Bosch Rexroth A11VO variable piston hydraulic pump for Metso Minerals equipment 706203377360 9651095900 9651511600 9657660100

The A11VO is a series of variable-displacement axial piston pumps manufactured by Bosch Rexroth. These pumps operate on the swashplate design principle, meaning the angle of an internal swashplate determines the piston stroke length, which in turn determines the flow output — without requiring a change in pump speed.

The A11VO lets a machine change how much hydraulic fluid it's pushing, on the fly, without the engine or motor speeding up or slowing down. That's what makes it so valuable in crushing and screening applications, where load conditions change constantly depending on feed material, rock hardness, and throughput demand.

Why Metso Minerals Uses the A11VO

Metso Minerals (now part of Metso Corporation following its merger with Outotec) builds crushing, screening, and material-processing equipment used in quarries, mines, and aggregate operations worldwide. Their mobile and stationary crushers — including models in the Lokotrack, Nordberg, and Metso HP/GP cone crusher lines — rely heavily on hydraulic power for:

Adjusting the crusher setting (CSS) under load

Tramp iron release systems

Hydraulic clearing of blocked crushing chambers

Conveyor and feeder drive systems

Cooling and lubrication circuit pumps

The A11VO fits this application well because crusher hydraulics don't run at a constant load. A cone crusher processing hard granite behaves very differently from one running softer limestone, and feed rates vary by the minute. A fixed-displacement pump would waste energy or struggle to keep up; the A11VO's variable output matches flow to actual demand, which improves fuel efficiency in diesel-powered mobile units and reduces heat generation in the hydraulic circuit.

How the A11VO Works: A Closer Look

The Swashplate Mechanism

Inside the pump housing, a cylinder barrel holds a set of pistons arranged parallel to the drive shaft. These pistons ride against a swashplate set at an angle. As the shaft rotates, each piston is forced in and out of its bore by the swashplate angle, drawing in fluid on one stroke and expelling it under pressure on the other.

Change the angle of the swashplate, and you change how far each piston travels — which changes displacement per revolution. At zero angle, the pump produces no flow even while spinning. This is the mechanical foundation of every variable piston pump, and it's why the A11VO can idle, low-flow, or full-flow without ever changing shaft speed.

Control Variants Commonly Found on Metso Equipment

DR control — Pressure compensator that reduces displacement automatically as system pressure approaches a set maximum, protecting the circuit from overpressure

EP control — Electric proportional control allowing the plant's control system (often a PLC) to command displacement directly, useful for automated crusher setting adjustment

DFR control — Combines pressure and load-sensing control for applications needing tighter flow matching

Which variant is installed depends on the specific Metso model and the vintage of the machine, so matching the correct control type is critical when sourcing a replacement — a DR pump will not behave like an EP pump even if the base displacement is identical.

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Q1: Is the A11VO the same pump across all Metso equipment models?

A1: No. While the base A11VO series shares its swashplate design, Metso specifies different frame sizes and control variants depending on the machine model, hydraulic circuit design, and power requirements. Always verify by serial number rather than assuming interchangeability.

Q2: How do I know if my A11VO pump is failing versus another component in the circuit?

A2: Common diagnostic steps include checking case drain flow (excessive flow indicates internal wear), monitoring pump outlet pressure against expected values, and isolating the pump from downstream valves and actuators to rule out other causes. A hydraulic technician with pressure and flow test equipment can usually confirm pump condition within an hour on-site.

Q3: What is the price and delivery time of the A11VO hydraulic pump for Metso Minerals equipment？

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

Q4: How to purchase an A11VO hydraulic pump for Metso Minerals equipment?

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