Rexroth A7VO55LRDS Series High-Pressure Variable Axial Piston Pump for Concrete Pump Truck Boom

Product Overview:
The A7VO55LRDS is a high-performance bent-axis design axial piston pump from the renowned Rexroth A7VO series. Specifically engineered for open circuit hydraulic systems, this variable pump delivers exceptional power density, reliable operation, and precise control under extreme loads . With a displacement of 55 cc/rev and the advanced LRDS power control (pressure/flow/power control), it provides stepless, load-sensing adjustment for demanding mobile and industrial applications. This unit is a direct, high-quality replacement solution for original Rexroth equipment .

Technical Specifications:

• Model: A7VO55LRDS/63L-NZB01-S

• Type: Bent-axis design, variable axial piston pump

• Displacement: 55 cm³/rev (steplessly variable)

• Nominal Pressure: 350 bar (35 MPa)

• Maximum Pressure: 400 bar (40 MPa)

• Control Type: LRDS - Combined pressure/flow/power control (load sensing + pressure cutoff + power limiter)

• Design: For open circuit hydraulic systems

• Mounting Flange: SAE standard options available

• Rotation Direction: Clockwise / Counter-clockwise (optional)

Core Features:

• Bent-Axis Design: The robust angled shaft and conical piston design ensure high efficiency, excellent starting characteristics, and resilience against shock loads. The drive shaft can withstand radial loads .

• LRDS Power Control: Advanced combined control automatically adjusts pump displacement based on system demand—providing load sensing for flow control, pressure cutoff for system protection, and power limiting to prevent engine overload .

• Wide Control Range: Displacement can be adjusted steplessly from maximum down to zero, offering precise flow matching to reduce energy consumption and heat generation .

• High Power Density: Compact and lightweight construction delivers maximum power output in a minimal installation space, providing an excellent power-to-weight ratio .

• Superior Suction Performance: Optimized port plate design ensures excellent self-priming characteristics even at higher speeds .

• Durability: Compact, robust bearing system engineered for long service life in demanding continuous operation .

• Versatile Mounting: Suitable for both mobile and fixed industrial applications .

Main Applications (Suitable Equipment):
The A7VO55LRDS is widely recognized as the core power unit for concrete machinery and various heavy equipment. It is extensively used in:

1. Concrete Machinery:

• Boom pumps for concrete pump trucks

• Concrete placing booms and line pumps

• Concrete mixing plant hydraulics

2. Construction Machinery:

• Hydraulic systems for excavators and loaders

• Utility equipment requiring precise load-sensing control

3. Industrial Applications:

• Injection molding machines requiring precise pressure and flow control

• Machine tools and industrial presses

4. Specialty Vehicles:

• Mobile cranes and aerial work platforms

• Refuse trucks and municipal vehicles

5. Metallurgy & Heavy Industry:

• Hydraulic power units for steel mills and forging presses

6. Marine & Offshore:

• Hydraulic systems for shipboard equipment