Product Overview
The A2FE56/61W-VZL100 (Material No. R902160774) is a core model within the 56 frame size of Bosch Rexroth’s A2FE Series of bent axis axial piston plug-in fixed displacement motors, built on the Series 61 (high-pressure version) platform. The A2FE Series is a plug-in version fixed motor with axial tapered piston rotary group of bent-axis design, developed for hydrostatic drives in open and closed circuits, suitable for both mobile and stationary applications.
The A2FE56/61W-VZL100 has a nominal displacement of 56.1 cm³/rev, with a nominal working pressure of up to 400 bar (5800 psi) and maximum pressure of 450 bar (6527 psi). At the rated speed of 5000 rpm, maximum input flow is 281 L/min; at 400 bar pressure differential, theoretical output torque is approximately 357 N·m.The motor features a recessed mounting flange located in the center of the case, allowing far-reaching integration into mechanical gearboxes for an extremely space-saving construction. Installation is straightforward — simply slide the motor into the mechanical gearbox — with no configuration specifications to be observed when installing.
Model code breakdown: A2FE = bent axis axial piston plug-in fixed displacement motor; 56 = nominal displacement 56.1 cm³/rev; 61 = Series 61 (high-pressure version); W = bidirectional rotation (viewed on drive shaft); V = FKM (fluoroelastomer) seals; Z = special shaft end configuration; L = special mounting flange configuration; 100 = port configuration code.
The motor features one-piece tapered pistons with drive shaft bearings designed for the long-life requirements of mobile and industrial applications. Optional features include integrated pressure relief valve for overpressure protection, and mounted additional valves such as counterbalance valve (BVD/BVE), flushing and boost-pressure valve for added control and safety.As a drop-in replacement, the motor is fully compatible with the OEM Rexroth specification in mounting interface, shaft end configuration, and performance characteristics, enabling direct replacement without hydraulic circuit or mounting bracket modification. Every unit undergoes 100% simulation-based testing prior to shipment, covering displacement calibration, torque output, pressure holding, and internal leakage.
Technical Specifications
All parameters below are based on Bosch Rexroth official technical documentation and verified supplier technical pages:
Complete Model: A2FE56/61W-VZL100
Material Number (MNR): R902160774
Brand: Bosch Rexroth
Product Series: A2FE series, Series 61 (high-pressure version)
Product Type: Bent axis axial piston plug-in fixed displacement motor
Nominal Displacement: 56.1 cm³/rev
Nominal Working Pressure: 400 bar (5800 psi)
Maximum Pressure: 450 bar (6527 psi)
Rated Speed: 5000 rpm
Maximum Speed: 5500 rpm
Maximum Input Flow: 281 L/min (at rated condition)
Theoretical Torque (@ Δp = 350 bar): 313 N·m
Theoretical Torque (@ Δp = 400 bar): 357 N·m
Drive Type: 40° bent-axis design, one-piece tapered pistons
Mounting: Plug-in type, recessed mounting flange located in center of case
Drive Shaft: Special shaft end configuration (Z code)
Port Connection: Special port configuration (100 code)
Direction of Rotation: Bidirectional (W, viewed on drive shaft)
Seal Material: FKM (fluoroelastomer)
Hydraulic Fluid: Mineral oil per DIN 51524 / ISO 11158
Case Drain: Routed via highest drain port to reservoir; case pressure must not exceed 0.2 MPa (2 bar)
Weight: Approx. 18 kg
Mounting Position: Any position, integrated into mechanical gearbox
A2FE Series Other Model Specifications Reference (Series 61):
A2FE28: Displacement 28.1 cm³/rev, rated speed 6300 rpm, torque @400 bar 179 N·m, weight 10.5 kg
A2FE32: Displacement 32.0 cm³/rev, rated speed 6300 rpm, torque @400 bar 204 N·m, weight 10.5 kg
A2FE45: Displacement 45.6 cm³/rev, rated speed 5600 rpm, torque @400 bar 290 N·m, weight 15 kg
A2FE56: Displacement 56.1 cm³/rev, rated speed 5000 rpm, torque @400 bar 357 N·m, weight 18 kg
A2FE63: Displacement 63.0 cm³/rev, rated speed 5000 rpm, torque @400 bar 401 N·m, weight 19 kg
A2FE80: Displacement 80.4 cm³/rev, rated speed 4500 rpm, torque @400 bar 512 N·m, weight 23 kg
A2FE90: Displacement 90.0 cm³/rev, rated speed 4500 rpm, torque @400 bar 573 N·m, weight 25 kg
A2FE107: Displacement 106.7 cm³/rev, rated speed 4000 rpm, torque @400 bar 679 N·m, weight 34 kg
A2FE125: Displacement 125.0 cm³/rev, rated speed 4000 rpm, torque @400 bar 796 N·m, weight 36 kg
A2FE160: Displacement 160.4 cm³/rev, rated speed 3600 rpm, torque @400 bar 1021 N·m, weight 47 kg
A2FE180: Displacement 180.0 cm³/rev, rated speed 3600 rpm, torque @400 bar 1146 N·m, weight 48 kg
A2FE250: Displacement 250.0 cm³/rev, rated speed 2700 rpm
A2FE355: Displacement 355.0 cm³/rev, rated speed 2240 rpm
Note: Specifications are based on Bosch Rexroth official technical documentation and verified supplier technical pages (Kamchau, Proftech Engineering, Buyrexroth, Xeriwell, etc.). The A2FE Series covers a complete product matrix with displacements from 28.1 to 355 cm³/rev. Always verify against the complete model code and consult the latest Rexroth official technical documentation during selection.
