Product Overview
The A6VM200EP2D/63W-VAB020HB (Part No. R902067710) is a bent-axis axial piston variable motor from the Bosch Rexroth A6VM Series 63. Featuring a proven bent-axis design with an axial tapered piston rotary group, this motor delivers infinitely variable displacement down to zero and is engineered for hydrostatic drives in both open and closed circuits.
The A6VM Series 63 is Rexroth’s classic bent-axis variable motor line, covering sizes from 28 to 1000 cc/rev. The A6VM200, as a large-frame model in the series, delivers 200 cc/rev maximum displacement. A6VM Series 63 sizes 28 through 200 are rated at 400 bar nominal pressure with 450 bar peak pressure.
This model features EP2D proportional electric control, enabling precise displacement adjustment via proportional solenoids for stepless speed control. Compared to traditional hydraulically piloted controls, EP series electric proportional controls offer superior response frequency and control precision, facilitating seamless integration into heavy machinery CAN bus control systems. The EP2D features dual-channel proportional control, providing redundant control capability.
Designed as a 100% interchangeable direct replacement for the original Rexroth A6VM200EP2D/63W-VAB020HB, this product matches 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
Model: A6VM200EP2D/63W-VAB020HB
Part Number: R902067710
Brand: Bosch Rexroth
Series: 63
Product Type: Bent-axis axial piston variable motor
Max Geometric Displacement (Vg max): 200 cc/rev
Nominal Pressure: 400 bar
Peak Pressure: 450 bar
Max Speed (at Vg max): Approx. 1800–2100 rpm (typical for size 200)
Nominal Torque (at Δp = 400 bar): Approx. 1273 N.m (based on 200 cc displacement)
Theoretical Torque Coefficient: 3.18 N.m/bar
Control Type: EP2D Proportional Electric Control (dual-channel proportional solenoids)
Direction of Rotation: Clockwise (viewed from shaft end, “W” designation)
Port Configuration: VAB020HB (SAE flange ports, “B” indicates standard configuration)
Weight: Approx. 78–80 kg
Circuit Type: Open circuit / Closed circuit
Hydraulic Fluids: Mineral oil HLP (DIN 51524)
Operating Oil Temperature: -25°C to +115°C (FKM seals)
Note: The above specifications are compiled based on A6VM Series 63 general technical data. Specific parameters may vary across different configurations (control type, shaft type, seals, etc.). Please refer to the official Rexroth technical manual RE 91604 for exact specifications.
Key Technical Advantages
1. Bent-Axis Variable Design with Ultra-High Pressure Rating and Power Density
The A6VM Series 63 employs a proven bent-axis axial piston architecture, delivering nominal pressure up to 400 bar and peak pressure up to 450 bar. With a compact 200 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. EP2D Dual-Channel Proportional Electric Control for Precise Stepless Speed Regulation
EP2D proportional electric control adjusts the swashplate angle via dual-channel proportional solenoids, enabling stepless displacement control. Compared to traditional hydraulically piloted controls, response frequency and control precision are significantly improved, facilitating seamless integration into heavy machinery CAN bus control systems. The dual-channel design provides redundant control capability, enhancing system reliability.
3. Infinitely Variable Displacement to Zero with Exceptionally Wide Control Range
The A6VM 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.
4. 100% Interchangeability – Zero-Modification Drop-In Replacement
Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, this motor achieves 100% interchangeability with the original Rexroth A6VM200EP2D/63W-VAB020HB. 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) and peak pressure (450 bar) conditions—ensuring long-term reliability in demanding rotary drilling rig, construction, and mobile applications.
6. Bent-Axis Tapered Piston Design for High Efficiency and Extended Service Life
The A6VM series employs a proven bent-axis design with an axially tapered piston rotary group that optimizes internal flow dynamics, delivering exceptional volumetric and mechanical efficiency. The piston rotary group features hydrostatic bearings, significantly extending service life.
7. Modular Configuration for Versatile Application Adaptation
The A6VM Series 63 offers multiple control options (EP electric proportional, HP hydraulic proportional, HZ two-point, HA automatic high-pressure control, DA automatic speed-related control, etc.). Optional flushing valves, boost-pressure valves, counterbalance valves (BVD/BVE), and speed sensors are available. Size 200 is rated at 400 bar nominal pressure and 450 bar peak pressure.
Application Areas
Rotary Drilling Rigs: Power head drives
Construction Equipment: Excavator travel drives, crawler crane travel drives
Hoisting Machinery: Deck crane hoist drives
Mining Equipment: Underground LHD travel drives, mining auxiliary equipment
Concrete Machinery: Concrete pump truck pumping drives
Marine Engineering: Drilling platform winch drives, marine deck machinery
Specialty Vehicles: Airport ground support equipment, fire ladder truck hydraulic systems
Expert Maintenance Tips
Pre-Installation Preparation: Before using the A6VM series motor, read and understand the complete Rexroth instruction manual (RE 91604). For first commissioning, fill the motor housing with hydraulic fluid using a filling unit with filtration not less than 10 µm and bleed air completely—never operate the motor without fluid.
Electric Proportional Control Tuning: EP2D electric proportional control requires a minimum pilot pressure of 30 bar. During commissioning, set the solenoid current-pressure characteristic curve according to RE 91604 technical manual specifications, ensuring parameter matching between the dual-channel proportional solenoids.
Case Drain Port Orientation: Ensure the case drain port is positioned at the highest point during installation to guarantee proper lubrication and air bleeding. The drain line must return to a separate oil tank with backpressure within allowable limits.
Oil Cleanliness Control: A6VM series motors require high fluid cleanliness. Mineral oil HLP according to DIN 51524 is recommended. Recommended system filtration not less than ISO 4406 18/13. Regular oil analysis is recommended with filter change intervals adjusted based on contamination levels.
Optional Valve Maintenance (if equipped): For models equipped with flushing and boost pressure valves, regularly inspect the flushing valve’s cracking pressure and flow rate to ensure adequate oil cooling and filtration in the circuit.
Coupling Alignment: Precise alignment between the motor shaft and drive shaft is required with minimal tolerance. After installation, manually rotate the coupling to verify smooth operation.
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.
