Bosch Rexroth 31 series A10VO100 variable displacement hydraulic pump

The A10VO100 is a variable-displacement axial piston pump built by Bosch Rexroth for open-circuit hydrostatic drive systems. "A10VO" identifies the product line — an open-circuit variable pump with a swashplate rotary group — while "100" refers to the displacement size (100 cm³ per revolution), and "Series 31" is the current design generation covering sizes NG18 through NG140.

How the A10VO100 Works

Swashplate Design and Variable Displacement

Inside the pump, a rotating cylinder barrel houses a set of pistons arranged around a central shaft. Each piston rides against a swashplate set at an angle. As the shaft turns, the pistons are forced in and out of their bores, drawing in and expelling hydraulic fluid. The key detail: the swashplate's angle determines piston stroke length, and stroke length determines displacement per revolution.

By adjusting that angle steplessly — from zero displacement up to maximum — the pump output flow can be varied continuously while the drive speed stays constant. This is what separates the A10VO100 from a fixed-displacement pump: the operator or control system gets exactly the flow needed for the task, not a fixed amount that has to be throttled or bled off downstream.

Key Technical Specifications

For the NG100 frame size in Series 31, the pump is generally built around these core figures:

Geometric displacement (Vg max): 100 cm³ per revolution

Nominal operating pressure: 280 bar

Peak/maximum pressure: 350 bar

Maximum rotational speed at Vg max (nnom): around 2,000 rpm

Maximum flow at nnom and full displacement: roughly 200 l/min

Circuit type: open circuit, single or tandem/multi-pump configurations

Through-drive: rated for 100% through-drive, allowing a second pump of equal size to be flange-mounted behind it

Exact values vary by control type, shaft configuration, and whether you order a standard or high-speed version —always confirm against the current Rexroth data sheet (RE 92701) and the pump's nameplate before specifying replacement parts.

Control Options

One reason the A10VO100 shows up across so many machine platforms is the breadth of control variants Rexroth offers on the same base pump. Common control types include:

DR – Pressure control: limits maximum system pressure, reducing displacement automatically as pressure rises

DFR – Pressure and flow control: combines pressure limiting with load-sensing-style flow adjustment

LR3 – Load-sensing control: matches pump flow to the actual demand of the connected valve/actuator, minimizing energy loss

EO/ER – Electric proportional control: allows the machine's electronic controller to command displacement directly via a solenoid, useful in modern electrohydraulic systems

Installation and Maintenance Considerations

Mounting and Drive Speed

The A10VO100's maximum permissible speed drops as displacement decreases from full stroke, and a "high-speed version" is available for applications needing higher nnom limits. Running the pump continuously above its rated speed accelerates cavitation erosion and shortens service life — this is one of the most common causes of premature failure in the field.

Minimum Inlet (Suction) Pressure

Because axial piston pumps are sensitive to starvation at the suction port, Rexroth specifies a minimum inlet pressure that scales with both rotational speed and displacement ratio. Undersized suction lines, clogged strainers, or excessive suction lift are frequent real-world culprits behind cavitation damage on these pumps — always check suction-side plumbing before blaming the pump itself for noise or performance loss.

Fluid Cleanliness and Temperature

Like most precision axial piston units, the A10VO100 is unforgiving of contaminated oil. Maintaining proper filtration (typically ISO 4406 cleanliness targets specified by Rexroth) and keeping case drain temperature below the rated maximum (around 115°C) will do more for pump life than almost anything else in a maintenance plan.

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Specifications

Selection Table

Q1: What causes a whining or cavitation noise in these pumps?

A1: Most often it's suction starvation — a clogged suction strainer, undersized suction hose, air leak on the inlet side, or running the pump above its rated speed at high displacement. Aerated or overheated fluid can produce similar symptoms.

Q2: Where can I find the exact specs for my specific pump?

A2: Every A10VO100 has a nameplate with a full ordering code (e.g., A10VO100DR/31R-VSC62N00) that defines control type, shaft, ports, and seal material. Cross-reference that code against Rexroth's current data sheet (RE 92701) or contact an authorized Rexroth distributor for exact specifications.

Q3: How to purchase an A10VO100 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 A10VO100 hydraulic pump?

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