Rexroth A11VLO open-circuit hydrauilc pump for the Doppstadt DW3060 Industrial pulverizer

Application Brand : Doppstadt

Equipment No. : DW3060

SERIES : A11VLO

BRAND : For Rexroth

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FAQ

The A11VLO is a variable-displacement axial piston pump built on a swashplate design, engineered specifically for open-circuit hydrostatic systems. "Open circuit" is the key phrase here — unlike a closed-loop pump feeding a hydrostatic drive motor in a sealed loop, the A11VLO pulls fluid from a reservoir and pushes it out to actuators — cylinders, motors, valve blocks — with the return oil flowing back to the tank. That's exactly the arrangement a shredder needs, because a machine like the DW3060 isn't running one continuous drive loop; it's juggling a dozen different hydraulic consumers at once: the shredding comb cylinders, the conveyor fold-out rams, cooling fan drive, track propulsion, and auxiliary circuits.

A few characteristics define the pump family:

Displacement proportional to drive speed. Flow output scales with engine RPM and swashplate angle, which lets the pump deliver exactly what the circuit demands rather than dumping excess flow over a relief valve.

Infinitely variable flow. The swashplate angle adjusts continuously, so displacement — and therefore flow — can be dialed from zero up to maximum without steps.

Charge pump option on larger frame sizes. On sizes 130 through 260, an integrated impeller-type charge pump keeps the case pre-filled, which allows higher input speeds and much easier cold starts in winter yard conditions.

Nominal pressure of 350 bar, peak 400 bar. That's the standard rating across the series, which comfortably covers the comb-clamping and overload-protection circuits on a shredder that regularly hits contaminated, unpredictable material.

Wide displacement range. The series spans frame sizes from roughly 40 cc/rev up to 260 cc/rev, so the exact pump fitted to a given DW3060 depends on the machine's year, engine, and hydraulic package — this is not a one-size-fits-all part number.

Why Doppstadt Pairs This Pump With the DW3060

The DW3060 is a slow-speed, single-shaft shredder — a 3-meter roller turning around 31 rpm, tearing material against a hydraulically controlled comb, built to process C&D debris, green waste, wood, and mixed municipal waste at throughput rates that can reach 40–60 tonnes per hour depending on configuration. Nothing about that job is gentle. The comb has to open automatically the instant it meets something the machine can't chew — rebar, a chunk of concrete, a stray engine block — and it has to do that in a fraction of a second to avoid drivetrain damage.

That overload-protection behavior is a hydraulic control problem before it's a mechanical one. The system needs:

Fast, precise pressure response so the comb can react to a spike in resistance almost instantly

Enough flow reserve to run the comb, the conveyor, cooling, and auxiliary circuits simultaneously without one circuit starving another

Tolerance for dirty, demanding duty cycles over thousands of operating hours

A control architecture (pressure cut-off, load-sensing, or power control, depending on the machine's regulator setup) that lets the operator trust the machine to protect itself

An axial piston pump with a swashplate design and a broad menu of control options — pressure control, load-sensing, power control, electric proportional control — checks all of those boxes, which is why this pump family shows up across so much mobile and construction equipment, not just Doppstadt's line. On the DW3060 specifically, it's typically paired with an LRDS-style or comparable load-sensing regulator, letting the pump destroke automatically once the shredding comb reaches its set clamping pressure rather than dumping flow to tank.

Maintenance Practices That Actually Extend Pump Life

Respect the viscosity chart. Rexroth publishes an optimum operating viscosity range against tank and ambient temperature. Running the wrong ISO VG grade for your climate is one of the most common — and most preventable — causes of premature wear on this pump family.

Never exceed 115°C anywhere in the system. That's the hard ceiling Rexroth specifies for fluid temperature at any point in the circuit, not just at the tank.

Watch suction height on non-charge-pump variants. Frame sizes without an integrated charge pump have a maximum permissible suction height of 800 mm; exceeding it invites cavitation, which shows up as noise first and pitted pistons later.

Don't skip cold-start discipline. In cold yard conditions, let the charge pump prime the case and bring viscosity into range before commanding full displacement — this is exactly the scenario the charge pump option exists to solve.

Track hours against gearbox and pump service intervals separately. Doppstadt documentation for the DW3060 line typically calls for major gearbox inspection around 3,800 operating hours; hydraulic component wear doesn't follow the same clock, so don't assume "the gearbox was fine" means the pump is too.

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Application equipment brands	Application equipment No.
Doppstadt	DW3060

Q1: Is the A11VLO an open-circuit or closed-circuit pump?

A1: Open circuit. It draws fluid from a reservoir and returns it to the tank after the actuator, which is the correct architecture for a shredder running many independent hydraulic functions rather than a single closed drive loop.

Q2: What pressure should I expect from this pump on a DW3060?

A2: The A11VLO series is rated for 350 bar nominal pressure and 400 bar peak. Actual working pressure on the shredding comb circuit is set by the regulator (pressure cutoff, load-sensing, or power control) and should match Doppstadt's documented setting for your specific machine configuration — don't assume the pump's maximum rating is the intended operating setpoint.