描述

A10VO Series A10VO10 A10VO18 A10VO28 A10VO45 A10VO63 A10VO85 Axial Piston Pumps Hydraulic Pump

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.