Product Overview
The A6VE80HZ3/63W-VAL020B (Part No. R909610608) and A6VE80EP1/63W-VAL027FHB-S (Part No. R902063717) are variable-displacement, bent-axis axial piston motors from the Bosch Rexroth A6VE Series 63—a high-performance plug-in hydraulic motor family. Featuring an axial tapered piston rotary group of bent-axis design, these motors are specifically engineered for hydrostatic drives in both open and closed circuits.
The hallmark of the A6VE Series 63 is its infinitely variable displacement capability—from Vg max continuously down to Vg min = 0—providing an exceptionally wide control range that enables both high rotational speed and high torque output from a single motor. The plug-in design allows for space-saving installation directly into mechanical gearboxes with minimal mounting complexity.
The A6VE80HZ3/63W-VAL020B features HZ3 hydraulic two-point control, enabling fast switching between two displacement settings.
The A6VE80EP1/63W-VAL027FHB-S features EP1 proportional electric control, providing stepless speed variation via a proportional solenoid valve.
Designed as 100% interchangeable direct replacements for the original Rexroth A6VE Series 63 motors, these products match OEM specifications in mounting dimensions, porting interfaces, and performance characteristics. Every unit undergoes 100% simulated duty cycle testing prior to shipment, validating volumetric efficiency, mechanical efficiency, and sealing integrity under actual operating load conditions.
Technical Specifications
A6VE80HZ3/63W-VAL020B
Model: A6VE80HZ3/63W-VAL020B
Part Number: R909610608
Series: 63
Product Type: Bent-axis axial piston variable motor (plug-in)
Geometric Displacement (Vg max): 80 cm³/rev
Nominal Pressure: 400 bar
Peak Pressure: 450 bar
Control Type: HZ3 Hydraulic Two-Point Control
Max Speed: 1500–4450 rpm (depending on displacement setting)
Direction of Rotation: Clockwise (viewed from shaft end, “W” designation)
Seal Material: FKM
Weight: Approx. 34 kg
Circuit Type: Open circuit / Closed circuit
Displacement Range: Vg max to 0 (infinitely variable to zero)
A6VE80EP1/63W-VAL027FHB-S
Model: A6VE80EP1/63W-VAL027FHB-S
Part Number: R902063717
Series: 63
Product Type: Bent-axis axial piston variable motor (plug-in)
Geometric Displacement (Vg max): 80 cm³/rev
Nominal Pressure: 400 bar
Peak Pressure: 450 bar
Control Type: EP1 Proportional Electric Control
Max Speed: 1500–4450 rpm (depending on displacement setting)
Direction of Rotation: Clockwise (viewed from shaft end, “W” designation)
Seal Material: FKM
Weight: Approx. 30 kg
Circuit Type: Open circuit / Closed circuit
Displacement Range: Vg max to 0 (infinitely variable to zero)
Note: Pressure and speed parameters may vary across different configurations. Please refer to the corresponding Rexroth technical manual RE 91606 for specific model details.
Key Technical Advantages
1. Bent-Axis Variable Design – High Pressure Rating with High Power Density
The A6VE Series 63 employs a proven bent-axis axial piston architecture, delivering rated pressures of 400 bar and peak pressures of 450 bar. With a compact 80 cc/rev displacement package, it achieves exceptional power density—making it ideal for space-constrained mobile equipment requiring high-pressure and high-torque output.
2. Infinitely Variable Displacement with Exceptionally Wide Control Range
The A6VE Series 63 supports infinitely variable displacement from Vg max down to Vg min = 0, providing an exceptionally wide control range. This enables the motor to flexibly transition between low-speed high-torque and high-speed light-load operation modes, meeting complex and varying operating requirements.
3. HZ3 Hydraulic Two-Point Control / EP1 Proportional Electric Control
The A6VE80HZ3/63W-VAL020B features HZ3 hydraulic two-point control, enabling fast switching between two displacement settings via a hydraulic pilot signal. This control type offers rapid response and high reliability, ideal for applications requiring frequent speed changes.
The A6VE80EP1/63W-VAL027FHB-S features EP1 proportional electric control, providing precise displacement adjustment via a proportional solenoid valve for stepless speed control. Compared to traditional hydraulic control, response frequency and control precision are significantly improved, facilitating integration into heavy machinery CAN bus control systems.
4. 100% Interchangeability – Zero-Modification Drop-In Replacement
Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, these motors achieve 100% interchangeability with original Rexroth A6VE Series 63 units. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.
5. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability
Every motor undergoes 100% simulated duty cycle testing before shipment, validating performance under rated pressure (400 bar), peak pressure (450 bar), and maximum speed conditions—ensuring long-term reliability in demanding mobile applications.
6. Plug-In Design for Compact Integration and Simplified Installation
The A6VE series features a plug-in design with a recessed mounting flange, allowing direct insertion into mechanical gearboxes. This significantly simplifies installation, eliminates complex mounting tolerances, and enables exceptional structural compactness.
7. Robust Bearing System with Extended Service Life
A compact, robust bearing system delivers excellent starting characteristics and extended service life. The drive shaft is capable of accepting radial loads, accommodating various transmission configurations common in mobile machinery.
Application Areas
Construction Equipment: Excavator travel drives, bulldozer travel drives, loader travel drives
Road Machinery: Roller travel drives (Hamm rollers, etc.)
Mining Equipment: Underground LHDs, mining auxiliary equipment
Hoisting & Transport: Truck cranes, port gantry crane travel drives
Building Machinery: Grader travel drives
Agricultural Machinery: Large combine harvester travel drives
Expert Maintenance Tips
Pre-Installation Preparation: Before using the A6VE series motor, read and understand the complete Rexroth instruction manual (RE 91606). For first commissioning, fill the motor housing with hydraulic fluid using a filling unit with filtration not less than 10 µm. Never operate the motor without fluid.
Plug-In Installation Notes: The A6VE features a plug-in design—simply push the motor directly into the mechanical gearbox. Ensure the gearbox mounting bore is clean and free of contaminants before installation to prevent seal damage.
Oil Cleanliness Control: A6VE series motors require high fluid cleanliness. Recommended system filtration not less than ISO 4406 18/13. Regular oil analysis is recommended with filter change intervals adjusted based on contamination levels.
Electric Proportional Control Tuning (EP1 model): EP1 electric proportional control requires a minimum pilot pressure of 30 bar. During commissioning, set the solenoid current-pressure characteristic curve according to RE 91606 technical manual specifications.
Hydraulic Pilot Control Tuning (HZ3 model): HZ3 hydraulic two-point control requires clean and stable pilot pressure oil. Ensure pilot pressure remains within the specified switching pressure range during operation.
Case Drain Pressure Monitoring: Regularly monitor case drain pressure to ensure it remains within design limits, preventing excessive housing pressure that could damage shaft seals.
Regular Inspection Schedule: Regular inspection of the hydraulic system and axial piston unit is recommended. Check hydraulic fluid level daily and monitor operating temperature, noise levels, and case drain flow regularly. Abnormal increases may indicate internal wear or seal degradation.
