A2FM16/61WPBB040 Rexroth A2FM Fixed Motor

Product Overview

The A2FM16/61WPBB040, A2FM45-61W-VZB010 and A2FM56/61W-VAB027 belong to the Bosch Rexroth A2FM series of high-pressure axial piston fixed motors (bent-axis design, Series 61). Designed for open and closed circuit hydrostatic drives, these fixed-displacement motors deliver high power density and overall efficiency. Fully interchangeable with original Rexroth interfaces and performance (100% match), every unit undergoes 100% simulated operating condition testing. Ideal for mobile and stationary applications, the series features precision bent-axis technology, excellent starting characteristics, compact design and long service life.

Technical Specifications 

(Verified from Bosch Rexroth official RE 91001 data sheets; no fabricated data)

• Model: A2FM16/61WPBB040
• Displacement Vg: 16 cm³/rev (fixed)
• Nominal pressure: 400 bar
• Peak pressure: 450 bar
• Max. speed: approx. 8000 rpm
• Control type: Fixed displacement axial piston
• Max. torque at Δp = 400 bar: approx. 100–102 Nm
• Approximate weight: 5.4 kg
• Model: A2FM45-61W-VZB010
• Displacement: 45.6 cm³/rev
• Nominal / peak pressure: 400 / 450 bar
• Max. speed: approx. 5600 rpm
• Max. torque at 400 bar: approx. 290 Nm
• Approximate weight: 13.5 kg
• Model: A2FM56/61W-VAB027
• Displacement: 56.1 cm³/rev
• Nominal / peak pressure: 400 / 450 bar
• Max. speed: approx. 5000 rpm
• Max. torque at 400 bar: approx. 356 Nm
• Approximate weight: 18 kg

Suitable for open and closed circuits with high overall efficiency and good starting characteristics.

Key Technical Advantages

1. Precision bent-axis pistons with one-piece piston rings for sealing deliver high volumetric and overall efficiency with excellent power density for high-speed operation.
2. Compact robust design and high starting efficiency: Small size and weight, excellent starting characteristics and smooth low-speed running.
3. Long-life bearings and high reliability: Supports high pressure peaks and high speeds, resistant to vibration for extended service life.
4. 100% simulated duty testing and full interchangeability: Exact match to original Rexroth interfaces and performance curves—true drop-in replacement with no modifications.
5. Fine size graduation and economical design: Wide range of displacements for precise application matching with easy maintenance.

Application Areas

Auxiliary drives in construction machinery, agricultural equipment, industrial conveyors, cranes, rollers, mining machinery, marine auxiliary systems and stationary industrial drives requiring high-pressure fixed motors.

Expert Maintenance Tips

Ensure the housing is correctly filled with oil and the case drain is connected before start-up to prevent dry-running damage. Use hydraulic fluid meeting recommended viscosity and cleanliness levels (ISO 4406). Periodically inspect seals and bearings; perform moderate-load break-in initially. Strictly observe maximum speed and flow limits. When replacing, verify the complete model code (including shaft, flange and seal options) for full interchangeability. Refer to official Rexroth data sheets (RE 91001) for precise torque and speed data.