Thru-Drive Capability: Allows for the stacking of additional gear or piston pumps (SAE A, B, or C), providing a compact solution for multi-circuit hydraulic systems.

Application Areas

• Agriculture: Main hydraulic pumps for harvesters, mowers, and large tractors.

• Construction: Motor grader steering/work circuits and vibratory roller drives.

• Forestry: Feller buncher grapples and timber processing heads.

• Industrial: HPUs, balers, and auxiliary power units for steel mills.

Expert Maintenance Tips

• Mandatory Case Priming: Always fill the pump housing with filtered oil through the highest drain port before startup. Running dry for even a few seconds will cause catastrophic wear on the rotating group.

• Purge LS Lines: For Load Sensing models, ensure the signal line is free of air. Entrapped air will lead to erratic pump behavior, sluggish response, and excessive noise.

• Check Case Pressure: Ensure the case drain pressure remains below $2\text{ bar}$ ($30\text{ psi}$). Excessive backpressure in the drain line will blow the shaft seal and destabilize the piston balance.