Product Overview
The A2FO63/61R-PBB05 is a fixed-displacement, bent-axis axial piston pump from the Bosch Rexroth A2FO series (Part No. R902160640 / R909408552). Featuring an axial tapered piston rotary group of bent-axis design, this pump delivers flow directly proportional to drive speed and displacement, engineered for hydrostatic drives in open-circuit hydraulic systems.
The A2FO series is one of Rexroth’s most widely applied fixed pump product lines, covering nominal sizes from 5 to 1000 cm³/rev. The A2FO63, as a mid-displacement model in the series, is recognized for its high power density and exceptional reliability across mobile and industrial applications.
Designed as a 100% interchangeable direct replacement for the original Rexroth A2FO63/61R-PBB05, 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.
Technical Specifications
Model: A2FO63/61R-PBB05
Part Number: R902160640 / R909408552
Series: 61
Product Type: Bent-axis axial piston fixed pump (open circuit)
Geometric Displacement: 63 cm³/rev
Nominal Pressure: 400 bar
Peak Pressure: 450 bar
Rated Flow: Approx. 126 L/min
Max Speed: 2800 rpm
Direction of Rotation: Clockwise (viewed from shaft end, “R” designation)
Port Configuration: 05 = SAE flange ports (A/B and S side ports)
Shaft Type: B = Cylindrical shaft with keyway DIN 6885
Mounting Flange: B = ISO 3019-2 4-hole flange
Seal Material: P = NBR
Weight: Approx. 18–20 kg
Circuit Type: Open circuit
Hydraulic Fluids: Mineral oil and approved hydraulic fluids
Note: Pressure and speed parameters may vary across different configurations (shaft type, seal, porting, etc.). Please refer to the corresponding Rexroth technical manual for specific model details.
Key Technical Advantages
1. Bent-Axis Fixed Displacement Design – High Efficiency and Reliability
The A2FO series employs a proven bent-axis design with an axial tapered piston rotary group. The fixed displacement design eliminates the complexity of variable mechanisms, providing superior reliability and extended maintenance intervals under extreme operating conditions. One-piece tapered pistons with piston rings deliver excellent sealing performance.
2. High Power Density – Compact Size with Exceptional Pressure Capability
With a displacement of 63 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 applications 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 A2FO63/61R-PBB05. 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 (400 bar), peak pressure (450 bar), and maximum speed conditions—ensuring long-term reliability in demanding mobile and industrial applications.
5. Robust Construction for Long Service Life
Engineered with a robust and compact design, the pump is built for continuous high-pressure operation. High-quality materials and precision machining ensure extended service life under demanding conditions.
6. Modular Configuration for Versatile Application Adaptation
The A2FO series offers multiple displacement sizes, shaft types, seal materials, and mounting flange options. The PPB05 port configuration features standard SAE flange interfaces with side inlet/outlet ports for flexible system plumbing.
Application Areas
Construction Equipment: Excavator auxiliary hydraulic systems, small crawler drill rigs, roller hydraulic power sources
Mobile Machinery: Travel drive pump sources for small construction machinery
Agricultural Machinery: Combine harvester steering hydraulic pumps, implement lift hydraulic pumps
Mining Equipment: Mining and construction machinery hydraulic drives
Material Handling: Forklift hydraulic systems, AGV drives
Marine Hydraulic Systems: Marine deck machinery hydraulic drives
Industrial Hydraulic Systems: Machine clamping hydraulic power units, small die-casting auxiliary oil sources
Expert Maintenance Tips
Mounting Orientation: Priority should be given to horizontal installation with the drain port positioned downward. The drain line must return to a separate oil tank with back pressure < 0.5 bar—do not connect to the main return line.
Pre-Installation Preparation: Before using the A2FO series pump, read and understand the complete Rexroth instruction manual. For first commissioning, fill the pump housing with hydraulic fluid through the case drain port before testing—never operate the pump without fluid.
Suction Line Design: The inlet line should be short and large in diameter, with inlet filter flow ≥ 2× pump rated flow. Strictly prevent air suction and cavitation.
Coupling Connection: Use a flexible coupling for connection—the pump shaft must not bear radial or axial external loads.
Oil Cleanliness Control: A2FO series pumps require high fluid cleanliness. Recommended system filtration not less than ISO 4406 18/13. Regular oil analysis is recommended with filter change intervals adjusted based on contamination levels.
Regular Inspection Schedule: Regular inspection of the hydraulic system and axial piston unit is recommended. Check hydraulic fluid level daily and monitor operating temperature, noise levels, and case drain flow regularly. Abnormal increases may indicate internal wear or seal degradation.
Operating Temperature Control: Ensure the hydraulic system operating oil temperature remains within the recommended range (30–90°C) to prevent viscosity reduction and seal degradation from excessive temperatures.
