Rexroth AA2FM32 Hydraulic Motor | AA2FM32/61W-VSD540 | High Pressure Bent Axis Piston Motor

The AA2FM32 Series high-pressure bent axis fixed displacement motors from Chengyuan Hydraulic are premium drive units fully compatible with Rexroth Series 61 standards. Featuring the classic 40° bent axis geometry, these motors offer high power density, exceptional startup torque, and high-speed efficiency. For the core model AA2FM32/61W-VSD540, we have optimized the wear-resistant coating on the pistons and synchronization hinges. Every motor undergoes 100% simulated full-load condition testing to verify that volumetric efficiency and mechanical response at high pressures (400 bar) match OEM benchmarks, ensuring 100% original-place interchangeability.

Technical Specifications :

• Series Model: AA2FM (SAE version of the standard A2FM)

• Nominal Size: 32 (Displacement 32.2 cm³/rev)

• Design Series: Series 61 (61W)

• Nominal Pressure: 400 bar (40 MPa)

• Peak Pressure: 450 bar (45 MPa)

• Max Speed (n_max): 5000 rpm (Continuous) / 6300 rpm (Intermittent)

• Output Torque (at Δp = 400 bar): 205 Nm

• Sealing: V (Viton/FKM for high temperature resistance)

• Shaft Ends: S (SAE Splined) / D (Parallel Keyed)

• Port Configuration: D540 (Side or rear ports, SAE compliant)

• Rotation: Bi-directional (CW/CCW)

Key Technical Advantages:

• 40° Bent Axis Efficiency: The AA2FM32 utilizes a bent axis design where piston loads are transmitted via the synchronization hinges rather than slippers on a swashplate. This significantly reduces frictional losses at high speeds and provides better cold-start performance and contaminant tolerance.

• Spherical Valve Plate Sealing: The contact interface between the valve plate and the cylinder block features a spherical design. This “self-centering” mechanism ensures a tight seal under high-pressure pulses, maintaining volumetric efficiency above 96%.

• High-Load Bearing System: Engineered for industrial drives and mobile machinery, we have reinforced the main shaft bearings. The enlarged tapered roller bearings can handle significant radial loads, allowing for direct gear or pulley mounting on the output shaft.

• 100% Dynamic Performance Validation: Chengyuan uses digital test benches to conduct step-load tests on every AA2FM32. By monitoring leakage with precision flow meters, we ensure the VSD540 series motors perform reliably across the entire pressure range.

Application Areas:

• Mobile Machinery: Swing drives for excavators and drive motors for compact road-building equipment.

• Industrial Equipment: Mixer drives and fan drive systems (cooling circuits).

• Construction Machinery: Agitator motors for concrete pumps and rotary head drives for drilling rigs.

Expert Maintenance Tips:

• Mandatory Case Priming: Internal components of bent axis motors rely on lubrication within the housing. Before initial startup or after long-term storage, the housing must be filled with clean hydraulic oil through the highest drain port (Port T).

• Drain Pressure Limits: Ensure the case drain backpressure does not consistently exceed 2 bar (peak 10 bar). Excessive backpressure will damage the shaft Viton seal, leading to external leakage.

• Filtration Standards: To extend the life of the synchronization hinges, maintain oil cleanliness at ISO 4406 18/16/13 or better, with filtration no coarser than 10μm.