Rexroth A6VM Series Variable Piston Motor | A6VM200 A6VM107 A6VM250

The A6VM Series variable displacement bent-axis piston motors by Chengyuan Hydraulic are premium fluid power components engineered for high-performance hydrostatic drives in both open and closed circuits. This series fully benchmarks the Rexroth 63 Series standards, covering robust configurations such as the A6VM200EP2D (Electric Proportional), AA6VM107HD2 (Hydraulic Proportional), and AA6VM250HD2.

The bent-axis design is renowned for its exceptional displacement ratio ($V_{max}/V_{min}$) and high power-to-weight ratio. Chengyuan ensures 100% original-place interchangeability regarding mounting flanges, shaft splines, and port dimensions. Every motor undergoes 100% simulated operational load testing to guarantee peak mechanical efficiency and long-term stability at continuous pressures up to 400 bar.

Technical Specifications :

• Compatible Series: Rexroth A6VM / AA6VM Series 63

• Core Models: A6VM200EP2D, AA6VM107HD2, AA6VM250HD2

• Geometric Displacement: 107 $cm^3/rev$, 200 $cm^3/rev$, 250 $cm^3/rev$

• Nominal Pressure: 400 bar (40 MPa)

• Maximum Peak Pressure: 450 bar (45 MPa)

• Maximum Speed (at $V_{min}$): 3000 – 4000 rpm (depending on displacement size)

• Control Modes:

  • EP: Electric Proportional Control

  • HD: Hydraulic Proportional Control

• Variable Ratio: Supports continuous displacement adjustment from $V_{max}$ to $V_{min}$ (including 0)

• Sealing: Premium FKM (Viton) seals for high temperature and synthetic fluid compatibility

Key Technical Advantages:

• Bent-Axis High Torque Efficiency: The bent-axis rotor architecture allows for a wider swivel angle than swashplate motors. This translates to higher starting torque efficiency and a broader speed range, enabling the motor to adapt to varying load demands without altering input flow.

• Heavy-Duty Bearing Configuration: Engineered for continuous 400 bar operation, the motor features high-capacity tapered roller bearings. This allows the A6VM to withstand significant radial and axial loads, which is critical for longevity in steep climbing or heavy towing applications.

• Precision-Honed Piston-Cylinder Interface: The pistons and cylinder bores are finished via micron-level precision honing. This minimizes internal leakage and ensures consistent, pulse-free torque output even at ultra-low speeds or minimum displacement settings.

• Integrated Control & Flush Modules: Optional integrated flushing and boost valves manage fluid temperatures in closed circuits and protect the motor from cavitation or overspeed shocks. The modular control design allows for easy field conversion between EP and HD control types.

Application Areas:

• Mobile Traction Drives: Travel motors for excavators, crawler cranes, pavers, and road rollers.

• Winch & Hoist Systems: Lifting motors for tower cranes, offshore winches, and drilling rigs.

• Industrial Heavy Drives: Mixing plant drives, shredders, and high-power rotary mechanisms for large machine tools.

Expert Maintenance Tips:

• Case Drain Pressure Limit: The A6VM motor must always be connected to a drain line. Case pressure should never exceed 2 bar; excessive backpressure will lead to premature shaft seal failure or internal damage.

• Pre-Start Priming: Before the initial startup or after a long period of inactivity, the motor case must be filled with clean hydraulic fluid through the drain port. Never operate the motor with a dry case.

• Minimum Displacement Calibration: When adjusting the $V_{min}$ limit screw on EP or HD controllers, consult the technical manual to ensure a minimum lubricating flow. Setting the displacement too low can cause piston seizure due to insufficient lubrication.