A2FM10/61W-VBB030 Rexroth Axial Piston Motor 10.3cc 450bar

Product Overview

The A2FM10/61W-VBB030 and A2FM16/61W-VAB030 are fixed-displacement, bent-axis axial piston motors from the Bosch Rexroth A2FM series. Featuring an axial tapered piston rotary group of bent-axis design, these motors are engineered for hydrostatic drives in both open and closed circuits.

The hallmark of the A2FM series fixed motors is their 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 A2FM series is one of the most widely applied fixed motor product lines in mobile and industrial applications.

Designed as 100% interchangeable direct replacements for the original Rexroth A2FM10/61W-VBB030 and A2FM16/61W-VAB030, these products match 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 A2FM series covers a broad displacement range from 5 to 1000 cm³/rev, with sizes 10 through 200 rated at 400 bar nominal pressure and 450 bar peak pressure. The A2FM10 and A2FM16, as the small-displacement models in the series, are particularly well-suited for applications requiring high speed and high power density.

Technical Specifications 

A2FM10/61W-VBB030

• Model: A2FM10/61W-VBB030

• Part Number: R902230002 / R909610656

• Series: 61

• Product Type: Bent-axis axial piston fixed motor

• Geometric Displacement: 10.3 cm³/rev

• Nominal Pressure: 400 bar

• Peak Pressure: 450 bar

• Max Speed: 8800 rpm

• Max Flow: Approx. 82 L/min

• Control Type: Fixed Displacement

• Direction of Rotation: Clockwise (W designation)

• Seal Material: FKM (V designation)

• Shaft Type: Cylindrical with keyway (B designation)

• Mounting Flange: ISO 3019-2 compliant

• Weight: Approx. 5–6.7 kg

• Circuit Type: Open circuit / Closed circuit

A2FM16/61W-VAB030

• Model: A2FM16/61W-VAB030

• Part Number: R902193383 / R992001351

• Series: 61

• Product Type: Bent-axis axial piston fixed motor

• Geometric Displacement: 16 cm³/rev

• Nominal Pressure: 400 bar

• Peak Pressure: 450 bar

• Max Speed: 8000 rpm (rated)

• Control Type: Fixed Displacement

• Direction of Rotation: Counterclockwise (viewed from shaft end, W designation)

• Seal Material: FKM (V designation)

• Shaft Type: Cylindrical with keyway (A designation)

• Mounting Flange: ISO 3019-2 80B4 HW

• Weight: Approx. 5.67–6 kg

• Circuit Type: Open circuit / Closed circuit

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 A2FM 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. Ultra-High Speed Capability for High-Speed Applications

The A2FM10 supports up to 8800 rpm maximum speed, while the A2FM16 supports 8000 rpm rated speed. This exceptional speed capability makes these motors particularly suitable for high-speed output applications such as fan drives, high-speed mixers, and other rotating equipment—representing a core competitive advantage of the small-displacement models in the A2FM series.

3. Compact Lightweight Design with High Power Density

The A2FM10 weighs approximately 5–6.7 kg, and the A2FM16 weighs approximately 5.67–6 kg. Within this remarkably compact package, these motors deliver 400 bar nominal pressure and 450 bar peak pressure output capability. The excellent power-to-weight ratio provides a significant advantage in space-constrained mobile equipment applications.

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

Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, these motors achieve 100% interchangeability with the original Rexroth A2FM10/61W-VBB030 and A2FM16/61W-VAB030. 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. 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. This significantly minimizes internal leakage, improves overall system efficiency, and extends motor service life.

7. Modular Configuration for Versatile Application Adaptation

The A2FM series offers multiple shaft types, seal materials, mounting flanges, and working port options. Optional integrated pressure relief valves, counterbalance valves (BVD/BVE), flushing valves, and boost-pressure valves further enhance system integration flexibility. Sizes 10 through 200 are rated at 400 bar nominal pressure and 450 bar peak pressure.

Application Areas

• Construction Equipment: Skid steers, excavator auxiliary drives, small rollers

• 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 A2FM 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: A2FM 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. For high-speed motors like the A2FM10 and A2FM16, alignment precision is particularly critical.

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 allowable range (recommended 30–90°C) to prevent viscosity reduction and seal degradation from excessive temperatures, or starting difficulties from excessively low temperatures.