Rexroth A11VLO130 Axial piston variable hydraulic pump

The A11VLO130 is a axial piston variable hydraulic pump. Its operation is elegant in concept yet robust in execution.

The Swashplate Mechanism

The pump's cylinder block, containing several pistons arranged in a circular pattern, rotates with the drive shaft. Each piston bears against a tilted plate—the swashplate. As the block rotates, the angle of the swashplate causes the pistons to reciprocate within their bores. This sinusoidal motion draws fluid in during the piston's withdrawal stroke and pressurizes it during the forward stroke. The key variable is the swashplate angle: a greater angle produces a longer piston stroke and higher displacement per revolution.

Variable Displacement for Efficiency

Unlike a fixed pump that delivers a constant flow, the A11VLO130's swashplate angle (and thus its displacement) is controlled hydraulically. A dedicated control piston, managed by an integrated control valve, adjusts the angle in response to system pressure or an external signal. This allows the pump to deliver exactly the flow demanded by the system, minimizing energy loss, heat generation, and fuel consumption—a critical advantage in today's efficiency-focused landscape.

Key Features & Technical Specifications

The A11VLO130's design incorporates several features that contribute to its longevity and performance.

• Model Breakdown: "A11VLO" identifies the series and control type (LO typically refers to a pressure-limiting, load-sensing, or power control option). "130" denotes a nominal displacement of 130 cm³/rev (approximately 7.93 cubic inches per revolution).

• Pressure Capability: This pump is built for continuous operation at high pressures, typically up to 350 bar (≈ 5,075 psi) in standard versions, with peak pressures even higher.

• Robust Construction: Featuring a heavy-duty housing, hardened rotating group components, and high-capacity bearings, it is designed to withstand the shock loads and contamination often present in harsh environments.

• Integrated Controls: The pump is most commonly paired with the LRDS or LRD control.

◦ LRDS Control: A load-sensing (LS) control with pressure limiter (DR) and torque limiter. It automatically adjusts flow to maintain a constant pressure differential across the most demanding actuator, optimizing performance and efficiency in systems with multiple functions.

◦ LRD Control: A pressure-limiting (DR) control with torque limiter, which reduces displacement as system pressure approaches a set maximum, effectively providing constant horsepower output.

Primary Applications & Use Cases

The A11VLO130 finds its home in machinery where its power density and variable flow capability are essential.

• Mobile Equipment: A mainstay in excavators, wheel loaders, cranes, and forest harvesters, where it provides the hydraulic power for digging, lifting, and maneuvering.

• Industrial Machinery: Used in plastic injection molding machines, presses, and test benches where precise, controllable power is required.

• Example in Action: In a 20-ton hydraulic excavator, an A11VLO130 pump might be the primary implement pump. During delicate grading work, the load-sensing control provides fine, metered flow to the boom and bucket cylinders. When the operator needs maximum force for breaking ground, the pump maintains high pressure while the torque limiter protects the diesel engine from stalling, seamlessly matching power delivery to the task.

Best Practices for Operation & Maintenance

Maximizing the service life of an A11VLO130 hinges on proper system design and disciplined maintenance.

Fluid & Filtration Requirements

The single most critical factor for piston pump longevity is fluid cleanliness. A minimum cleanliness level of ISO 4406 18/16/13 is strongly recommended. This necessitates the use of high-efficiency beta-rated filters (β10 ≥ 200) on the pump's inlet (if needed) and pressure lines. Using the correct viscosity oil, as specified by Rexroth for the operating temperature range, is equally vital.

Commissioning & Troubleshooting

Proper commissioning involves bleeding air from the pump casing, setting control pressures (e.g., the DR pressure limiter) to the machine manufacturer's specifications, and verifying smooth operation across the entire displacement range. Common failure modes like excessive noise, loss of pressure, or slow response are often traceable to:
1. Aerated or contaminated fluid.
2. Worn or stuck control pistons/valves.
3. Internal leakage past the rotating group due to wear.

For more information on the A11VLO130 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

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 A11VLO130 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 A11VLO130 hydraulic pump?

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