A2FE180/61W-VAL100 Rexroth Axial Piston Motor 180cc 400bar

Product Overview

The A2FE180/61W-VAL100 is a fixed-displacement, bent-axis axial piston motor from the Bosch Rexroth A2FE series (Part No. R902158626 / R909421394). Featuring an axial tapered piston rotary group of bent-axis design, this plug-in fixed motor is engineered for hydrostatic drives in both open and closed circuits.

The hallmark of the A2FE series fixed motors is its fixed displacement design—output speed is proportional to input flow, and output torque increases with the pressure differential between high and low-pressure sides. With high power density, exceptional total efficiency, and high starting efficiency, the A2FE series is one of the most widely applied fixed motor product lines in mobile and industrial applications.

The A2FE180/61W-VAL100 features a plug-in design with a recessed mounting flange, allowing it to slide directly into mechanical gearboxes for simplified installation. With a displacement of 180 cc/rev, nominal pressure of 400 bar, peak pressure of 450 bar, maximum speed of 3600 rpm, and nominal torque of 1146 N.m, this motor delivers exceptional power density in a compact package. The A2FE series sizes 28 through 180 are rated at 400 bar nominal pressure and 450 bar peak pressure.

Designed as a 100% interchangeable direct replacement for the original Rexroth A2FE180/61W-VAL100, 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: A2FE180/61W-VAL100

• Part Number: R902158626 / R909421394

• Series: 61

• Product Type: Bent-axis axial piston fixed motor (Plug-in)

• Geometric Displacement: 180 cm³/rev

• Nominal Pressure: 400 bar

• Peak Pressure: 450 bar

• Max Speed: 3600 rpm

• Max Flow: Approx. 648 L/min

• Nominal Torque: 1146 N.m

• Relative Torque: 2.9 N.m/bar

• Control Type: Fixed Displacement

• Direction of Rotation: Reversible

• Shaft Type: A = Splined shaft DIN 5480

• Mounting Flange: L = ISO 3019-2 (2-hole)

• Main Ports: 100 = SAE flange ports, facing downward

• Seal Material: V = FKM (Fluorocarbon rubber)

• Weight: Approx. 17 kg

• Circuit Type: Open circuit / Closed circuit

• Recommended Cleanliness: ISO 4406 18/13

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 A2FE 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. Exceptional total efficiency and high starting efficiency ensure excellent performance during both startup and continuous operation.

2. Plug-In Design for Compact Integration and Simplified Installation

The A2FE series features a plug-in design with a recessed mounting flange, allowing direct insertion into mechanical gearboxes without complex mounting tolerances. This significantly simplifies installation, reduces assembly time and cost, and enables exceptional structural compactness—a critical advantage for space-constrained mobile equipment.

3. High Power Density with High Torque Output

With a compact 180 cc/rev displacement package delivering 400 bar nominal pressure, 450 bar peak pressure, and 1146 N.m nominal torque, this motor delivers exceptional power density. This makes it particularly suitable for applications with limited installation space requiring high-pressure and high-torque output.

4. 100% Interchangeability – Zero-Modification Drop-In Replacement

Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, this motor achieves 100% interchangeability with the original Rexroth A2FE180/61W-VAL100. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.

5. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability

Every motor 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.

6. Optional Integrated Valves for Enhanced System Integration Flexibility

The A2FE series supports optional integrated pressure relief valves, counterbalance valves (BVD/BVE), flushing valves, and boost-pressure valves. These additional valve options further enhance system integration flexibility, enabling customized configurations based on specific application requirements.

7. FKM Seals for Wide Temperature Range Capability

Standard FKM (Fluorocarbon rubber) seals provide excellent sealing performance and service life across a wide oil temperature range, ensuring reliable operation under high-temperature conditions.

Application Areas

• Construction Equipment: Excavator auxiliary drives, small roller travel drives, skid steers

• Agricultural Machinery: Combine harvester drives, balers, self-propelled sprayers

• Industrial Equipment: Fan drive systems, mixers, conveyor drives

• Material Handling: Forklift travel drives, AGV drives

• Concrete Machinery: Concrete mixer truck drum drives

• Marine & Port: Deck machinery, winch drives

• Specialty Vehicles: Airport ground support equipment, municipal vehicles

Expert Maintenance Tips

1. Pre-Installation Preparation: Before using the A2FE series motor, read and understand the complete Rexroth instruction manual. For first commissioning, fill the motor housing with hydraulic fluid using a filling unit with filtration not less than 10 µm. Never operate the motor without fluid.

2. Oil Cleanliness Control: A2FE series motors 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.

3. Case Drain Pressure Monitoring: Regularly monitor case drain pressure to ensure it remains within design limits (typically not exceeding 2–3 bar backpressure), preventing excessive housing pressure that could damage shaft seals.

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

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

6. 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.

7. 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.