Eaton Vickers 70122 70422 70423 70523 70553 Series Piston Pump

LIC Hydraulic’s Eaton Vickers Series axial piston variable pumps (including 70122, 70422, 70423, 70523, and 70553) are the workhorses of the mobile hydraulic world. Engineered for open-loop systems, these pumps are renowned for their compact design and rugged durability. Models like the 70553-RAB are specifically designed to optimize fuel efficiency through Load Sensing technology, ensuring the pump only delivers the flow requested by the operator. We offer 100% Drop-in Replacements for the entire Eaton mobile piston pump line, providing you with a high-performance alternative that minimizes downtime and operational costs.

Technical Specifications (Quick Reference)

• Displacement Options: $12\text{ cc/rev}$ to $75\text{ cc/rev}$ ($0.75\text{–}4.5\text{ in}^3\text{/r}$).

• Operating Pressure: Rated up to $210\text{ bar}$ ($3000\text{ PSI}$), with peaks up to $280\text{ bar}$.

• Speed Capability: High-speed design (up to $3600\text{ RPM}$ for 70122).

• Controls: Pressure Compensator, Load Sensing (LS), Remote Controls.

• Interchangeability: Full compliance with SAE mounting standards and shaft configurations.

Key Technical Advantages

• Streamlined Housing: The short envelope size allows these pumps to fit into tight engine bays where space is at a premium, common in modern compact utility vehicles.

• Exceptional Volumetric Efficiency: Precision-machined cylinder blocks and pistons minimize internal leakage, maintaining high performance even as the oil temperature rises.

• Reduced Noise Signature: Internal dampening features and optimized porting reduce the “whine” typical of high-pressure piston pumps, improving operator comfort.

• Service-Friendly Design: The modular construction allows for easy access to the compensator and rotating groups, simplifying field maintenance and reducing long-term TCO (Total Cost of Ownership).

Application Areas

• Turf & Utility: Main power source for commercial mowers and utility vehicles.

• Construction: Auxiliary pumps for backhoes, loaders, and compact rollers.

• Agriculture: Steering and lift circuits for tractors and specialized harvesters.

Expert Maintenance Tips

• Case Drain Management: Always route the case drain line from the highest port on the 70553 pump directly to the reservoir. This ensures the pump remains submerged in oil and prevents air-pockets from damaging the swashplate bearings.

• Fluid Cleanliness: To extend the life of your Eaton Vickers pump, maintain oil filtration at ISO 4406 18/16/13 or better. Contaminants are the primary cause of cylinder-to-valve plate scoring.

• Avoid Over-Pressurization: Ensure the system relief valve is set at least $20\text{ bar}$ higher than the pump’s pressure compensator setting to prevent unstable control oscillations.

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