Bosch Rexroth A10VNO Axial Piston Variable Pump

The A10VNO is a swashplate design axial piston pump configured for open-circuit operation . The "N" in its nomenclature typically denotes specific seal and bearing configurations optimized for lower system pressures, distinguishing it from the standard A10VO series.

Unlike fixed displacement pumps, this variable pump adjusts its output to match system demand. This capability reduces energy waste and heat generation, a critical advantage in continuous-operation machinery.

A10VNO vs. A10VO: Understanding the Distinction

While they share a common family resemblance, the distinction is crucial for system design:

A10VO (Medium Pressure): Generally rated for nominal pressures up to 280 bar (maximum 350 bar). Suitable for main implement lifts and steering systems .

A10VNO (Low Pressure): Optimized for nominal pressures up to 240 bar (maximum 280 bar) or lower. It is designed for high-speed applications where pressure is secondary to flow and thermal efficiency .

Example: A modern combine harvester uses an A10VO for its header lift (requiring high force) but uses an A10VNO for the radiator cooling fan (requiring high speed and variable flow). Using a high-pressure pump for a fan drive would increase costs and parasitic energy loss.

Key Technical Specifications

The A10VNO series, particularly Series 52 and 53, is engineered for longevity in dusty, mobile environments. Common sizes include displacements ranging from 28 cc/rev up to 85 cc/rev .

Performance Highlights:

High Speed Approval: Specifically approved for high rotational speeds, making them ideal for direct engine-mounted fan drives where overspeeding is a risk .

Through-Drive Capability: Most models support a through-drive, allowing you to mount a second pump (gear or piston) directly to the rear of the unit without a separate adapter .

Low Noise Signature: The swashplate technology significantly reduces fluid pulsation, resulting in operating noise up to 70% lower than comparable gear pumps in fan applications.

Control Options for the A10VNO

Rexroth offers several hydraulic controllers to tailor the pump to the machine's logic. The model number (e.g., DRS, DRF) defines the control type.

1.DRS (Pressure and Flow Control)

The most common variant for the A10VNO. It combines pressure cut-off with load-sensing (flow) control.

Application: Fan drives and auxiliary circuits where flow must vary with engine speed.

2.DRG (Remote Pressure Control)

Allows for remote adjustment of the pressure compensator setting via an external hydraulic signal.

Application: Systems requiring selectable pressure limits for different tools.

3.DRF (Flow Control)

Maintains a constant flow regardless of pump input speed (within limits).

Application: Steering circuits or constant speed drives .

Applications (Examples)

The "economic viability" of the A10VNO makes it a preferred alternative to fixed pumps . Here is where you will find it:

Tractor Fan Drives: Modern Tier 4/Stage V engines require variable, on-demand cooling. The A10VNO varies the fan speed precisely, saving fuel and reducing decibel levels for operator comfort.

Agricultural Sprayers: Used for agitation and transfer pumps where pressure is low but volume is high.

Industrial Sweepers: Powers the main blower fan requiring constant high speed but variable torque.

Harvesters: Specifically for straw chopper drives and grain augers .

Maintenance and Troubleshooting

As a component, the A10VNO requires no user adjustments during general operation, provided it remains within specified parameters . However, when issues arise, a methodical approach is required.

Common Issue: Pump fails to stroke (no flow).

Troubleshooting Step: Before blaming the pump, inspect the pilot pressure and control valve. As the manual notes, perform troubleshooting with reduced operating data first and look for recent changes to the system .

Critical Care Tips:

No High-Pressure Washers: Do not direct a pressure washer at the shaft seal or electrical components (sensors/solenoids). Water ingress here leads to premature failure and voided warranties .

Fluid Cleanliness: Like all axial piston units, the A10VNO requires a high level of fluid cleanliness (typically ISO 18/13/16 or better). Starved suction is a primary cause of failure.

For more information on the A10VNO hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What is the "52" or "53" in the model number?

A1: This refers to the Series index (Series 52 or Series 53). These indices denote specific bearing updates, seal materials, and shaft options. Always match the series when replacing a unit .

Q2:Why is my A10VNO running hot?

A2:Check the control settings. If the pump is at full stroke while the system is in "neutral" (e.g., a fan drive that is always on high), the excess flow is going over the relief valve, generating heat. Ensure the pressure compensator is set correctly.

Q3:How to purchase an A10VNO 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 A10VNO hydraulic pump?

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