Bosch Rexroth A10VSO45 series 31 open circuit hydraulic pump

The A10VSO45 is a variable displacement axial piston pump built on a swashplate design, intended for open circuit hydraulic systems. "45" refers to its geometric displacement — roughly 45 cm³ per revolution — which places it in the small-to-mid range of the A10VSO family (sizes typically span from 18 up to 140). "Series 31" identifies the specific engineering generation of the design, covering everything from the housing geometry to the control valve options and mounting interfaces.

Key Design Characteristics

Swashplate axial piston architecture — displacement is varied by changing the angle of the swashplate, which alters the stroke length of the pistons.

Through-drive capability — additional pumps of equal or smaller size can be mounted directly onto the back of the unit, letting designers stack multiple circuits without adding a second driveshaft or motor.

Good suction characteristics — the pump is engineered to handle self-priming demands well, which matters at higher shaft speeds where cavitation risk increases.

Low operating noise — a frequent selling point in factory environments where multiple pumps run continuously near operators.

How the A10VSO45 Works

At the core of any axial piston pump is a cylinder block with pistons arranged parallel to the drive shaft. As the shaft rotates, the pistons ride against the swashplate. When the swashplate is tilted, the pistons are forced to stroke in and out as the block rotates — drawing fluid in on one half of the rotation and discharging it on the other.

What makes the A10VSO "variable" is that the swashplate angle isn't fixed. A control mechanism adjusts the angle in real time, which changes displacement (and therefore output flow) without changing shaft speed. This is the mechanism behind pressure and flow control.

Control Options

Series 31 pumps are available with several control types, and picking the right one is often the difference between a system that runs efficiently and one that fights itself:

DR (pressure control) — the pump automatically reduces displacement as system pressure approaches the set point, holding pressure constant while flow drops off. Common in clamping circuits or any application holding a load at pressure.

DFR (pressure and flow control) — combines pressure limiting with a flow control function, useful where a machine needs a steady flow rate at a given pressure ceiling, like in press feed circuits.

DRG / DRS and electronic variants — allow remote or proportional adjustment of pressure setpoints, useful in systems with PLC-based control where pressure needs to change with the process step.

Operating Parameters

Based on Bosch Rexroth's published data for the Series 31 line, the A10VSO45 typically runs at a nominal pressure of 280 bar, with a maximum pressure rating of 350 bar — figures that hold across most of the standard control variants in this series. Maximum shaft speed depends on the mounting orientation (above or below the reservoir) and inlet conditions, so it's always worth checking the specific datasheet for the exact control code and mounting position you're working with rather than assuming a blanket number.

Installation and Maintenance Notes

A few practical points that come up repeatedly in the field:

Mounting position matters. Above-reservoir and below-reservoir (submerged) installations have different minimum fluid level requirements, and pumps with electrical components generally shouldn't be submerged.

Don't touch the factory setting screws without authorization — adjusting them without proper procedure voids the warranty and can throw off the pressure or flow calibration.

Protect the ports. Shipping plugs on the A10VSO are not pressure-rated; unused ports need a proper threaded plug before commissioning.

Watch suction conditions. Even with good self-priming characteristics, an undersized suction line or a clogged strainer will starve the pump and accelerate wear — this is one of the most common causes of premature piston and cylinder block wear in the field.

Use genuine or Rexroth-approved seal kits and cartridge kits when rebuilding, since tolerances on the piston-to-bore fit are tight enough that off-spec parts noticeably shorten service life.

For more information on the A10VSO45 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: Can two A10VSO45 pumps be mounted in tandem?

A1: Yes, provided the size and control combination is within the through-drive torque rating of the lead pump. This is a common way to run two independent circuits — say, a main press circuit and a smaller ejector circuit — off one electric motor.

Q2: How long does an A10VSO45 typically last before rebuild?

A2: Service life depends heavily on fluid cleanliness, suction conditions, and duty cycle rather than a fixed number of hours. Well-maintained units in clean systems commonly run for years of continuous industrial service; the leading cause of early failure is contaminated hydraulic fluid or cavitation from poor suction plumbing, not the pump design itself.

Q3: How to purchase an A10VSO45 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 A10VSO45 hydraulic pump?

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