Key Technical Advantages
1. Plug-In Design with Recessed Flange for Extremely Compact Integration
The A2FE56 features a unique plug-in design with a recessed mounting flange located in the center of the case, enabling far-reaching integration into mechanical gearboxes with an extremely space-saving construction.Installation simply requires sliding the motor into the mechanical gearbox, with no configuration specifications to be observed, greatly simplifying the assembly process and system integration for equipment manufacturers. This design is particularly suited to track drives, winch mechanisms, and other applications with demanding space constraints.
2. 40° Bent-Axis Design for High Power Density and High Starting Efficiency
The A2FE56 employs a proven 40° bent-axis design, where pistons act directly on the drive shaft flange through a tapered configuration to generate torque. This design enables high power density and very high total efficiency within a compact size.The bent-axis architecture delivers high torque at startup, offering excellent starting efficiency, particularly suitable for travel drive applications requiring frequent start-stop or loaded starting.
3. One-Piece Tapered Pistons for Efficient Sealing and Long Life
The motor’s pistons employ a one-piece tapered structure, effectively reducing internal leakage and improving volumetric efficiency. The one-piece construction reduces the number of moving parts, lowering wear risk. Drive shaft bearings are designed for the long-life requirements of mobile and industrial applications, capable of withstanding substantial radial and axial loads, adapting to direct drive and other mounting configurations.
4. High Pressure Rating with Wide Media Compatibility
With a nominal pressure of 400 bar and maximum pressure of 450 bar, the motor handles high-pressure heavy-duty applications.FKM (fluoroelastomer) seal material provides excellent high-temperature and chemical resistance, with compatibility for mineral oil and HFD hydraulic fluids (selected sizes), meeting diverse industrial environment media requirements.
5. Optional Integrated Valve Modules with 100% Simulation-Based Testing
The motor offers optional integrated pressure relief valve for overpressure protection, as well as mounted additional valves such as counterbalance valve (BVD/BVE), flushing and boost-pressure valve for added control and safety features tailored to specific operational requirements.Every A2FE56/61W-VZL100 undergoes 100% simulation-based testing prior to shipment, covering displacement calibration, torque output verification, pressure holding performance, and internal leakage detection. As a drop-in replacement, the motor is fully compatible with the OEM Rexroth specification in mounting dimensions, shaft end configuration, and performance characteristics, enabling direct replacement of the original unit.
Application Areas
Crawler Excavator Travel Drives: Integrated into travel gearboxes, providing high-pressure high-torque hydraulic power for track drives — one of the most typical A2FE56 applications
Rotary Drilling Rig Power Head Drives: Integrated into gearboxes, providing high-power-density hydraulic drive
Coal Mining Roadheader Travel Drives: Reliable hydraulic drive power under demanding underground conditions
Cranes & Winch Mechanisms: Paired with gearboxes for winch motor applications, utilizing plug-in design for compact layouts
Wheeled or Crawler Transmission Vehicles: Travel drive systems for wheel loaders, bulldozers, and other mobile equipment
Piling Machinery Slewing Drives: Integrated into GFB series slewing gearboxes for piling equipment slewing drives
Mining & Tunneling Equipment: Hydraulic drive systems for roadheaders, roof bolters, and related equipment
Stationary Industrial Hydraulic Systems: Metallurgical equipment, presses requiring high-pressure fixed displacement drives
Expert Maintenance Tips
Pre-Installation Checks:
Verify mounting flange (recessed plug-in flange) matches gearbox mounting interface dimensions; ensure surface is clean and free of burrs
Inspect drive shaft and gearbox input shaft mating surfaces for wear or corrosion; apply appropriate grease
The motor must be fully filled with clean hydraulic oil via the case drain port prior to installation to prevent dry friction damage to piston/cylinder and bearings during startup
Confirm port seals are intact; tighten diagonally to specified torque
Operational Maintenance:
Maintain hydraulic oil cleanliness to ISO 4406 18/16/13 or better; use pressure filters with ≤ 10 μm filtration accuracy
Recommended fluid: mineral oil-based anti-wear hydraulic oil per DIN 51524 / ISO 11158
Periodically monitor hydraulic oil moisture and particle contamination levels; oil replacement recommended every 1,000 to 3,000 operating hours or every six months
The case drain line must run independently and directly to the hydraulic reservoir, routed via the highest drain port on the case; case pressure must not exceed 0.2 MPa (2 bar); connecting in series with the system main return line is strictly prohibited
Periodically inspect shaft seals for aging or leakage; shaft seals recommended for replacement every 5,000 hours
Periodically monitor motor operating temperature and noise level; abnormal increase may indicate internal wear or fluid contamination
Troubleshooting Guide:
Motor fails to rotate or speed abnormal: Check hydraulic system supply pressure; verify directional valve operation; check oil cleanliness
Insufficient output torque: Confirm system pressure reaches rated value (400 bar continuous / 450 bar peak); inspect pistons and cylinder bores for wear
Abnormal noise or vibration: Check case oil fill level; verify suction line is unobstructed; check mounting bolt tightness
External leakage: Inspect shaft seal for aging or damage; verify case drain line back pressure is within 0.2 MPa
Excessive oil temperature: Check system for excessive internal leakage; verify cooling system operation
