Rexroth A6VM Series Variable Displacement Motor | A6VM107 A6VM200 A6VM80 | Hydraulic Piston Motor

The A6VM Series bent-axis variable displacement motors by Chengyuan Hydraulic are heavy-duty drive components engineered to the rigorous standards of Rexroth Series 63. This range covers high-performance models including the A6VM107HD1 (Hydraulic Control), A6VM200MA (Mechanical Control), and A6VM80EZ4 (Electric Two-point Control).

As a core actuator for open or closed-loop hydrostatic drives, Chengyuan ensures that the displacement range, torque output, mounting flanges (SAE/ISO), and control logic of the A6VM are 100% original-place interchangeable with the original Rexroth units. Every motor undergoes 100% simulated high-pressure load testing before dispatch to guarantee outstanding starting efficiency and low-speed stability under extreme conditions.

Technical Specifications 

• Compatible Series: Rexroth A6VM Series 63

• Core Model Codes: A6VM80, A6VM107, A6VM200

• Max Displacement ($V_{g max}$): 80 / 107 / 200 $cm^3/rev$

• Min Displacement ($V_{g min}$): Adjustable to 0 $cm^3/rev$

• Rated Pressure: 400 bar (40 MPa)

• Peak Pressure: 450 bar (45 MPa)

• Maximum Speed (at $V_{g max}$): 3350 – 4500 rpm (depending on size)

• Max Torque: Up to 1272 Nm for A6VM200 at 400 bar differential

• Control Types: HD (Hydraulic Direct), MA (Mechanical), EZ (Electric Two-point)

• Seals: FKM (Viton) standard for high temperature and chemical resistance

Key Technical Advantages:

• Optimized Bent-Axis Geometry: Utilizing the classic 40° bent-axis piston layout, providing lower moment of inertia and a wider displacement range compared to swashplate designs. This allows for superior speed ratios and massive gradeability for mobile machinery.

• High Volumetric Efficiency & Starting Torque: Through ultra-precision lapping of the valve plate and cylinder interface, we ensure exceptional sealing. This enables the motor to deliver smooth, powerful torque even at low speeds, with starting efficiency significantly exceeding standard aftermarket options.

• Long-Life Heavy-Duty Bearings: Internal tapered roller bearings are optimized for high-pressure surges. Combined with an integrated forced lubrication circuit, they guarantee high fatigue life and radial load capacity even during continuous peak-pressure operation.

• Precision Control Modules: The HD1 and EZ4 control blocks are finely tuned for rapid response and minimal hysteresis. The anodized aluminum control housings provide enhanced corrosion resistance and long-term sensitivity of the adjustment mechanisms.

Application Areas:

• Mobile Machinery Drives: Excavator travel, crawler drills, and crane winch mechanisms.

• Industrial Transmissions: Heavy-duty conveyors, agitator drives, and paper mill equipment.

• Mining Equipment: High-pressure hydraulic drives for roadheaders and crushers.

Expert Maintenance Tips:

• Case Drain Pressure Control: Ensure the drain line (Port T) is properly connected. Case pressure must not exceed 2 bar (10 bar peak) to prevent shaft seal failure or piston shoe detachment.

• Strict Priming Protocol: Before initial startup or after long downtime, the case must be filled with clean hydraulic oil through the drain port to prevent dry-friction damage to bearings and piston assemblies.

• Viscosity Monitoring: To ensure the longevity of the A6VM, operating oil temperature must be managed to maintain a working viscosity between $16$ and $36 mm^2/s$.