A2FO180 A2FO180/61R-PAB05 Piston Pump | 400 bar | Rexroth

Product Overview

The A2FO series bent-axis axial piston fixed displacement pumps represent a core product line within the Bosch Rexroth hydraulic transmission platform, featuring the proven bent-axis axial tapered piston rotary group design, specifically engineered for open-circuit hydraulic systems. The series offers a comprehensive displacement range from 5 to 1,000 cm³/rev, addressing applications from micro-hydraulic systems to large-scale industrial installations. This product covers the A2FO180 model, with the following specific configurations:

• A2FO180/61R-PAB05 (Material No. 9409371)

• A2FO180/61R-PBB05 (Material No. 9409358)

Design Positioning: The A2FO series consists of fixed displacement pumps — flow rate is directly proportional to drive speed and displacement, with no displacement adjustment capability. Compared to variable pumps, fixed displacement pumps offer simpler construction, higher reliability, and lower cost — ideal for applications requiring constant flow without flow regulation. The series features one-piece tapered pistons with piston ring sealing, delivering exceptional volumetric efficiency and sealing performance under high-pressure conditions.

100% Interchangeability Guarantee: Our pumps strictly adhere to Bosch Rexroth A2FO Series 61 original mounting dimensions and port layouts, utilizing ISO standard 4-bolt mounting flanges, enabling drop-in replacement without modifications. Every unit undergoes 100% simulated duty-cycle testing under actual load conditions to validate performance parameters before shipment, ensuring immediate reliability upon installation.

Quality & Manufacturing Standards: The housing is manufactured from high-strength cast iron, with critical tribological pairs precision-ground and heat-treated. One-piece tapered pistons with piston ring seals ensure excellent volumetric efficiency under high pressure. Drive shaft bearings are designed to meet conventional service life requirements in industrial applications. All products strictly adhere to Bosch Rexroth original quality standards.

Technical Specifications 

Series General Specifications (A2FO Series 61):

• Design: Bent-axis axial tapered piston fixed displacement pump

• Circuit Type: Open circuit

• Displacement Range: 5 – 1,000 cm³/rev

• Rated Pressure (Sizes 10–200): 400 bar (40 MPa)

• Peak Pressure (Sizes 10–200): 450 bar (45 MPa)

• Rated Pressure (Size 5): 315 bar

• Peak Pressure (Size 5): 350 bar

• Rated Pressure (Sizes 250–1000): 350 bar

• Peak Pressure (Sizes 250–1000): 400 bar

• Flow Characteristic: Proportional to drive speed and displacement

• Mounting Flange: ISO standard 4-bolt flange

• Hydraulic Fluid: Mineral oil and approved hydraulic fluids

• Temperature Range: 30–90°C

A2FO180/61R-PAB05 (Material No. 9409371):

• Series: A2FO

• Size: 180

• Series Designation: 61

• Rotation: R (clockwise, viewed from shaft end)

• Displacement (Vg): 180.0 cm³/rev

• Rated Pressure: 400 bar

• Peak Pressure: 450 bar

• Maximum Speed: 1,450 rpm

• Theoretical Flow (@ 1,450 rpm): 261 L/min

• Mounting Flange: ISO standard 4-bolt flange

• Weight: Approx. 53 kg

A2FO180/61R-PBB05 (Material No. 9409358):

• Series: A2FO

• Size: 180

• Series Designation: 61

• Rotation: R (clockwise, viewed from shaft end)

• Displacement (Vg): 180.0 cm³/rev

• Rated Pressure: 400 bar

• Peak Pressure: 450 bar

• Maximum Speed: 1,450 rpm

• Theoretical Flow (@ 1,450 rpm): 261 L/min

• Mounting Flange: ISO standard 4-bolt flange

• Weight: Approx. 53 kg

Key Technical Advantages

1. Bent-Axis Design — Exceptional Power Density and High Efficiency
The A2FO series features bent-axis axial tapered piston rotary group design, with the drive shaft axis at an angle to the cylinder barrel axis. Compared to swashplate designs, the bent-axis configuration delivers higher power density, smaller installation footprint, and superior overall efficiency. Drive shaft bearings are designed to meet conventional service life requirements in industrial applications.

