Rexroth A11VO40 axial piston variable hydraulic pump

The A11VO40 is a variable-displacement axial piston pump with a swashplate design, manufactured by Bosch Rexroth, primarily used in closed hydraulic circuits. The "40" in the model name refers to its geometric displacement, approximately 40 cubic centimeters per revolution.

How the A11VO40 Works

The Swash Plate Principle

At the heart of the A11VO40 is a cylinder barrel containing a set of pistons arranged parallel to the drive shaft — the defining trait of an axial piston pump. As the shaft rotates, the pistons ride against an angled swash plate. That angle forces each piston to slide in and out of its bore as the barrel turns, drawing in fluid on one stroke and expelling it under pressure on the next.

Here's the part that makes it "variable displacement": the swash plate angle isn't fixed. A control mechanism tilts the plate to increase or decrease piston stroke length in real time. Tilt the plate further, and each piston moves more fluid per revolution — more flow. Bring the plate toward zero angle, and displacement drops toward zero, even while the shaft keeps spinning at full speed.

This is fundamentally different from a fixed-displacement gear or vane pump, where the only way to change output flow is to change shaft speed. The A11VO40 decouples flow control from prime-mover speed — which is exactly why it's so popular in applications where the diesel engine or electric motor needs to run at a constant, efficient RPM while hydraulic output still needs to vary.

Control Options

Rexroth offers the A11VO40 with several control variants, and picking the right one matters as much as picking the right pump:

DR (pressure control) – limits maximum system pressure by de-stroking the pump automatically

EP (electro-proportional control) – lets a PLC or controller command displacement electronically, ideal for automated systems

HD (hydraulic control) – displacement responds to an external pilot pressure signal

LR (load-sensing control) – matches pump output to actual downstream demand, improving efficiency

Typical Applications

The A11VO40 tends to show up in mid-sized closed-circuit and industrial hydraulic systems rather than in giant excavators (that's more A11VG territory) or tiny hand tools. Common use cases include:

Mobile Equipment

Compact wheel loaders and skid steers

Agricultural implements (balers, forage harvesters)

Concrete mixer trucks (drum drive circuits)

Winches and material handling equipment

Industrial Machinery

Plastic injection molding machines

Test rigs and hydraulic power units (HPUs)

Rotary drilling equipment

Marine deck machinery and steering systems

Common Problems and Troubleshooting

For more information on the A11VO40 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: What does "A11VO40" actually mean in Rexroth's naming code?

A1: "A11V" identifies the pump family (axial piston, variable, series 11), "O" indicates the open-circuit variant, and "40" denotes the geometric displacement in cm³ per revolution. The full Rexroth ordering code adds further letters and numbers for control type, shaft, mounting flange, and port configuration.

Q2: How long does an A11VO40 typically last?

A2: With clean fluid, correct alignment, and normal duty cycles, service life in the 10,000–20,000 operating hour range is common before major overhaul is needed. Contamination and cavitation are the two biggest life-shorteners.

Q3: How to purchase an A11VO40 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 A11VO40 hydraulic pump?

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