Rexroth A20VG45 Series Hydraulic Pump | A20VG045HT1003M1/11AR | High Pressure Piston Pump

The Rexroth A20VG Series from LIC Hydraulic is a sophisticated Double Axial Piston Variable Pump engineered for closed-circuit hydrostatic transmissions. Specifically designed for machines with dual-path drives, the A20VG045HT1003M1/11AR integrates two independent rotating groups into a single, space-saving housing. This architecture allows for synchronized or independent control of two hydraulic motors, making it the ideal solution for tracked vehicles and high-precision pavers. We offer 100% drop-in replacements for original Rexroth units, ensuring OEM-level volumetric efficiency and dynamic control.

Technical Highlights

• Series: A20VG (Dual Closed Circuit)

• Displacement: $45\text{ cm}^3\text{/rev}$ per circuit.

• Nominal Pressure: $300\text{ bar}$ ($4350\text{ psi}$).

• Peak Pressure: $350\text{ bar}$ ($5075\text{ psi}$).

• Integrated Components: Charge pump, high-pressure relief valves, and boost valves.

• Control Types: Hydraulic Pilot (HT), Manual (HD), or Electronic (EP) options.

Core Advantages

• Space-Efficient Design: Consolidating two pumps into one housing drastically reduces the footprint and the number of hydraulic lines, simplifying the chassis layout for compact machinery.

• High Operational Stability: The balanced internal design ensures that both circuits respond equally to control signals, providing stable straight-line tracking for pavers and agricultural harvesters.

• Robust Construction: Hardened swash plates and precision-engineered piston shoes are designed to handle the frequent load reversals typical of closed-loop hydrostatic drives.

• Lower Maintenance Complexity: By sharing a single suction line and charge pump system, the A20VG simplifies the filtration and cooling requirements of the hydraulic system.

Application Areas

• Road Construction: Track drives for asphalt pavers and vibratory systems for soil compactors.

• Agriculture: Traction drives for self-propelled harvesters and high-clearance sprayers.

• Specialized Vehicles: Tracked carriers, drilling rigs, and heavy-duty industrial crawlers.

Expert Maintenance Tips

• First Run Protocol: Never start the engine without first filling the pump case with filtered oil. Additionally, verify that the charge pressure is within the factory specification (usually $20\text{–}25\text{ bar}$) before applying full load.

• Filter Integrity: Closed-loop systems recycle oil. Any debris from a motor failure can quickly reach the pump. Always replace the system filters and flush the lines if a downstream component fails.

• Thermal Management: Ensure the case drain line is not restricted. Excessive case pressure can lead to shaft seal failure and overheating of the rotating groups.