Rexroth A2FM Series Fixed Displacement Motor Replacement | A2FM23 A2FM28 A2FM32

Genlu Hydraulic proudly introduces our industrial-grade A2FM Series fixed-displacement axial piston motors. Fully engineered to match Rexroth global standards, this series provides a high-performance, seamless drop-in replacement for industrial drive systems and mobile machinery. We specifically highlight our supply capability for precision-tuned units such as the A2FM23/61W-VBB040-S, A2FM28/61W-VBB010D-K, and A2FM32/61W-VBB020.

The A2FM series utilizes a classic bent-axis design, renowned for its elite starting torque, wide speed range, and high mechanical efficiency. Genlu guarantees 100% Drop-in Interchangeability across mounting flanges, splined-shaft specs, port configurations, and performance curves compared to original Rexroth A2FM assemblies. Every motor undergoes 100% full-pressure load and volumetric-efficiency verification on our digital test benches, certifying rugged, consistent performance for your most critical heavy-duty applications.

Technical Specifications 

• Product Series: Rexroth A2FM Series Bent-Axis Axial Piston Motor

• Representative Models: A2FM23/61W, A2FM28/61W, A2FM32/61W

• Displacement Range: 23 cc/rev – 32 cc/rev

• Nominal Operating Pressure: 350 bar (Continuous)

• Peak Transient Pressure: 400 bar

• Max Speed: Up to 5000 – 8000 rpm

• Shaft Style: Involute Splined Shaft (DIN 5480 standard)

• Mounting Style: SAE 2-Bolt Flange

Key Technical Advantages:

• Bent-Axis Design Geometry: The 40-degree cylinder-block inclination minimizes mechanical friction and maximizes starting torque, ensuring smooth, responsive engagement under high-load startups.

• High-Pressure Durability: Critical rotating groups are manufactured from high-performance alloys with precision grinding, ensuring stable volumetric efficiency even under 400 bar peak pressure shocks.

• Compact Integration: Naturally compact and lightweight, the bent-axis design is ideal for space-constrained mobile machinery, simplifying drivetrain architecture and reducing design complexity.

• Wide System Versatility: Designed for optimal dynamic response in both open and closed-loop circuits, making it the perfect choice for drive and swing functions in modern construction equipment.

Application Areas:

• Mobile Drives: Travel drives for mini-excavators, road rollers, and self-propelled agricultural vehicles.

• Industrial Transmissions: Hydraulic winches, conveyor drive assemblies, and mixer motor power units.

• Construction Equipment: Distribution systems for concrete pumps and rotary drilling equipment.

Expert Maintenance Tips:

• Case Drain Routing: The motor case pressure must never exceed 3 bar. Always ensure the case drain line is routed directly to the reservoir without restrictions; backpressure will lead to immediate shaft-seal failure.

• Fluid Cleanliness: A2FM motors are sensitive to particulate contamination. Adhere to ISO 4406 18/16/13 standards and utilize high-accuracy return-line filtration.

• Corrosion Prevention: If equipment will be idle for extended periods, fill the motor housing completely with clean hydraulic fluid to prevent internal oxidation of bearing and piston surfaces.