Rexroth A20VLO190 axial piston variable double pump

The A20VLO190 belongs to Bosch Rexroth's A20V family of axial piston pumps, built on the swashplate design principle. The "double pump" (sometimes labeled "LO" for the two-flange, back-to-back configuration) means two pumping units are mounted on a shared shaft and housing, each capable of independent variable displacement.

How the A20VLO190 Works

Swashplate and Variable Displacement Principle

At the core of the A20VLO190 is a rotating cylinder block containing several pistons arranged axially around a shaft. These pistons ride against a swashplate set at an adjustable angle. As the shaft turns, the pistons move in and out of their bores, drawing in fluid and pushing it out under pressure.

The angle of the swashplate determines piston stroke length — and therefore, flow output. Tilt the plate more, get more flow; bring it toward neutral, and flow drops toward zero, even while the shaft keeps spinning at a constant speed. This is what makes it a variable-displacement pump, as opposed to a fixed-displacement gear or vane pump that always outputs a set volume per revolution.

The "Double Pump" Configuration

In the A20VLO190, two independent piston-pump sections sit on a common drive shaft, each with its own swashplate, control mechanism, and outlet port. This allows:

Independent flow control for two separate hydraulic circuits (e.g., boom function vs. travel function on an excavator)

Load sharing across a single prime mover (engine or electric motor)

Space and weight savings compared to two standalone pump units

Each pump section can be controlled by its own regulator — pressure compensator, load-sensing valve, power control, or electric proportional control — depending on how the unit is ordered.

Control Options

Rexroth typically offers several control variants for this pump family, including:

DR — Pressure control (constant pressure)

DFR — Pressure and flow control combined

LR — Load-sensing control

EP — Electric proportional control

HD/HM — Power control (horsepower limiting)

The right control type depends entirely on the application's duty cycle and how tightly you need to manage input power versus output flow.

Common Applications

Mobile Hydraulics

This is where the A20VLO190 spends most of its working life. Typical machines include:

Excavators — one pump section feeding the boom/arm/bucket circuit, the other feeding travel or swing

Wheel loaders — steering and lift circuits run independently but off one engine PTO

Cranes and material handlers — where simultaneous multi-function movement needs separate flow paths

Industrial and Stationary Equipment

Injection molding machines — clamping and injection circuits benefit from independent variable flow

Presses — fast-approach and high-pressure pressing phases often use split circuits

Test rigs and simulation benches — where two independent, precisely controllable flows are required from one drive

For more information on the A20VLO190 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What causes most premature failures in this pump family?

A1: Fluid contamination and inlet starvation (running the pump below its minimum required inlet pressure) account for the large majority of field failures, more so than simple wear-out from normal operating hours.

Q2: Can the two pump sections run at different pressures simultaneously?

A2: Yes. Since each section has its own independent control, one side can run at a different pressure and flow setting than the other, which is exactly the point of the double-pump design — it lets one shaft serve two circuits with different demand profiles.

Q3:How to purchase an A20VLO190 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 A20VLO190 hydraulic pump?

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