Bosch Rexroth A11VO axial piston hydraulic pump for the Soilmec Pile driver 50770112 50770113 50770122 50770123 50770134 50770200

The A11VO is a variable displacement axial piston pump built on a swash-plate design, part of Bosch Rexroth's well-established A11V/A11VO/A11VLO product family. It's engineered for open-circuit hydraulic applications where high pressure, variable flow, and dependable power density matter — exactly the conditions found in heavy construction and foundation equipment.

Why Soilmec Chooses the A11VO for Pile Driving Rigs

Soilmec builds rotary drilling rigs, CFA (continuous flight auger) rigs, and piling equipment used in deep foundation work — bored piles, diaphragm walls, micropiles, and displacement piling. These machines demand a hydraulic power source that can swing between two very different operating states: high-torque, low-speed drilling through variable soil conditions, and rapid, high-flow movement during auger extraction, kelly bar handling, or hammer cycling.

The A11VO's variable displacement behavior is precisely what makes this possible on a single power unit.

Matching Torque to Ground Conditions

When a Soilmec rig's rotary head encounters a dense clay layer or bedrock, the operator needs torque, not speed. The A11VO's control system reduces flow and lets system pressure climb, effectively converting engine power into torque at the rotary drive. As the auger breaks through into softer strata, displacement increases again, restoring speed. This constant modulation happens automatically through the pump's pressure and power control functions — the operator doesn't have to babysit it.

Power Sharing Across Multiple Functions

A pile driver isn't running one hydraulic function at a time — rotation, crowd, winch, and mast leveling often operate together. Because several A11VO units (or A11VO paired with other Rexroth A-series pumps like the A4VG for closed-circuit travel) can be through-driven off a single diesel engine, Soilmec's hydraulic architects can allocate flow and pressure precisely where the job needs it at any given moment, without oversizing the prime mover.

Key Technical Specifications Operators Should Know

While exact figures vary by frame size (the A11VO is offered in multiple displacement sizes, commonly from around 40 cm³ up to 260 cm³ per revolution), the family shares common characteristics relevant to Soilmec applications:

Displacement range: roughly 40–260 cm³/rev depending on model size

Maximum operating pressure: typically up to 350 bar continuous, with intermittent peaks higher

Drive speed range: engineered for standard diesel-engine PTO speeds, generally in the 1,000–2,700 rpm range depending on size

Control options: DR (pressure control), FR/EP (electronic proportional), LR (load-sensing), and combinations thereof — Soilmec typically specifies load-sensing or electronic control variants for precise rig response

Mounting: SAE flange standard, compatible with through-drive gearboxes common on piling rig power packs

Because Soilmec integrates these pumps into a broader hydraulic circuit with proportional valves, load-sensing manifolds, and onboard rig electronics, the exact control variant fitted matters a great deal for diagnostics — always confirm the control type from the rig's hydraulic schematic before ordering a replacement or exchange unit.

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Q1: Why not use a fixed-displacement pump on a pile driver instead?

A1: Fixed-displacement pumps deliver constant flow regardless of load, which wastes power and generates heat whenever full flow isn't needed — a poor match for piling work, where torque demand swings constantly as the auger or kelly bar moves through different soil layers.

Q2: How long does an A11VO pump typically last on a piling rig?

A2: Service life varies enormously based on fluid cleanliness, duty cycle severity, and maintenance discipline, but well-maintained units in properly filtered systems commonly run several thousand operating hours before requiring an internal rebuild. Poor fluid management can cut that dramatically.

Q3: What is the price and delivery time of the A11VO hydraulic pump for the Soilmec Pile driver?

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 the Soilmec Pile driver?

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