Rexroth A4VG125 Series Pump | A4VG125EP4, A4VG125DA | 400 Bar Closed Circuit Piston Pump

Rexroth A4VG125 Series (Series 32) Closed Circuit Variable Piston Pump

Product Overview: The Rexroth A4VG125 is a high-performance variable displacement pump engineered specifically for heavy-duty Closed Circuit hydrostatic transmissions within the renowned Series 32 family. Featuring a 125cc displacement and a rated operating pressure of 400 Bar, the A4VG125 serves as the robust heart of heavy machinery drive trains. It integrates a high-capacity charge pump, high-pressure relief valves, and sophisticated control options such as EP4 (Electric Proportional) and DA (Speed-related). Its exceptional power density and durability deliver precise stepless speed regulation and massive traction for heavy-duty construction vehicles and specialized machines.

Key Technical Advantages:

• Heavy-Duty Closed-Loop Architecture: Optimized for high-torque drive systems. Direct fluid circulation between pump and motor ensures rapid response and high energy efficiency, particularly during frequent directional changes and extreme load cycles.

• Versatile Precision Controls:

  • EP4 Electric Proportional Control (A4VG125EP4): Seamless stepless displacement modulation via proportional solenoids, enabling integration with Electronic Control Units (ECUs) for smooth and repeatable driving characteristics.

  • DA Speed-Related Control (A4VG125DA): Displacement automatically adjusts relative to drive speed, providing an intuitive “driving feel” ideal for rotary drilling rigs and heavy construction vehicles.

• Ultra-High Pressure Reliability: Rated for an operating pressure of 400 Bar (40 MPa) with peak cycles reaching 450 Bar. Reinforced rotating groups and large-scale swashplate designs ensure an extended service life under continuous heavy load.

• Highly Integrated Design: Internal integration of charge pressure valves and high-pressure relief valves streamlines external plumbing, reducing potential leakage points and maintenance costs.

• Flexible Through-Drive Performance (F02/F11): Supports tandem mounting of secondary pumps (such as A4VG or A10V series) from a single drive shaft to power steering, braking, or auxiliary hydraulic systems in complex machinery.

Detailed Models & Parameters:

• Core Series: Rexroth A4VG Series 32.

• Representative Models: A4VG125EP4DM1/32R-NZF02N00XEH-S, A4VG125DAD2/32R-NAF02F011BP.

• Displacement: 125 cm³/rev.

• Pressure Ratings: Rated at 400 Bar (40 MPa); Peak capabilities up to 450 Bar (6500 PSI).

• Rotation: R (Clockwise / Right-hand rotation).