Bosch Rexroth A10VO open-circuit hydraulic pump for the Komatsu wheel loader 840220098 840220102 840220122 840220140 840220143 5050005 5214557

The A10VO is a swash-plate-design, variable-displacement axial piston pump built by Bosch Rexroth, a German engineering firm with a long history in industrial and mobile hydraulics. It's designed specifically for open-circuit systems, meaning it draws fluid from a reservoir, pressurizes it, and sends it out to actuators — as opposed to a closed-circuit pump that recirculates fluid directly between the pump and motor.

Why Komatsu Wheel Loaders Use the A10VO

Komatsu wheel loaders — from compact models to large production-class machines — rely on precise, responsive hydraulics for bucket control, boom lift, and articulated steering. The A10VO's variable displacement behavior directly supports that.

Matching Pump Output to Loader Hydraulic Demands

A wheel loader's hydraulic demand is anything but constant. Idling in a queue at a stockpile needs almost no flow; breaking into a dense pile with the bucket while steering hard needs a lot, right now. A fixed-displacement pump would either waste horsepower and fuel at low demand or struggle at peak demand. The A10VO's pressure and flow compensation (through DR, DFR, or similar control options) lets the pump deliver only what the system calls for, improving fuel efficiency and reducing heat generation in the hydraulic oil — a real factor in pump and hose longevity.

Common Komatsu Models Using A10VO-Type Pumps

A10VO-series pumps (and Komatsu OEM equivalents built to the same architecture) show up across several Komatsu wheel loader families, often for steering and pilot/implement circuits, including machines in the WA100 through WA500 range depending on model year and configuration. Because Komatsu has used Rexroth-licensed and Rexroth-manufactured components across multiple generations, it's important to confirm the exact pump size and control type against your machine's serial number and parts catalog rather than assuming interchangeability across model years.

Key Technical Specifications

The A10VO is produced in a range of displacement sizes (commonly denoted by a number after the model code, such as A10VO28, A10VO45, A10VO60, A10VO71, A10VO85, A10VO100, and A10VO140), where the number roughly indicates displacement in cubic centimeters per revolution. Each size has its own rated pressure, maximum speed, and flow output.

Displacement and Pressure Ratings

Broadly speaking, A10VO pumps are built for:

Nominal pressure in the 280–350 bar range, with peak pressures higher for intermittent loads

Displacement sizes scaling with the loader's hydraulic circuit demand — smaller compact loaders use smaller displacement pumps; larger production loaders need higher-displacement units

Variable speed operation, matched to the engine's PTO or gearbox drive ratio

Because exact figures vary by displacement size, control variant, and even production revision, always cross-check the nameplate data or the pump's model code against Bosch Rexroth's official datasheet or Komatsu's parts documentation before ordering or setting relief valves.

Control Options (DR, DFR, and Others)

The A10VO is available with different control heads that determine how the swash plate angle is regulated:

DR (pressure control): limits maximum pressure by reducing displacement as pressure approaches the set point

DFR (pressure and flow control): combines pressure limiting with load-sensing flow control, common on loaders needing responsive implement control

EL/HD electric and hydraulic remote controls: used where the pump needs to respond to electronic signals from the machine's control system, increasingly common on newer Komatsu loaders with electrohydraulic controls

Choosing the correct control variant matters — swapping in the wrong control head can leave a loader with sluggish response or, worse, pressure spikes the downstream components weren't designed for.

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Q1: What does "open circuit" mean for the A10VO pump?

A1: It means the pump draws hydraulic fluid from a reservoir and returns spent fluid to that same reservoir, rather than recirculating fluid in a closed loop directly to a motor. This is the standard setup for loader work functions like steering, lift, and tilt.

Q2: Does the A10VO pump affect fuel efficiency on a wheel loader?

A2: Yes. Because it's a variable displacement pump, it only pressurizes and moves the volume of fluid actually needed by the circuit at any given moment, rather than running at full output constantly. This reduces parasitic engine load compared to fixed-displacement pumps, which can measurably improve fuel efficiency over a duty cycle.

Q3:What is the price and delivery time of the A10VO hydraulic pump for the Komatsu wheel loader?

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase an A10VO hydraulic pump for the Komatsu wheel loader?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.