Rexroth A10VO74 series 31 open-circuit axial piston hydraulic pump

The A10VO is Bosch Rexroth's variable-displacement, swashplate-type axial piston pump built for open-circuit hydraulic systems.

Key Technical Characteristics

Displacement and Flow

At full swashplate angle, the A10VO74 delivers flow proportional to shaft speed and its ~74 cc/rev geometric displacement. Drop the swashplate angle and flow output falls off smoothly and proportionally — there's no step change, which is exactly why these pumps feel so controllable in the field compared to fixed-displacement gear or vane pumps paired with proportional relief valves.

Pressure Ratings

Like the rest of the A10VO family, the 74-size unit is built for continuous operation in the 280–350 bar range with peak pressure capability somewhat higher for intermittent conditions. Exact figures vary by control type and specific sub-variant, so the nameplate and Rexroth's official data sheet for the precise ordering code are the final word — don't assume two pumps with the same "74" designation but different suffixes are pressure-interchangeable.

Control Options

This is where the Series 31 line really shows its flexibility. Common control variants include:

DR – pressure control, holds a set maximum system pressure by de-stroking the pump

DFR – combined pressure and flow (load-sensing style) control

DFLR – load-sensing control with a remote pressure compensator option

EO/EP – electrically operated proportional controls, useful when a PLC or machine controller needs direct authority over flow

LA – electric proportional control with a manual override

Choosing the right control isn't cosmetic — it changes how the whole machine behaves. A DFR pump on an excavator, for instance, lets the operator get smooth, load-sensitive control at the joystick, while a straightforward DR pump on a press might be all that's needed for a simple pressure-limited application.

Mounting and Shaft Configuration

The Series 31 housing supports standard SAE flange mounting and a choice of splined or parallel keyed shafts, which is part of why it's so common as a direct-mount pump on diesel engines, electric motors, or through-drive setups feeding a second pump.

Installation and Maintenance Considerations

Fluid Cleanliness Comes First

Axial piston pumps run tight piston-to-bore clearances by design, and the A10VO74 is no exception. Contaminated oil is, by a wide margin, the leading cause of premature wear on the pistons, swashplate, and valve plate. A properly rated inline filter and regular oil analysis will do more for pump life than almost anything else on this list.

Case Drain Monitoring

The case drain line carries internal leakage back to the tank, and its flow rate is one of the best early indicators of internal wear. A sudden increase in case drain flow — especially paired with rising case temperature — is usually the first sign the pump needs attention before it fails outright.

Correct Priming and Start-Up

Like most piston pumps, the A10VO74 needs priming with clean oil before first start and should never run dry, even briefly. On new installations or after a rebuild, crack the highest port fitting to bleed air, then start at a controlled, low speed to protect the pump from cavitation damage.

Matching Control Type to Application

When replacing a pump, matching the exact control suffix matters as much as matching displacement. A DR pump swapped in where a DFR was originally specified will change machine behavior — sometimes subtly, sometimes in a way that makes the machine unusable — so always cross-reference the full Rexroth material number, not just the "A10VO74" portion.

For more information on the A10VO74 hydraulic pump, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: How do I know which control type my pump has?

A1: Check the full model/material number on the nameplate — the control type is encoded right after the displacement figure (for example, the "DFR" in A10VO74DFR/31R...). Cross-referencing that full code against Rexroth's catalog is the only reliable way to confirm.

Q2: What's the biggest cause of early failure in these pumps?

A2: Contaminated hydraulic fluid, by a large margin, followed by running the pump dry during startup or after a dry-out from a leak, and operating outside the pressure or speed ratings for the specific variant installed.

Q3: How to purchase an A10VO74 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 A10VO74 hydraulic pump?

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