A11VO40 / A11VO60 / A11VO75 / A11VO95 / A11VO130 / A11VO145 / A11VO190 / A11VO260

The A11VO pump is available in a variety of models, each representing different displacement specifications within the A11VO series of swashplate-type axial piston variable pumps. The key differences among these models lie in their output capacity, mounting dimensions, and suitability for heavy-duty applications.

Specification and Performance Comparison

First, Differences

1. Small and Medium Sizes (A11VO40/A11VO60/A11VO75/A11VO95):

Applications: Primarily used in small excavators, cold milling machines, or auxiliary power systems with space-constrained requirements.

Features: High self-priming speed and responsive dynamic performance. Models 40 and 60 are often equipped with DRG (Remote Pressure Control) or LRDS control.

2. Medium-to-Large Sizes (A11VO130/A11VO145/A11VO190):

Applications: Mainstay models, widely used as main pumps in rotary drilling rigs, tunnel boring machines, and large construction machinery.

Features: L (centrifugal pump) variants are now available (e.g., A11VLO), which improve suction performance through an integrated booster pump. The 145 model represents a widely adopted sweet spot in the market.

3. Extra-Large Sizes (A11VO260):

Applications: Mining equipment, ultra-large hydraulic power units.

Features: Possesses extremely high torque capacity, typically serving as the core power source for hydraulic systems, supporting 100% torque through shaft-through drive to connect with other pump units in series.

4. Key Differences in Selection

Maximizing power utilization for pumps of the same displacement.

Consistency in control logic: Although displacements differ, they are all compatible with control valve blocks such as LRDS (power + pressure + load-sensing) and EP (electro-proportional), ensuring uniformity in system tuning.

Second, How to Select the Appropriate Variable Pump Model

1. Three-Step Core Selection Method

Determine rated parameters:

Flow Rate (Q): Calculated based on the maximum speed of the actuator (cylinder or motor). The rated flow rate should be 1.1 to 1.15 times the normal flow rate.

Pressure (P): The nominal pressure must cover the system’s maximum operating pressure. The A11VO series has a nominal pressure of 320–350 bar, which is sufficient for most heavy-duty mobile machinery.

2. Matching Control Logic:

Constant Power (LR): Suitable for applications where the power source (e.g., engine) has limited power, preventing stalling due to overload.

Load Sensing (S): Suitable for multi-way valve systems; it delivers only the flow required by the actuator, offering extreme energy savings.

Pressure Cut-off (D): Protects the system by reducing flow to zero when pressure reaches a set value, thereby reducing heat generation.

3. Verify Physical Environment:

Speed Limit: Confirm that the drive source speed does not exceed the pump’s self-priming limit. If the speed is too high, select a model with a centrifugal pump (e.g., A11VLO) to ensure forced oil replenishment.

Space and Through-Shaft: If a second pump is to be connected in series, verify the torque capacity of the through-shaft drive at the pump outlet.

Recommendations for Avoiding Selection Pitfalls

Do not focus solely on maximum displacement; examine the power curve instead. High-displacement pumps deliver high flow rates at low pressures but may cause the prime mover to stall at high pressures.

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