Rexroth A11VLO190 Open Circuit Axial Piston Hydraulic Pump

At its core, the A11VLO series is built for the most demanding open-loop circuits. Unlike closed-loop pumps (used for hydrostatic drives), this unit draws fluid from a reservoir and delivers it to actuators like cylinders and motors, with the return oil flowing back to the tank.

The Swashplate Principle

The pump uses a rotating barrel with nine pistons. The swashplate angle determines the piston stroke—steeper angle, higher flow. The A11VLO190 features a rotary swashplate design, which offers faster control response and higher pressure ratings than traditional pivoting swashplate designs.

Key Technical Specifications

Nominal displacement: 190 cm³/rev

Maximum speed: 2500 rpm (with reduced inlet pressure requirements)

Maximum pressure: 350 bar continuous / 400 bar peak (nominal)

Shafts: Tapered or cylindrical, compatible with SAE J744 standards

Porting: SAE flange connections for high-pressure integrity

Real-World Applications: Where You Will Find the A11VLO190

This pump is not for a lawn mower. It is engineered for the industrial and mobile heavyweights.

Example 1: Large Hydraulic Presses (Metal Forming)

A 500-ton stamping press requires high flow at low pressure for rapid approach, then instant high pressure (320+ bar) for forming. The A11VLO190’s low noise level and high suction capability ensure consistent forming cycles without cavitation.

Example 2: Crawler Excavators & Material Handlers

In a 50-ton excavator, the pump powers the swing circuit, boom, arm, and bucket. Using a load-sensing (LRDS) control variant, the pump precisely matches flow and pressure to the joystick demand—reducing fuel consumption by up to 15% compared to fixed-displacement systems.

Example 3: Offshore Winches

Corrosion-resistant options (using zinc-nickel coating, per ISO 12944 C5-M) make the A11VLO190 suitable for winch drives that must hold heavy loads for extended periods. The tapered piston rings maintain volumetric efficiency even after 10,000+ hours.

Control Systems You Can Configure

Open circuit pumps are defined by their regulators. The A11VLO190 offers several, but three dominate:

DR – Pressure Control (Constant Pressure)

The simplest form. The pump destrokes fully once the set pressure (e.g., 300 bar) is reached, only delivering flow to maintain that pressure. Ideal for accumulator charging or clamping circuits.

LRDS – Load Sensing with Pressure Cut-off (The Industry Gold Standard)

This combines:

Load sensing (LS): Adjusts flow to match the load’s required speed (Δp ~20-25 bar).

Pressure cut-off: Limits maximum system pressure to protect components.

Result: Minimal energy waste. Example: If a cylinder needs 80 L/min at 200 bar, the pump only produces exactly that.

DFE – Electronic Proportional Control

Uses a proportional solenoid to set the swashplate angle. Allows integration with PLC or CAN bus (SAE J1939). Excellent for variable-speed electric drives.

Installation & Maintenance

The A11VLO190 is robust, but it has non-negotiable needs.

Suction Conditions Are Critical

Because it is open circuit, the pump relies on a positive inlet pressure from the reservoir. Never starve this pump. Minimum recommended inlet pressure at maximum speed: 0.8 bar absolute (hot oil). Use a reservoir breather, a suction strainer (150 μm absolute), and a boost pump if the tank is remote.

Mounting and Alignment

The pump housing is not designed to absorb belt loads. Always use a flexible shaft coupling (e.g., KTR-SI or RINGFEDER). Misalignment above 0.3 mm radial will reduce bearing life by 50%.

Fluid Recommendations

Mineral oil: ISO VG 46 (typical) – Viscosity range: 10 to 600 mm²/s (optimum: 25-36 mm²/s)

Biodegradable oils: HEPR or HETG (with derating for viscosity)

Cleanliness: ISO 4406 code 18/15/12 (or cleaner). Use a return filter with β10 ≥ 75.

For more information on the A11VLO190 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What does the "LO" in A11VLO specifically stand for?

A1:"LO" is a Bosch Rexroth designation for the control type. In this context, it generally signifies a pump configured for "Load Sensing" (L)​ with a "Pressure Limiter" (D, for Druckbegrenzung). The exact control behavior is defined by the specific control code (e.g., LRDS) attached to the pump.

Q2:Can I repair an A11VLO130 myself in our workshop?

A2:While basic seal kits and control valve overhauls are within the scope of a well-equipped hydraulic shop, a major overhaul of the rotating group (cylinder block, pistons, swashplate) requires specialized tooling, a cleanroom environment, and expert knowledge. For critical applications, a factory-remanufactured exchange unit is often the most reliable and economical choice.

Q3:How to purchase an A11VLO190 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 A11VLO190 hydraulic pump?

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