Rexroth A7VO Series Pump | A7VO28, A7VO55 | 350 Bar Bent Axis Variable Pump

Rexroth A7VO Series Bent Axis Axial Piston Variable Pump

Product Overview: The Rexroth A7VO series is a high-efficiency variable displacement unit recognized globally for its advanced Bent Axis design. Compared to swashplate-type pumps, the A7VO offers superior self-priming capabilities and higher mechanical efficiency in open circuit systems. Covering essential displacements such as 28cc and 55cc, and equipped with the sophisticated LRDS power regulator, this series dynamically modulates displacement to match engine output perfectly. It serves as the premier power source for excavator main systems and heavy-duty Industrial Power Units (HPU).

Key Technical Advantages:

• Superior Bent Axis Technology: The unique bent axis architecture allows for larger swivel angles, delivering massive power density while maintaining exceptional reliability and low noise levels at high rotational speeds.

• Precise Multi-Functional Control (LRDS/DR): * A7VO55LRDS/63L-NZB01-S: Features integrated Power Limiting (LR), Pressure Comp (D), and Load Sensing (S). This allows the pump to sense real-time demand, preventing engine stalls and maximizing energy savings.

  • A7V028DR/61L-NPB01: Standard DR constant pressure control automatically de-strokes the pump once the set pressure is reached, safeguarding the hydraulic circuit.

• Heavy-Duty High-Pressure Performance: Rated at a continuous 350 Bar (35 MPa / 5100 PSI) with peak cycles up to 400 Bar. Its robust bearing design is specifically engineered to handle the intense cyclic loads found in construction machinery.

• OEM-Grade Compatibility: Manufactured to Rexroth Series 61/63 standards, ensuring precise interchangeability for mounting flanges and shaft ends (e.g., NPB/NZB specs) for seamless aftermarket maintenance.

Detailed Models & Parameters:

• Core Series: A7VO (Series 61 / 63).

• Representative Models: A7VO28, A7VO55, A7V028DR/61L-NPB01, A7VO55LRDS/63L-NZB01-S.

• Displacement: 28 cm³/rev, 55 cm³/rev.

• Pressure Ratings: Rated at 350 Bar; Peak cycles up to 400 Bar.

• Control Methods: LRDS (Power Control / Load Sensing / Pressure Cut-off), DR (Constant Pressure Regulation).