Bosch Rexroth A11VO A11VLO Swashplate hydraulic pump for Volvo excavator 14343513 14343136 11704016 14343518 14343530 14343533 15119542

The A11VO and A11VLO are variable displacement axial piston pumps built on a swashplate design, manufactured by Bosch Rexroth — one of the most established names in industrial and mobile hydraulics. They're used across construction, forestry, and material-handling equipment, and Volvo Construction Equipment has specified them for years across several excavator platforms as the main hydraulic pump driving the machine's implement and travel circuits.

Why Volvo Excavators Use This Specific Pump Design

Volvo's excavator hydraulic systems are built around load-sensing, and load-sensing systems need a pump that responds to pressure demand, not just engine RPM. A few reasons this pump family fits that role well:

Efficiency under partial load. Digging, swinging, and traveling rarely demand full flow simultaneously. A variable pump only produces what the circuit needs, cutting fuel consumption compared to a fixed-displacement setup that would otherwise dump excess flow over a relief valve.

Smooth multi-function control. Operators regularly combine boom, arm, and swing movements at once. The pump's fast response to the swashplate control keeps those combined movements smooth instead of jerky.

Durability under duty cycles. Excavators run for thousands of hours in dirty, high-vibration environments. The axial piston design tolerates that abuse better than many gear or vane pump alternatives, provided fluid cleanliness is maintained.

Compact power density. For the size and weight it occupies on the engine bulkhead, the pump delivers a high flow-to-size ratio, which matters on tightly packaged mid-size and large excavators.

Common Volvo Excavator Models Using A11VO/A11VLO Pumps

Volvo has fitted variants of this Rexroth pump family across several excavator classes, most commonly in the mid-to-large range — machines like the EC210, EC240, EC290, EC340, and EC380 series, among others. Exact pump displacement, port configuration, and control type vary by model year and machine size, so matching the correct part number to your specific excavator serial number is essential before ordering a replacement or rebuild kit.

Recognizing a Failing A11VO/A11VLO Pump

An excavator pump rarely fails without warning. It tends to tell you first, through symptoms that are easy to dismiss as "normal wear" until they aren't.

Loss of Power or Slow Cylinder Speed

If the boom or arm feels sluggish, especially under load, and the engine sounds like it's working harder than it should, internal wear inside the pump — worn pistons, scored cylinder bores, or a degraded swashplate bearing — is a common cause. Internal leakage lets pressurized fluid bleed back to the low-pressure side instead of doing useful work.

Unusual Noise: Whining, Cavitation, or Knocking

A high-pitched whine often points to cavitation, usually from a restricted suction line, a clogged filter, or air entering the intake side. A knocking or rattling noise under load can indicate worn piston shoes or a damaged swashplate surface.

Overheating Hydraulic Fluid

When a pump loses efficiency, more of the energy going into it converts to heat instead of useful flow and pressure. If your excavator's hydraulic temperature gauge runs hotter than it used to under the same working conditions, a worn pump is a strong suspect — worth checking alongside the cooler and fluid condition before assuming the worst.

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Q1: How long does an A11VO/A11VLO pump typically last on a Volvo excavator?

A1: Service life varies widely based on duty cycle, fluid cleanliness, and maintenance discipline, but well-maintained pumps in normal commercial use commonly run several thousand hours before needing rebuild work. Harsh environments or neglected fluid maintenance can cut that significantly.

Q2: Is it normal for the pump to make some noise?

A2: A quiet, steady hum under load is normal. Whining, knocking, or noise that changes noticeably with function combinations is not, and should prompt an inspection before it becomes a bigger repair.

Q3: What is the price and delivery time of the A11VO/A11VLO hydraulic pump for the Volvo excavator？

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/A11VLO hydraulic pump for the Volvo excavator?

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