Rexroth A4VTG71 A4VTG90 Pump | A4VTG71HWCSD32L-NLD10F001S-S

The Rexroth A4VTG Series from LIC Hydraulic is the industry-standard axial piston variable pump for concrete mixer drum drives. Ranging from $71\text{cc}$ to $90\text{cc}$ displacements, models like A4VTG71HWCSD32L-NLD10F001S-S and A4VTG090HW100 are engineered for closed-circuit operation. These pumps feature integrated boost pumps and valve technology for a compact, powerful drivetrain. We guarantee 100% mechanical interchangeability and subject every unit to 100% full-load dynamic response testing to ensure professional performance under the most demanding construction site conditions.

Technical Configuration Details

• Displacement Range: $71\text{ cc/rev}$ (A4VTG71) and $90\text{ cc/rev}$ (A4VTG90).

• Control Type (HW): Hydraulic servo control for effortless speed and direction adjustments.

• Operating Pressure: Nominal $400\text{ bar}$ ($5800\text{ psi}$); Peak $450\text{ bar}$ ($6500\text{ psi}$).

• Integrated Components: Charge pump, two cross-sensing high-pressure relief valves, and a charge pressure relief valve.

Key Technical Advantages

• All-in-One Integration: By housing all essential closed-loop valves and the charge pump within a single casing, the A4VTG significantly reduces the external piping required on the truck chassis.

• Responsive HW Control: The hydraulic servo control allows for precise, low-effort modulation of drum speed and rotation (mixing/discharging), ensuring smooth concrete delivery.

• Exceptional Power Density: The 32-series design optimizes internal geometry to provide higher torque output while maintaining a compact footprint, ideal for modern mixer truck engine compartments.

• Rugged Construction: Equipped with heavy-duty swashplate bearings and high-spec viton seals to withstand the vibration and abrasive dust environments typical of cement and concrete production.

Application Areas

• Concrete Mixer Trucks: The primary drive for drums ranging from $6\text{m}^3$ to $12\text{m}^3$ capacity.

• Specialized Mobile Machinery: Closed-loop drives requiring high-pressure rotation control in a compact package.

Expert Maintenance Tips

• Boost Pressure Integrity: The charge pressure is the lifeblood of the A4VTG. Ensure that charge pressure is checked regularly (typically $20\text{–}25\text{ bar}$) to prevent pump cavitation and internal scoring.

• Closed-Loop Filtration: Closed circuits reuse the same fluid constantly. High-efficiency filtration (at least ISO 4406 18/16/13) is mandatory to prevent a single component failure from contaminating the entire loop.

• Thermal Management: Given the high-duty cycle of concrete mixing, verify the function of the motor flushing valve to ensure hot oil is continuously exchanged with cooled oil from the reservoir.