Bosch Rexroth A11VO75 open circuit axial piston hydraulic pump

The A11VO75 is a variable displacement axial piston pump built on a swashplate design, engineered specifically for open-circuit hydrostatic drive systems. The "75" in the model name refers to its geometric displacement — roughly 75 cc per revolution — placing it in the middle of the broader A11VO lineup, which spans sizes from 40 cc/rev up to 260 cc/rev.

Key Technical Specifications

Understanding the numbers matters as much as understanding the concept, especially when you're cross-referencing a replacement unit or sizing a system.

Displacement and Pressure Ratings

Displacement: approximately 75 cm³/rev

Nominal pressure: 350 bar (5,100 psi)

Peak pressure: 400 bar (5,800 psi)

Design type: Series 1 axial piston, swashplate, variable displacement

Flow Characteristics

Output flow on the A11VO75 is directly proportional to input drive speed and swashplate angle. Since the swashplate can be adjusted continuously between maximum displacement and zero, flow output is infinitely variable across that range — there's no step-change or fixed increments. This is what allows a hydrostatic drive built around this pump to modulate travel speed or actuator speed smoothly, rather than in jumps.

Priming and Charge Options

One detail that trips up a lot of first-time specifiers: the A11VO75 doesn't strictly require an external charge pump. It can operate under self-priming conditions, with a pressurized tank, or with an optional integrated charge pump (impeller) for applications where inlet conditions are marginal. That flexibility is a big part of why this pump gets specced into such a wide range of machine platforms.

Control Options: Matching the Pump to the Application

This is where the A11VO75 really earns its reputation as a "system component" rather than a plug-and-play part. Bosch Rexroth offers several control variants, and choosing the right one has a direct impact on machine behavior, fuel efficiency, and operator feel.

LR — Power (Load-Sensing) Control

The LR control regulates displacement based on operating pressure, keeping drive power roughly constant at a given input speed. As pressure rises, displacement is automatically trimmed back so the prime mover isn't overloaded. This is a common choice on machines where engine power needs to be protected across a wide range of working pressures — think excavators digging in variable soil conditions.

DR — Pressure Control

DR control limits maximum system pressure by reducing pump displacement as the set pressure is approached. It's a more direct pressure-limiting strategy than LR, and it's often used where a hard pressure ceiling matters more than power optimization.

HD — Hydraulic (Pilot-Pressure) Control

HD control lets displacement be adjusted remotely using a pilot pressure signal, which is useful in systems where the operator (or another control loop) needs to command flow output without a direct mechanical linkage to the pump itself.

EP — Electric Proportional Control

EP control uses a proportional solenoid to set displacement electronically. This is the natural fit for machines with electrohydraulic control architectures, where flow commands come from a controller rather than a hydraulic pilot signal — increasingly common as mobile equipment moves toward more electronic control.

Where the A11VO75 Is Typically Used

Because it's a mid-displacement, medium-pressure-capable pump, the A11VO75 tends to show up in applications that need meaningful flow without moving into the largest, heaviest pump frames.

Typical use cases include:

Hydrostatic travel drives on wheel loaders, compact track loaders, and similar mobile equipment

Fan drive circuits on machines requiring variable cooling airflow tied to hydraulic demand

Winch and auxiliary drive systems on cranes and specialty vehicles

Industrial mobile platforms where a compact, high-pressure-capable open circuit pump is needed but a full-size unit would be overkill

For more information on the A11VO75 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: What control options are available for the A11VO75?

A1: The main variants are LR (power control), DR (pressure control), HD (hydraulic pilot-pressure control), and EP (electric proportional control), each suited to different system architectures.

Q2: What industries or machines commonly use the A11VO75?

A2: It's most often found in mobile equipment — wheel loaders, compact loaders, cranes, and specialty vehicles — typically in hydrostatic travel drives, fan drives, or auxiliary hydraulic circuits.

Q3: How to purchase an A11VO75 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 A11VO75 hydraulic pump?

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