Rexroth A4VG56 Double Pump | A4VG180 Axial Piston Pump | A4VG56EP4DT1/32R

The Rexroth A4VG Series 32 from LIC Hydraulic represents the pinnacle of High-Pressure Axial Piston Pumps for closed-circuit applications.

• A4VG56 Tandem Set: Features two 56cc pumps in a through-drive configuration, enabling synchronized control of two independent hydraulic circuits—perfect for dual-track drives.

• A4VG180: A heavy-weight champion providing $180\text{ cc/rev}$ displacement for high-power industrial and construction requirements.

  Our A4VG units provide 100% drop-in replacements for original Rexroth specifications, ensuring seamless integration and OEM-standard volumetric efficiency.

Technical Highlights

• Control Types: EP (Electric Proportional) and DW (Speed-related Hydraulic) options.

• Pressure Rating: Nominal $400\text{ bar}$ ($5800\text{ psi}$), Peak $450\text{ bar}$ ($6525\text{ psi}$).

• Built-in Systems: Integrated charge pump and relief valve logic.

• Tandem Capability: Fully supported through-drive for auxiliary pumps or secondary A4VG units.

Core Advantages

• Precision Tandem Synchronization: The A4VG56 tandem assembly is factory-calibrated to ensure identical response times across both circuits, maintaining precise straight-line tracking for pavers and harvesters.

• High Power Density: Engineered to provide massive torque output within a compact frame, ideal for engine bays where space is at a premium.

• Advanced Control Dynamics: The Series 32 EP4 control offers superior linearity and repeatability, essential for modern automated vehicle management systems.

• Robust Build Quality: Hardened rotating groups and reinforced swash plates ensure long-term durability under continuous high-pressure cycles.

Application Areas

• Road Construction: Main traction drives for heavy asphalt pavers and vibratory rollers.

• Foundation Drilling: Rotary head drives and crawler tracking for large drilling rigs.

• Mining & Industry: Conveyor drives, tunnel boring machine (TBM) propulsion, and heavy-duty carriers.

Expert Maintenance Tips

• Case Bleeding: For tandem sets, ensure both pump cases are filled with oil before startup. Air trapped in the rear pump can lead to catastrophic bearing failure.

• Charge Pressure Balance: In dual-circuit systems, monitor the charge pressure of both units. An imbalance can lead to sluggish response in one circuit compared to the other.

• Suction Line Integrity: Ensure the shared suction line is large enough to handle the combined flow of both charge pumps to prevent cavitation.