Bosch Rexroth A11VLO145 swashplate axial piston hydraulic pump

The A11VLO145 is a variable-displacement, swashplate-type axial piston pump from Bosch Rexroth's A11V(L)O series. It belongs to an open-circuit hydrostatic pump family built primarily for mobile equipment — think excavators, cranes, drilling rigs, and other machines that need a lot of flow and precise, load-responsive control.

How the Swashplate Design Works

Unlike a bent-axis pump (Rexroth's A2FO/A4VG families being common examples), the A11VLO145 uses an inline swashplate design. The cylinder block and pistons rotate on a fixed axis, and displacement is varied by tilting a swashplate rather than tilting the entire rotating group.

That design choice has a few practical consequences:

Compact envelope. Because the shaft stays in a straight line, the pump fits into tighter engine compartments than a comparable bent-axis unit.

Lower rotating inertia. Only the swashplate angle changes during a displacement adjustment — the cylinder block itself doesn't have to swing — so the pump reacts quickly to control inputs.

Straightforward load-sensing integration. The servo piston that adjusts swashplate angle can respond to pressure signals in a fraction of a second, which matters a lot when an operator is feathering a joystick and expects the implement to respond immediately.

As the swashplate angle increases, piston stroke length increases, and so does the volume of fluid displaced per revolution. At zero degrees, the pump produces essentially no flow even while the shaft keeps turning — which is what lets these pumps sit "destroked" at idle without wasting horsepower.

The Integrated Charge Pump

The "L" in A11VLO refers to a small auxiliary gear or vane pump built onto the back of the main unit. Its jobs are to:

1. Pre-pressurize the pump's internal case and control circuit, preventing cavitation at the main pistons

2. Supply oil to the servo control system that positions the swashplate

3. Allow the pump to run at higher input speeds than a self-priming (non-charged) version could tolerate

This is why the A11VLO version is the preferred choice in applications with higher engine speeds or where an external boost pressure source isn't practical.

Control Options: Matching the Pump to the System

One of the reasons this pump shows up across so many machine platforms is the breadth of control heads Bosch Rexroth offers on the same base unit:

Power (Torque) Control

Limits the pump's displacement as a function of system pressure so the input horsepower demand never exceeds what the prime mover (diesel engine) can supply. This is the classic "constant horsepower" curve you'll see on a pump performance chart — as pressure rises, maximum allowable displacement falls off along a hyperbolic curve.

Pressure (Compensator) Control

Holds system pressure at a fixed setpoint by destroking the pump as soon as that pressure is reached, regardless of flow demand. Useful in applications where pressure — not flow — is the variable that needs tight control.

Load-Sensing / Pilot-Pressure Control

The pump continuously compares load-induced pressure downstream of a metering orifice to pump outlet pressure, adjusting displacement to maintain just enough margin pressure to move the load. This is the control strategy most commonly paired with excavator travel and boom circuits, since it lets the pump deliver exactly what the actuator needs and nothing more — improving fuel economy noticeably compared to a fixed-displacement, throttled system.

Electro-Proportional Control

A solenoid-driven control spool lets an electronic controller command swashplate angle directly, which is increasingly common as OEMs move toward electrohydraulic (rather than purely hydro-mechanical) machine control architectures.

Common Applications

The A11VLO145 shows up almost anywhere a machine needs strong, controllable flow in a compact package:

Excavators — often mounted in a tandem pair, one pump per track/circuit, using negative flow control (NFC) or positive flow control (PFC) logic tied to joystick pilot pressure

Cranes and drilling rigs — where load-sensing control lets multiple functions share pump flow smoothly

Concrete pumps and specialty mobile equipment — where high pressure and precise flow modulation are both required

Industrial applications with mobile-style duty cycles — presses, test rigs, and other systems that benefit from the pump's compact, high-power-density layout

For more information on the A11VLO145 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: How do I know if my A11VLO145 needs a rebuild versus a full replacement?

A1: Track case drain flow against the baseline for a new pump at the same pressure and speed. A significant, sustained increase points to internal wear in the rotating group. Combined with symptoms like sluggish response or falling output flow, that's usually the point where a rebuild (or replacement) makes more sense than continuing to run it.

Q2: What control types are available for the A11VLO145?

A2: Power (torque) control, pressure (compensator) control, hydraulic pilot-pressure control, load-sensing control, and electro-proportional control — the same base pump can be ordered with different control heads depending on the application.

Q3: How to purchase an A11VLO145 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 A11VLO145 hydraulic pump?

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