Rexroth AA2FM63 Bent Axis Hydraulic Motor for Heavy Duty Excavator and Slew Drive

Product Overview:
The AA2FM63 is a high-performance bent-axis design axial piston motor from the renowned Rexroth A2FM series. Designed for both open and closed circuit hydrostatic drives, this fixed motor delivers exceptional power density, reliable operation, and high efficiency under demanding conditions . With a displacement of 63 cm³/rev and a compact, robust design, it provides consistent torque and speed for a wide range of mobile and industrial applications . This unit is a direct, high-quality replacement solution for original Rexroth equipment.

Technical Specifications:

• Model: AA2FM63

• Type: Bent-axis design, fixed axial piston motor

• Displacement: 63 cm³/rev (geometric, per revolution) 

• Nominal Pressure: 400 bar (continuous operation) 

• Maximum Pressure: 450 bar (peak) 

• Maximum Speed: Up to 5600 rpm (at reduced displacement)

• Flow Rate: Up to 252 L/min (at max speed)

• Design: For open and closed circuit hydrostatic drives 

• Mounting Flange: SAE / ISO 3019-1 standard, with working ports SAE flange or thread options for US market compatibility 

• Weight: Approximately 32 kg 

• Material: Robust cast iron construction with one-piece tapered piston with piston rings for sealing 

• Temperature Range: -20°C to +90°C (continuous operation) 

Core Features:

• Bent-Axis Design: The robust angled shaft and axial tapered piston rotary group ensure high starting efficiency, excellent total efficiency, and resilience against shock loads .

• Fixed Displacement Motor: Output speed is dependent on the flow of the pump and the displacement of the motor, with output torque increasing with the pressure differential between high and low pressure sides .

• High Power Density: Delivers impressive power within small dimensions, providing excellent power-to-weight ratio in a compact design .

• Very High Total Efficiency: Maintains exceptional efficiency even at high starting conditions, minimizing energy loss and reducing operating costs .

• Flexible Installation Options: Available with working ports SAE flange or thread, catering to various market requirements .

• Optional Integrated Valves: Can be equipped with integrated pressure relief valve for overpressure protection, or mounted additional valves such as counterbalance valve (BVD/BVE), flushing and boost-pressure valve for enhanced functionality .

• Finely Graduated Sizes: Wide variety of nominal sizes allows precise adaptation to specific application requirements .

• Durability: Robust bearing system and high-quality cast iron materials ensure long service life in demanding continuous operation. Long-life bearings available for extended service life .

• Versatile Applications: Suitable for use as motor in both open and closed circuits; also suitable for use as pump in closed circuits .

Main Applications (Suitable Equipment):
The AA2FM63 is widely recognized as the specialized fixed motor for machinery requiring consistent, high-torque hydraulic power. It is extensively used in:

1. Construction Machinery:

• Concrete mixers and concrete agitator drives - widely used in concrete mixing applications 

• Concrete pump trucks - auxiliary drives and mixer drums

• Road rollers and compaction equipment

• Crawler excavators - track drives and auxiliary functions

2. Mining & Tunneling Machinery:

• Mining machinery and coal mining equipment - conveyor drives and auxiliary functions 

• Rock drilling rigs and foundation equipment

• Tunnel boring machines (TBM) - auxiliary drives

3. Industrial Machinery:

• Machine tools and industrial drives

• Conveyor systems and material handling equipment

• General industrial hydraulic systems requiring fixed-speed drives

4. Marine & Offshore:

• Marine hydraulic systems - winch drives and deck machinery 

• Offshore equipment and port machinery

5. Agricultural Machinery:

• Harvesters and agricultural equipment

• Agricultural implements with hydraulic drives

6. Specialty Applications:

• Mobile and stationary hydrostatic drives 

• Winch drives and hoisting equipment

• Rotary drilling rigs - auxiliary functions