Rexroth A10VO71 series 32 swashplate hydraulic piston pump

The naming convention on Rexroth pumps is dense, but once you decode it, it tells you almost everything you need to know:

A10VO — Axial piston unit, swashplate design, variable displacement, for open-circuit hydraulic systems.

71 — Displacement (Vg max) of approximately 71 cm³ per revolution.

Series 32 — The design series/generation, which determines mounting dimensions, control options, and which parts are interchangeable with earlier or later series.

In plain terms: it's a mid-size variable pump that converts rotational mechanical energy from a diesel engine or electric motor into hydraulic flow, and it can change how much oil it pumps per revolution without changing shaft speed. That last part is the whole point of a swashplate pump — it's what separates it from a fixed-displacement gear or vane pump.

How the Swashplate Design Works

The Core Mechanism

Inside the pump housing sits a cylinder barrel with a set of pistons arranged in a circle, parallel to the drive shaft. Each piston rides against a swashplate — a tiltable plate set at an angle to the shaft's rotational axis. As the shaft turns, the pistons are forced to move in and out of their bores because they're constantly pressing against that angled plate.

Here's the key part: the steeper the swashplate angle, the longer the piston stroke, and the more oil gets displaced per revolution. Flatten the swashplate toward zero degrees, and stroke length shrinks toward nothing — flow drops to near zero even though the shaft is still spinning at full speed. That's the entire trick behind variable displacement, and it's why this pump family is prized in applications where load and speed demands change constantly.

Why This Matters in the Real World

Take an excavator boom cylinder. When the operator is doing fine grading, they need low flow. When they're digging hard and fast, they need high flow. A fixed-displacement pump can't do both without wasting energy or throttling flow through a valve (which just turns excess hydraulic power into heat). The A10VO71's variable swashplate lets the pump match output to demand in real time, which is a major reason this architecture dominates mobile equipment and load-sensing circuits.

Key Technical Characteristics

While exact figures vary by control option and ordering code, the A10VO71 Series 32 generally falls into these ranges (always confirm exact values against the current Bosch Rexroth datasheet RE 92711 for your specific part number):

Displacement and Pressure

Geometric displacement: ~71 cm³ per revolution (Vg max)

Nominal pressure: typically rated around 250 bar

Peak/intermittent pressure: commonly up to 350 bar depending on control type

Rated shaft speed: in the range of roughly 2,000–2,600 rpm at full displacement, higher at partial displacement

Control Options

This is where the A10VO family really shows its versatility. Depending on the ordering code, a Series 32 unit can be built with:

DR — Pressure control (maintains a set outlet pressure, reduces displacement as pressure rises)

DFR — Pressure and flow control combined

DFLR — Load-sensing control with pressure cut-off

EO — Electric proportional control (displacement set via solenoid current)

HD — Hydraulic displacement control

FED / EP — Various remote and electro-proportional pressure control variants

Each control type changes how the swashplate angle is actuated — some respond to system pressure feedback, others respond to an external electrical or hydraulic command signal. Choosing the right one is arguably more important than the displacement size itself, because it determines how the pump behaves under real operating conditions.

Mounting and Shaft Options

Series 32 units typically support SAE flange mounting, splined shafts (DIN 5480 or SAE), and through-drive capability for tandem or combination pump setups — meaning you can stack a second pump behind it off the same input shaft, which is common on machines needing separate circuits for, say, steering and implement functions.

Installation and Maintenance Notes

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

Case drain matters. Like most axial piston pumps, the A10VO71 needs a properly sized case drain line back to tank, kept below the maximum case pressure spec. Restricted or undersized drain lines are a leading cause of shaft seal failure.

Priming and suction conditions. These pumps are sensitive to inlet vacuum. Suction line diameter, filter condition, and reservoir height relative to the pump inlet all affect service life — cavitation from a starved suction is one of the fastest ways to destroy the piston/cylinder barrel assembly.

Fluid cleanliness. Piston pumps run tight tolerances between pistons and bores. Contamination control (ISO cleanliness codes appropriate to the system pressure) has an outsized effect on how long the pump lasts compared to almost any other single factor.

Control calibration. If you're troubleshooting sluggish or erratic flow response, check the control's zero-stroke and full-stroke adjustment screws before assuming there's internal wear — a surprising number of "bad pump" complaints turn out to be a control that's simply out of adjustment.

For more information on the A10VO71 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: Can I run this pump in a closed-loop circuit?

A1:No. The A10VO family is designed specifically for open-circuit operation, where the pump draws from and returns to a reservoir. Closed-loop applications (like hydrostatic drives) use a different pump family, such as the A4VG or A6VM/A10VG series.

Q2: How do I know if my pump needs an overhaul versus a full replacement?

A2: If the pressure/flow performance has drifted but there's no unusual noise or metal contamination in the case drain oil, a rebuild kit (pistons, cylinder barrel, valve plate, seals) is often sufficient. If there's visible scoring on the valve plate or swashplate, or contamination in the case drain, a full replacement or professional remanufacture is usually more cost-effective than repeated partial repairs.

Q3: How to purchase an A10VO71 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 A10VO71 hydraulic pump?

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