Rexroth 31 series A10VO28 Variable hydraulic pump

While often termed a pressure-compensated pump, the A10VO28’s standard control (like the DFR1) embodies adaptive load-sensing intelligence. It functions as a continuous comparator, measuring the system's actual workload pressure against the pump's output. Once the demand is met—such as when a cylinder reaches its stall point or a motor is holding under load—the control valve instantly redirects hydraulic pilot flow to destroke the swashplate. This action reduces geometric displacement to the minimal level needed to hold pressure, slashing flow output and converting the pump into a low-power standby state. This inherent load adaptation is the cornerstone of its legendary efficiency, drastically reducing hydraulic heat generation and prime mover energy consumption.

Strategic Advantages & System Optimization

Deploying the A10VO28 effectively requires moving beyond basic specifications to leverage its inherent performance and durability benefits within a holistic system design.

Transformative Energy Efficiency & Thermal Management

The prime advantage is dramatic energy conservation. In contrast to fixed-displacement pumps that generate constant flow—diverting excess over a relief valve as wasted heat—the A10VO28’s destroking capability is transformative. Consider a plastic injection molding machine's holding phase: the pump maintains full clamp tonnage (e.g., 280 bar) while delivering only the minute flow required to compensate for internal leakage. This can reduce the hydraulic power draw by over 80% during this phase, directly lowering electricity costs and minimizing the required capacity of cooling systems.

Engineered Durability for Demanding Environments

The 31 Series is built for endurance. Its rotating group—featuring a hardened cylinder block and piston assembly running on a hydrostatically lubricated valve plate—is optimized for high volumetric efficiency and long service intervals. While its design offers robust contamination tolerance, fluid cleanliness is the paramount determinant of service life. Adhering to Rexroth’s stringent filtration guidelines (maintaining ISO 4406 19/17/14 or cleaner) is the most critical maintenance action to prevent control valve stiction, port plate wear, and premature failure, ensuring maximum return on investment.

Industry-Specific Applications & Implementations

The A10VO28’s blend of compact power and smart control makes it a preferred solution across diverse sectors.

• Mobile Off-Highway Equipment: Essential in compact wheel loaders, telehandlers, and aerial access platforms. Its load-sensing capability provides precise, metered control of attachments without jerky movements, enhances operator control, and reduces diesel engine fuel consumption by eliminating parasitic pump loads.

• Industrial Manufacturing Systems: Widely implemented in clamping units of injection molding machines and die-casting cells. The pump delivers rapid closing speeds at low pressure and then seamlessly transitions to high-pressure, low-flow holding, optimizing cycle times and energy use per part. It is also prevalent in smaller hydraulic presses and machine tool auxiliaries.

• Testing & Simulation: The pump’s precise and stable pressure control makes it ideal for material fatigue test stands, component validation rigs, and flight simulator motion bases. Its ability to faithfully replicate complex pressure profiles with high repeatability is invaluable for R&D and certification environments.

System Integration Philosophy & Proactive Troubleshooting

Foundational Integration Principles

To unlock the pump's full potential, system design is critical. A properly sized supercharge (feed) pump—typically an internal gear type—is non-negotiable. It ensures positive inlet pressure to the main pump’s suction line, prevents cavitation, and provides cooling flow. The main system relief valve should be calibrated approximately 10-15% above the pump’s pressure compensator setting to serve as a true safety backup. Implementing a high-beta ratio return line filter and correctly sizing the reservoir and air-to-oil heat exchanger are essential for maintaining fluid integrity and managing the system’s thermal balance.

For more information on the A10VO28 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: My A10VO28 pump is running loudly and hot. What are the likely causes?

A1: Excessive noise and heat are classic symptoms of cavitation or aeration. First, check the suction line for restrictions, leaks, or a clogged inlet filter. Ensure the charge pressure is within specification (typically 7-12 bar). Also, verify the fluid viscosity is correct for the operating temperature.

Q2:Can I adjust the pressure setting on the pump's control valve myself?

A2:Yes, but with caution. The pressure setting adjustment is typically a screw with a locknut. Always connect a calibrated pressure gauge directly at the pump's pressure port.​ Slowly adjust the screw while cycling the system to the point of relief. Do not exceed the maximum allowable pressure rating for the pump or other system components. Improper adjustment can be dangerous and lead to component failure.

Q3:How to purchase an A10VO28 hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the A10VO28 hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.