A2FO32/61L-VAB05 Rexroth Axial Piston Pump 32cc 400bar

Product Overview

The A2FO32/61L-VAB05 is a fixed-displacement, bent-axis axial piston pump from the Bosch Rexroth A2FO series, engineered for hydrostatic drives in open-circuit hydraulic systems. With a geometric displacement of 32 cm³/rev, this pump delivers flow proportional to drive speed and displacement, utilizing a proven bent-axis design where tapered pistons are arranged diagonally to the drive shaft.

Designed as a 100% interchangeable direct replacement for the original Rexroth A2FO32/61L-VAB05, this product matches OEM specifications in mounting dimensions, porting interfaces, and performance characteristics. Every unit undergoes 100% simulated duty cycle testing prior to shipment, validating volumetric efficiency, mechanical efficiency, and sealing integrity under actual operating load conditions.

The A2FO series is one of Rexroth’s most widely applied fixed pump product lines, recognized for its high power density and exceptional reliability across concrete pump truck boom systems, mobile machinery drives, and industrial hydraulic applications.

Technical Specifications 

• Model: A2FO32/61L-VAB05

• Series: 61 (Heavy-duty design)

• Product Type: Bent-axis axial piston fixed pump (open circuit)

• Geometric Displacement: 32 cm³/rev

• Nominal Pressure: Up to 400 bar (5800 psi)

• Peak Pressure: Up to 450 bar (6527 psi)

• Max Input Speed: 3200 rpm

• Rated Speed: 3150 rpm

• Max Flow Rate: 102.4 L/min (at 3200 rpm)

• Direction of Rotation: Counterclockwise (viewed from shaft end, “L” designation)

• Port Configuration: VAB05 (Standard SAE flange, rear inlet/outlet)

• Shaft Type: Cylindrical shaft with keyway (DIN 6885)

• Mounting Flange: 4-hole ISO 3019-2 flange

• Seal Material: FKM (Viton)

• Weight: Approx. 11 kg

• Protection Class: IP65

• Operating Temperature: -30°C to +80°C

• Hydraulic Fluids: Mineral oil, HLP, HVLP (viscosity 10–600 mm²/s)

Note: Pressure and speed parameters may vary across different models and configurations. Please refer to the corresponding technical manual for specific model details.

Key Technical Advantages

1. Bent-Axis Design for High Efficiency and Low Pulsation
The A2FO series employs a proven bent-axis design with tapered pistons arranged diagonally to the drive shaft. This configuration optimizes internal flow kinetics and fluid port positioning, delivering high volumetric and mechanical efficiency with minimal noise and pulsation.

2. High Power Density – Compact Size with Exceptional Pressure Capability
With a displacement of 32 cm³/rev in a compact footprint, the pump delivers rated pressure up to 400 bar and peak pressure up to 450 bar. This high power density makes it ideal for space-constrained mobile equipment requiring high-pressure output.

3. 100% Interchangeability – Zero-Modification Drop-In Replacement
Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, this pump achieves 100% interchangeability with the original Rexroth A2FO32/61L-VAB05. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.

4. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability
Every pump undergoes 100% simulated duty cycle testing before shipment, validating performance under rated pressure, peak pressure, and maximum speed conditions—ensuring long-term reliability in demanding mobile and industrial applications.

5. One-Piece Tapered Pistons with Integrated Piston Rings for Superior Sealing
The design incorporates one-piece tapered pistons with integral piston rings, providing excellent sealing performance that minimizes internal leakage and maximizes overall system efficiency.

6. Heavy-Duty Roller Bearings for Long Service Life and High Radial Load Capacity
Built with heavy-duty roller bearings capable of withstanding high radial loads and axial shocks, the pump is designed for 20,000+ hours of continuous operation under rated conditions.

7. Precision Machining and High-Quality Materials for Harsh Environments
Critical friction pairs are manufactured with precision grinding processes, complemented by high-strength cast iron and hardened steel components that resist extreme shock, vibration, and contamination.

Application Areas

• Concrete Pump Trucks: Boom pump systems, boom cylinder and outrigger drives

• Excavators: Main hydraulic supply, boom/bucket control

• Loaders & Dozers: Lift/tilt hydraulic systems

• Mobile Cranes: Telescopic boom and stabilizer leg hydraulics

• Pavers & Asphalt Equipment: Propulsion and control systems

• Aerial Work Platforms: Platform lift/lower hydraulic power supply

Expert Maintenance Tips

1. Pre-Installation Preparation: Before using the axial piston unit, read and understand the complete instruction manual. For first commissioning, fill the pump housing with hydraulic fluid using a filling unit (10 µm filter grade). Never operate the pump without fluid.

2. Minimum Suction Pressure: Ensure a minimum suction pressure of 0.8 bar absolute is present at port “S”. Keep the suction line unobstructed to prevent cavitation damage.

3. Case Drain Port: When installing, ensure the case drain port is positioned at the highest point to guarantee proper lubrication and air bleeding.

4. Coupling Alignment: Precise alignment between the pump shaft and drive shaft is required with minimal tolerance. After installation, manually rotate the coupling to verify smooth operation.

5. Oil Cleanliness Control: A2FO series pumps require high fluid cleanliness. Recommended system filtration not less than ISO 4406 18/16/13 to maximize pump service life.

6. Seal Maintenance: Use OEM-specification FKM (Viton) seals to ensure sealing performance and service life under high-temperature conditions.

7. Regular Inspection: Periodically monitor pump body temperature, noise level, and case drain flow. Abnormal increases may indicate internal wear or seal degradation.