Rexroth A4VG Series Pump | A4VG56, A4VG90, A4VG125 | 400 Bar Closed Circuit Piston Pump

Rexroth A4VG Series (Series 32) Closed Circuit Variable Piston Pump

Product Overview: The Rexroth A4VG series is a high-performance variable displacement pump engineered for Closed Circuit hydrostatic transmissions in mobile machinery. This series spans a comprehensive range from the compact 28cc (A4VG28) to the heavy-duty 250cc (A4VG250). As a global benchmark in hydrostatic drives, the A4VG delivers precise flow control under continuous pressures of 400 Bar. Flagship models like the A4VG56DA (Speed-related control) and A4VG56EP (Electric proportional control) feature integrated charge pumps and high-pressure relief valves, providing superior traction and maneuverability for excavators, concrete pumps, and road machinery.

Key Technical Advantages:

• Heavy-Duty Closed-Loop Design: Optimized for hydrostatic transmissions. Direct fluid circulation between the pump and motor ensures rapid response, minimal energy loss, and exceptional hydrostatic braking.

• Sophisticated Control Modalities:

  • DA Speed-Related Control (A4VG56DA): Output flow adjusts automatically based on drive speed, providing intuitive “driving feel” for operators of rotary drilling rigs.

  • EP Electric Proportional Control (A4VG56EP): Features stepless displacement modulation via proportional solenoids, enabling seamless integration with Electronic Control Units (ECUs) for smart travel.

• Maximum Power Density: Delivers rated pressures up to 400 Bar (5800 PSI) and peak capabilities of 450 Bar within a remarkably compact installation footprint.

• Highly Integrated Components: Internally integrates the charge pump, high-pressure relief valves, charge pressure relief valves, and cut-off valves, drastically simplifying external plumbing.

• Through-Drive Capability (F02/F07): Supports tandem mounting of secondary pumps (piston or gear) to power auxiliary functions like steering or braking.

Detailed Models & Parameters:

• Core Series: Rexroth A4VG Series 32.

• Displacements: 28, 40, 56, 71, 90, 125, 180, 250 cm³/rev.

• Representative Models: A4VG56DA1D2/32R-NZC02F025FH, A4VG56EP2D1/32L-NAC02F075SH.

• Rated Pressure: 400 Bar (5800 PSI).

• Rotation: R (Clockwise); L (Counter-clockwise).