2. One-Piece Tapered Pistons with Piston Rings — Excellent Volumetric Efficiency Under High Pressure
The A2FO series features one-piece tapered pistons with piston ring sealing. This design provides superior sealing performance and volumetric efficiency under high-pressure conditions, effectively minimizing internal leakage and ensuring sustained high-efficiency operation at 400 bar rated pressure.

3. 400 bar Rated / 450 bar Peak — High-Pressure Benchmark in Open Circuits
The A2FO180 series delivers 400 bar (40 MPa) rated pressure and 450 bar (45 MPa) peak pressure in the Series 61 configuration. This pressure rating enables the A2FO180 series to handle everything from construction machinery to industrial equipment — one of the highest-pressure fixed displacement pumps in open-circuit applications.

4. Compact Design and High Reliability
The A2FO series delivers exceptional power density within a compact envelope. High-strength cast iron housing and precision-machined critical tribological pairs ensure long-term reliability under high-pressure, heavy-load conditions. The simple construction of fixed displacement pumps with fewer failure points offers significant advantages in continuous operation scenarios demanding high reliability.

5. Flow Proportional to Speed — Predictable Constant Output
As a fixed displacement pump, the A2FO series delivers output flow strictly proportional to drive speed and displacement. This characteristic enables system designers to precisely predict pump output flow, simplifying system design and commissioning — particularly advantageous for applications demanding flow stability.

Application Areas

The A2FO series bent-axis axial piston fixed displacement pumps are widely deployed in open-circuit hydraulic systems across the following applications:

• Construction Machinery — hydraulic systems for excavators, large loaders, cranes

• Mining Equipment — hydraulic drive systems for underground loaders and haulers

• Agricultural Machinery — hydraulic systems for large tractors

• Material Handling Equipment — hydraulic systems for heavy forklifts and reach stackers

• Industrial Hydraulic Systems — hydraulic power units, test benches, presses

• Marine Hydraulic Systems — deck machinery, hatch cover systems

• Metallurgical Equipment — mill hydraulic systems, coilers

Expert Maintenance Tips

1. Installation and Alignment Requirements (Critical Step)
A2FO series pumps should be installed horizontally (pump shaft oriented horizontally). Flexible couplings must be used to connect the pump shaft to the drive shaft to prevent radial or axial loads from being transmitted to the pump shaft. Concentricity deviation between the drive shaft and pump shaft must not exceed 0.05 mm. The pump mounting base must provide sufficient rigidity.

2. Suction Conditions and Housing Priming
Before initial start-up or after extended downtime, the housing must always be filled with hydraulic fluid. Pre-fill through case drain ports prior to start-up to prevent dry-running damage to critical tribological pairs. The suction line must be free from leaks and blockages, with oil viscosity within the recommended range.

3. Filtration and Fluid Cleanliness
Axial piston pumps are highly sensitive to fluid cleanliness. Recommended filtration per ISO 4406 cleanliness level of 19/17/14 or better. Approved hydraulic fluids include mineral oil and approved hydraulic fluids, with an operating temperature range of 30–90°C. Return line and suction filters should be inspected and replaced regularly.

4. Initial Start-Up and Break-In
For first-time operation, run the pump at low speed (idle) with no load for 5–10 minutes to purge air from the system and allow proper oil film establishment on all tribological pairs before gradually applying load.

5. Model Code Interpretation
The A2FO series model code contains extensive product information: 【A2FO】indicates bent-axis fixed displacement axial piston pump; 【180】indicates 180 cm³ displacement; 【61】indicates Series 61; 【R】indicates clockwise rotation; 【PAB05/PBB05】indicates specific sealing, drive shaft, mounting flange, and working port configurations. Material No. 9409371 corresponds to the PAB05 configuration, and 9409358 corresponds to the PBB05 configuration.