Rexroth A11VO A11VLO series 40 open-circuit hydraulic pump

The A11VO is a variable-displacement axial piston pump in swashplate design, built for open-circuit hydraulic systems. In an open circuit, the pump draws oil from a reservoir (tank) at atmospheric or slightly above-atmospheric pressure, delivers it to the consumers, and the oil returns to the tank afterward.

Series 40 is the generation that Bosch Rexroth (part of the Bosch Group) positioned for medium- to high-pressure work, with a nominal pressure typically quoted at 350 bar and a peak pressure around 400 bar. It is designed for both mobile and stationary machinery.

Key characteristics at a glance

• Pump type: swashplate axial piston, variable displacement
• Circuit: open circuit only (not for closed-loop hydrostatic transmissions)
• Pressure range: nominal ~350 bar, peak ~400 bar
• Size range: roughly 40 to 260 cm³/rev across the family (check the data sheet for exact frame sizes)
• Rotation: clockwise or counter-clockwise, selected at ordering
• Through-drive: available for mounting additional pumps in tandem
• Mounting: SAE-style flange and splined shaft options

Real-World Application Examples

Example 1: Crawler excavator main pump

A mid-size excavator often uses a tandem arrangement: two variable pumps driven off the same engine via a through-drive, feeding separate boom, arm and swing circuits. A load-sensing control with power limiting keeps the engine near its optimal speed while the operator works multiple functions at once.

Example 2: Hydraulic press power unit

In a stationary press, a pressure-controlled A11VO runs at set system pressure and destrokes to near-zero flow during the holding phase. The result is cooler oil, smaller coolers and lower electrical consumption compared with a fixed pump and relief valve setup.

Example 3: Truck-mounted crane

Here the pump is driven by a power take-off (PTO). A compact, high-speed-capable unit with load sensing gives smooth, proportional crane movement without wasting engine power while the crane idles between lifts.

Installation Best Practices

• Fill the housing with clean oil before start-up. Dry running even for a few seconds can damage bearings and sliding surfaces.
• Route the case drain to the tank above the oil level in the correct port. Use the highest available drain port for air venting, and keep the line short and unrestricted.
• Keep the suction line large, short, and airtight. Avoid sharp bends and any pressure drop that would starve the pump.
• Align the shaft carefully. Use a flexible coupling and respect radial and axial load limits.
• Bleed the system. Air in the circuit causes noise, erratic control, and accelerated wear.
• Respect the mounting orientation allowed in the data sheet.

For more information on the A11VO/A11VLO hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: Is the A11VLO interchangeable with the A11VO?

A1: Not automatically. Flange, shaft, port layout and speed ratings can differ. Compare the complete type codes and mounting dimensions before swapping.

Q2: What causes premature failure?

A2: Contamination, cavitation from poor suction, running dry on start-up, and operating outside viscosity or temperature limits account for the majority of early failures.

Q3: How to purchase an A11VO/A11VLO hydraulic pump?

A3: 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 A11VO/A11VLO hydraulic pump?

A4: We will provide the price and delivery time based on the specific model you provide.