Strategic Benefits & System-Level Optimisation

To get the most from the A10VO28, one must look beyond the datasheet and harness its performance and longevity advantages through thoughtful system engineering.

Energy Efficiency and Heat Reduction – A Game Changer

The pump’s standout benefit is its substantial energy savings. Unlike fixed‑displacement units that continuously pump full flow and dump surplus over a relief valve (wasting power as heat), the A10VO28’s ability to reduce stroke on demand is revolutionary. Take the holding phase of an injection moulding machine: the pump sustains full clamping pressure (e.g., 280 bar) while delivering only the tiny flow needed to top up internal leakage. This alone can cut hydraulic power consumption by more than 80% during that period, lowering electricity bills and downsizing the cooling system required.

Built to Last in Rugged Conditions

The 31 Series is engineered for extended service. Its rotating group – comprising a hardened cylinder barrel and piston assembly running on a hydrostatically lubricated valve plate – delivers excellent volumetric efficiency and long intervals between overhauls. While the pump tolerates some contamination, fluid cleanliness remains the decisive factor for lifespan. Strictly following Rexroth’s filtration recommendations (maintaining ISO 4406 19/17/14 or better) is the single most effective preventive step to avoid control‑valve sticking, port‑plate erosion, and early failure – ensuring a solid return on your investment.

Application-Specific Use Cases

Thanks to its compact power and smart control, the A10VO28 serves a wide range of industries.

• Mobile off‑highway equipment – Found in compact loaders, telehandlers, and aerial lifts. The load‑sensing feature delivers smooth, proportional attachment control, improves operator comfort, and cuts diesel consumption by avoiding unnecessary pump flow when not needed.

• Industrial manufacturing – Used in mould clamping circuits for injection moulding and die‑casting. The pump provides fast closing at low pressure, then seamlessly shifts to high‑pressure, low‑flow holding – optimising both cycle time and energy per part. Also common in smaller presses and machine‑tool auxiliary functions.

• Testing and simulation – The pump’s stable, accurate pressure control makes it ideal for fatigue test rigs, component validation stands, and flight simulator motion systems. Its ability to reproduce complex pressure profiles with high consistency is invaluable for R&D and certification.

Integration Principles and Proactive Diagnostics

Fundamental Design Rules

To extract full performance, the system layout must be carefully considered. A correctly sized charge pump (often an internal‑gear type) is essential – it supplies positive suction pressure to the main pump, prevents cavitation, and provides cooling flow. The main system relief valve should be set about 10‑15% higher than the pump’s compensator setting, so it only acts as a true safety backup. Using a high‑beta return‑line filter, and properly sizing the reservoir and oil‑to‑air cooler, are critical for maintaining fluid condition and managing thermal balance.