Rexroth A10VO71 hydraulic pump AA10VO71 ALA10VO71 APA10VO71 axial piston pumps

The A10VO71 is a variable displacement, axial piston pump in swashplate design, intended for open circuits. Its "71" designation refers to a geometric displacement of 71 cm³ per revolution. At 1800 RPM, this translates to a theoretical flow rate of approximately 128 L/min (33.8 GPM), making it ideal for mid-range excavators, forklifts, and marine steering gear.

Common features across all variants include:

Through-drive capability (for mounting additional pumps)

Pressure ratings: Nominal 280 bar (4060 psi), peak 350 bar (5075 psi)

Control options: DR (pressure), DFR (load sensing), DRS (pressure-flow), and LR (torque limiting)

Decoding the Variants: AA10VO71 vs. ALA10VO71 vs. APA10VO71

While often used interchangeably, these suffixes denote specific modifications. Let’s clarify each.

AA10VO71: The Industrial Standard

The AA10VO71 prefix indicates the standard, unmodified industrial configuration. It features ISO or SAE mounting flanges (typically 2-bolt or 4-bolt), standard shaft ends (splined or keyed), and nitrile or FKM shaft seals rated for mineral oils.

When to specify: Use this for stationary industrial applications like presses, conveyor drives, or test benches where ambient temperatures and fluid conditions are predictable.

ALA10VO71: The Long-Life / Low-Speed Variant

The ALA10VO71 is engineered for low-speed, high-torque scenarios. The "L" often signifies reinforced bearings or a specialised cylinder block spring mechanism that maintains preload at speeds below 500 RPM. Without this, standard units can suffer from metal-to-metal contact due to insufficient centrifugal force.

Real-world example: A steel mill crane traverse drive operating at 300 RPM for positioning. The ALA10VO71 prevents slipper lift-off and premature swashplate wear.

APA10VO71: The High-Pressure / Special Material Option

The APA10VO71 typically indicates improved tribology—often steel-on-steel friction pairs or enhanced bronze plating for the valve plate. In some Rexroth documentation, "APA" points to a version with a modified pressure compensator spool for faster response times (<50 ms).

Critical application: Hydraulic power units (HPUs) for injection moulding machines requiring rapid pressure buildup and decompression cycles. The APA variant reduces cavitation erosion on the valve plate.

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Specifications

Selection Table