Rexroth 32 series A10VO71 hydraulic piston pump

In the architecture of high-performance hydraulic systems, the pump is the heart. Among the most versatile and widely specified hearts in mobile and industrial machinery is the Rexroth A10VO71, a 71 cm³/rev axial piston pump. Its brilliance lies not just in moving fluid, but in its intelligent adaptability. As a variable displacement, open-circuit pump, the A10VO71 doesn't just deliver power—it modulates it with precision, matching output exactly to system demand. This inherent efficiency, combined with Bosch Rexroth's legendary durability, makes it a cornerstone of modern hydraulic design, from the precise world of injection molding to the rugged environment of an excavator's engine bay.

Core Operating Principle: The Swashplate Mechanism

At its core, the A10VO71 operates on a time-tested yet supremely effective axial piston, swashplate principle. Multiple pistons are housed in a rotating cylinder block, driven by a common shaft. Their reciprocating stroke—and thus the pump's displacement—is governed by the angle of a fixed, angled swashplate. This is the genesis of its variability: a control device physically adjusts this swashplate angle. From a neutral, zero-degree position (zero flow) to its maximum angle, the pump can seamlessly vary its output flow up to its full 71 cm³/rev displacement, all while the input shaft speed remains constant. This elegant mechanism is the foundation of its on-demand power delivery.

Key Technical Data at a Glance

• Displacement: 71 cm³/rev (≈4.33 in³/rev).

• Pressure Rating: Maximum operating pressure up to 350 bar (≈5,075 psi) in certain configurations, with a standard continuous operating pressure typically around 280 bar.

• Speed Range: Engineered for a broad operational envelope, with maximum speeds often reaching 2400 rpm or higher, dependent on control type and porting.

• Defining Feature: Its extensive suite of integrated control options, which transform the basic pump into an intelligent, system-optimizing component.

Control Variants: The Intelligence Behind the Power

Selecting the correct control variant is the single most critical application decision for the A10VO71. This choice determines the pump's behavior and, by extension, the system's efficiency and functionality.

Pressure Control (LR, LU, LRC)

• Function: Acts as a self-regulating, high-efficiency pressure source. It automatically reduces displacement ("de-strokes") to maintain a pre-set system pressure, delivering only the minimal flow necessary to compensate for leaks or system changes.

• Expert Application: In a plastic injection molding machine, an LRC-controlled A10VO71 provides the intense holding pressure during the curing phase without cycling a pressure relief valve. The pump simply maintains pressure at the setpoint with minimal flow, slashing energy consumption and heat generation compared to a fixed pump system.

Pressure/Flow Compensator (LRDS, LRDF)

• Function: Delivers a constant, pre-set flow rate to a function regardless of load-induced pressure fluctuations (within driver power limits). It combines priority flow control with pressure-limiting functionality.

• Expert Application: The feed circuit of an industrial planer or grinder requires a constant table speed for a uniform surface finish. An LRDF-controlled A10VO71 ensures this constant speed is maintained as the tool engages the workpiece, regardless of cutting resistance.

Load-Sensing Control (LRDS with LS port)

• Function: The pinnacle of hydraulic efficiency for multi-function systems. The pump constantly monitors the highest pressure demand from all active functions via a dedicated LS (Load Sense) line. It then delivers only the required flow at a pressure marginally higher (the "Δp" or delta-P) than that demand.

• Expert Application: In a mobile crane performing simultaneous boom hoist, telescope, and swing functions, a load-sensing A10VO71 automatically provides the exact pressure needed for the most demanding task and allocates available flow as directed by the operator's valve inputs. This eliminates wasteful pressure drops across throttling valves, saving substantial energy and reducing cooling requirements.

Performance Characteristics & Design Advantages

The widespread preference for the A10VO71 among OEMs and rebuilders is rooted in a suite of proven performance characteristics:

• High Power Density: Its compact, robust design delivers exceptional power output relative to its size and weight, a non-negotiable advantage in space-constrained mobile equipment.

• Superior Overall Efficiency: Precision manufacturing minimizes internal leakage (high volumetric efficiency), while optimized kinematics reduce friction (high hydromechanical efficiency). This translates directly to lower operating costs via reduced fuel or electrical consumption and less waste heat.

• Responsive and Stable Control Dynamics: The integrated control mechanisms are renowned for their precise, stable, and fast response, enabling smooth and accurate machine control essential for both productivity and safety.

• Engineered for Serviceability: Designed with maintenance in mind. Key sub-assemblies—the rotating group, housing, and control cover—are logically separable, facilitating inspection, seal replacement, or overhaul with proper tooling and expertise.

Common Industrial & Mobile Applications

The A10VO71's blend of robustness, efficiency, and controllability makes it a versatile solution across sectors:

• Mobile Machinery: The workhorse of hydraulic systems in excavators, wheel loaders, telehandlers, and cranes, powering work functions, travel drives, and steering.

• Industrial Production: Critical for plastic injection molding machines, hydraulic presses, and machine tool auxiliaries (e.g., clamping, tool changers), where precise, repeatable force is paramount.

• Material Processing: Provides reliable power for wood chippers, compactors, and balers, where equipment faces pulsating loads and demanding duty cycles.

For more information on the A10VO71 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1:What is the most common failure mode for an A10VO71, and how can it be prevented?

A1:Contamination is the leading cause of failure. Wear in the rotational group (piston/bore, slipper/swashplate) often stems from poor fluid cleanliness. Adherence to a strict ISO 4406 cleanliness code​ (typically 18/16/13 or better, as per Rexroth recommendations) is paramount. Preventive maintenance with regular filter changes and oil checks is the most cost-effective strategy.

Q2:My pump is noisy. What could be the issue?

A2:Cavitation (a sucking noise, often at the inlet) is a common cause. Check the inlet conditions: ensure the suction line is unrestricted, the reservoir breather is clear, the fluid viscosity is correct for the temperature, and the pump is not mounted too high above the fluid level. Whining or grinding noises may indicate internal wear or bearing failure.

Q3:How to purchase an A10VO71 hydraulic pump?

A3:You can click on the right sidebar or the contact information in the top bar to contact us to purchase. You can do so via email, form, WeChat, WhatsApp, or other methods.

Q4:What is the price and delivery time of the A10VO71 hydraulic pump?

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