Rexroth A10VO28 series 52 and 53 axial piston variable pump

The A10VO is an axial piston variable displacement pump built for open-circuit hydraulic systems. In plain terms, it's a swashplate-style pump where a set of pistons, arranged around a rotating cylinder block, draw fluid in and push it out. The volume of oil delivered per revolution is changed by tilting the swashplate, rather than by changing the pump's speed.

The "28" in A10VO28 refers to the geometric displacement, roughly 28 cm³ per revolution at maximum swashplate angle. It's the smallest common frame size in the standard A10VO lineup (which typically runs from 18 up through 140 cm³), making it a popular choice for compact machines and auxiliary circuits where a big pump would be overkill.

Series 52 and series 53 are Rexroth's internal engineering revisions of the same basic frame size. They share the same mounting footprint and displacement class but differ in internal detailing — control valve porting, shaft options, and some dimensional refinements.

The A10VO28's compact size and moderate flow output make it a natural fit for:

Compact construction equipment — mini excavators, compact wheel loaders, skid steers

Agricultural machinery — sprayers, smaller tractors, implement drive circuits

Material handling equipment — forklifts and narrow-aisle vehicles

Injection molding and plastics machinery auxiliary circuits

Industrial power units where a compact, quiet variable pump is preferred over a fixed gear pump

Example: Load-Sensing Circuit on a Compact Excavator

On a compact excavator, an A10VO28 with an LRG (load-sensing) control continuously adjusts displacement so the pump only produces the flow and pressure the boom, arm, and travel functions are actually demanding at any given moment. This cuts fuel burn during light digging cycles and reduces heat buildup in the hydraulic tank compared to a fixed-displacement setup that would otherwise dump excess flow across a relief valve.

Example: Pressure-Compensated Circuit on an Injection Molding Machine

A DR (pressure control) variant is often used to hold clamping pressure steady during the injection molding cycle, automatically de-stroking the pump as the system approaches set pressure rather than relying on a separate relief valve — reducing both noise and wasted hydraulic power during the pack-and-hold phase.

Installation and Maintenance Considerations

A few points from Rexroth's installation guidance that are easy to overlook:

Suction height: The maximum permissible suction height is limited (around 800 mm per Rexroth's data sheet) — exceeding it risks cavitation.

Case drain routing: The highest case drain port must be connected to the tank, and a check valve should generally be avoided in the case drain line unless specifically required, to prevent trapped pressure in the housing.

Fill before startup: The pump housing must be filled with hydraulic fluid before first commissioning to prevent dry-running damage to internal components.

Electrical components: On electrically controlled variants (EP, EK, etc.), the unit should not be installed in a reservoir below the fluid level unless the components are rated for submersion.

Fluid cleanliness: As with any precision piston pump, contamination control is critical — most premature failures trace back to particulate contamination rather than pure wear.

For more information on the A10VO28 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: Can the A10VO28 be used in a closed-loop hydraulic circuit?

A1: No. The A10VO family is designed specifically for open-circuit applications. For closed-loop systems, Rexroth's A4VG or A10VG families are the appropriate choice.

Q2: What control types are available for the A10VO28?

A2: Common options include DR (pressure control), DFR (pressure and flow control), LR/LRG (load sensing), and EO/EP/EK (electric and electro-proportional controls), among others, depending on the specific application.

Q3:How to purchase an A10VO28 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 A10VO28 hydraulic pump?

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