Rexroth A4VG Series Pump | A4VG28, A4VG90, A4VG250 | High Pressure Closed Circuit Pump | EP4D1, DA2D2

Rexroth A4VG Series High-Pressure Closed Circuit Variable Piston Pumps

Product Overview: The Rexroth A4VG series is the premier power component for global closed-circuit hydrostatic drives in mobile machinery. This series is engineered to meet the high-pressure demands of heavy vehicle travel control, vibratory roller drives, and concrete pump truck steering. It covers a comprehensive spectrum from the mainstream 28cc (A4VG28) to the high-power 250cc (A4VG250). Featured control modalities include DA2D2 (Hydraulic speed-related control) and EP4D1 (Electronic proportional control with pressure cut-off). With its compact integrated design, including a built-in charge pump and high-pressure relief valves, the A4VG delivers exceptionally smooth and responsive power at a rated pressure of 400 Bar.

Key Technical Advantages:

• Highly Integrated Closed-Loop System: Features a built-in charge (boost) pump and full set of relief valves, simplifying external piping and enhancing overall machine reliability.

• Intelligent DA Speed Control: The DA2D2 (2/4/6/8) controller automatically modulates pump displacement based on engine RPM, ensuring the travel system stays within the optimal fuel efficiency range.

• Precision EP Electronic Proportional Control: EP4D1 offers high-precision electric regulation with pressure cut-off, a critical feature for modern automated construction machinery requiring autonomous travel control.

• Extreme Power Density: Optimized for Series 32/40 platforms, providing massive torque within a compact frame to handle the frequent starts, stops, and reversals of mobile equipment.

• Versatile Mounting Interfaces: Offers various specifications like NSD02F721S and NSF02F021S, ensuring a seamless “drop-in” fit with specialized gearboxes and power take-offs.

Detailed Models & Parameters:

• Core Series: Rexroth A4VG Series 32 & 40 (Closed Circuit).

• Full Displacement Range: A4VG28, A4VG40, A4VG45, A4VG50, A4VG56, A4VG71, A4VG90, A4VG125, A4VG140, A4VG180, A4VG250.

• Core Control Keywords: DA2D2 (2/4/6/8), EP4D1, HW, DG.

• Pressure Ratings: Rated at 400 Bar (5800 PSI) continuous; Peak capability up to 450 Bar (6500 PSI).

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

• Target Applications: Roller travel systems, paver drives, rotary drilling rigs, concrete pumps, and crane travel mechanisms.