Rexroth A11VO axial piston variable pump for the Mecalac Walking machinery 5350072 5350145 5350149 5350165 5350182 5350206

The A11VO is a swashplate-design axial piston pump built for open-circuit hydraulic systems. It belongs to Bosch Rexroth's broader A1-series pump family, which is widely used across various mobile equipment, including excavators, cranes, forestry machines, and specialty platforms such as Mecalac's walking excavators.

Unlike fixed-displacement gear or vane pumps, the A11VO is a variable-displacement pump. It can adjust the amount of oil delivered per revolution without altering engine speed, which is crucial for matching hydraulic output to the specific task at hand, rather than operating at a fixed, wasteful output.

Why Mecalac Walking Machinery Relies on the A11VO

Mecalac's walking excavators (and related walking/legged working machines) are purpose-built for terrain that wheels and tracks can't handle well — steep embankments, wetlands, riverbeds, and unstable slopes. That job description places unusual demands on the hydraulic system.

The Hydraulic Demands of Walking Machines

A walking machine typically needs to run several functions simultaneously and independently:

1. Leg/limb actuation — extending, planting, and repositioning the machine's legs for stability and forward movement.

2. Body leveling — keeping the chassis level as the ground underneath shifts.

3. Working attachment control — operating the boom, arm, and bucket (or other tooling) while the base is moving.

Each of these functions has a different flow and pressure signature. Leg placement might need a quick burst of high flow at moderate pressure; fine leveling might need very low flow at high pressure; the working arm might need both, depending on the task. A fixed-displacement pump would force compromises across all three. A variable pump doesn't.

How the A11VO Fits Into the Drive System

In a typical Mecalac walking machine, the A11VO (often paired with a second pump section or a tandem A11VO/A4VG-style arrangement) draws from the engine's power take-off and feeds a network of directional control valves serving the leg cylinders, leveling system, and upper works. Because displacement adjusts on the fly:

The engine can run at a more efficient, steady speed while hydraulic output flexes to match demand.

Multiple functions can be run together (multi-function capability) without one starving another of flow.

Idle or low-demand periods — such as when the machine is stationary and only fine leveling is active — draw far less power than a fixed pump would.

Performance Benefits in the Field

Energy Efficiency

Because displacement — not engine speed — tracks demand, the machine only generates the hydraulic power it actually needs at any given moment. Over a full shift of repeated leg movements and attachment work, this translates into measurably lower fuel consumption compared with fixed-displacement systems doing equivalent work.

Load-Sensing Control

Many A11VO installations use a load-sensing (LS) control, where the pump continuously reads pressure feedback from the working valves and adjusts its own output to match — no more, no less. This keeps the system pressure just above what's needed to do the work, cutting throttling losses and heat generation, both of which matter on a machine that's frequently working at awkward angles for extended periods.

Reduced Heat and Component Wear

Lower unnecessary flow and pressure translate directly into lower system heat. On a walking machine, where hydraulic lines and cylinders are already working through complex, high-articulation movements, keeping oil temperatures down extends seal and hose life and reduces the frequency of cooling-system strain.

Smooth, Proportional Control

Electronic proportional (EP) variants of the A11VO allow finer, more predictable control response — useful for the delicate leveling and leg-placement movements walking machines rely on, where jerky hydraulic response could destabilize the machine.

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Q1: How do I know if my Mecalac's A11VO pump is failing?

A1: Common warning signs include reduced overall hydraulic power, sluggish or uneven leg/leveling response, rising oil temperature, unusual pump noise, and increased case drain flow. A hydraulic technician can confirm with pressure and flow testing against OEM specs.

Q2: Can an A11VO pump be used on machines other than Mecalac equipment?

A2: Yes. It's a general-purpose mobile hydraulics pump used across many OEMs' excavators, cranes, and specialty machines. Mecalac is one of several manufacturers that specify it for demanding multi-function applications.

Q3: What is the price and delivery time of the A11VO hydraulic pump for the Mecalac Walking machinery？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase an A11VO hydraulic pump for the Mecalac Walking machinery?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.