Rexroth A6VM Series Variable Piston Motor | A6VM107 A6VM200 High Pressure

The A6VM Series variable displacement bent-axis axial piston hydraulic motors manufactured by Chengyuan Hydraulic are premium, heavy-duty fluid power units engineered to fully match global Bosch Rexroth Series 63 and the latest Series 65 design benchmarks. Positioned as the foundational powerhouse for mobile construction machinery crawler tracks, heavy hoist winch drives, and multi-axis industrial rotary configurations, this series utilizes an advanced $40^\circ$ high-angle bent-axis configuration. This design provides an ultra-wide displacement regulation spectrum, running seamlessly from maximum geometric capacity down to zero displacement ($V_{g\min}=0$), to secure an exceptional output speed-to-torque conversion framework under consistent inlet flow rates. The premium portfolio precisely addresses the highly sophisticated, precision-controlled custom code structures: A6VM107HA2T and A6VM200EP6D1P001G/65MWV0S4A210F-0.

• The A6VM107HA2T integrates a mid-range, high-power-density HA2T automatic pressure-related pilot-control module that dynamically scales displacement relative to load variations for energy conservation.

• The A6VM200EP6D1P001G/65MWV0S4A210F-0 represents a Series 65 large-displacement flagship, featuring an electro-proportional variable control valve (EP6D1) paired with pressure-rise override cut-off safety controls, an M-spec reinforced monoblock cast-steel housing, a bimetallic spherical valve plate interface, and a heavy-duty DIN 5480 splined drive shaft.

Every single A6VM variable motor undergoes 100% rigorous digital test-bench mapping for electro-proportional/hydraulic control response times, hysteresis dead-band calibration, continuous full-load 400 bar pressure endurance tracking, and casing leak seal integrity prior to delivery to ensure matching original parameters, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: Bosch Rexroth A6VM Series Template High-Pressure Bent-Axis Variable Displacement Axial Piston Motors

• Displacement Platform Architectures: A6VM107 (107 $cm^3/rev$) / A6VM200 (200 $cm^3/rev$)

• Target Customized Identification Codes: A6VM107HA2T / A6VM200EP6D1P001G/65MWV0S4A210F-0

• Maximum Volumetric Displacement & Control Boundaries:

  • Configuration A6VM107 Profile: Max displacement 107 $cm^3/rev$, minimum adjustable setting down to 0 $cm^3/rev$.

  • Configuration A6VM200 Profile: Max displacement 200 $cm^3/rev$, minimum adjustable setting down to 0 $cm^3/rev$.

• Operational Pressure Envelopes:

  • Nominal Continuous Pressure Rating (Ports A or B): 400 bar (40 MPa / 5800 psi)

  • Intermittent Maximum System Peak Limit: Reaches up to 450 bar (45 MPa / 6525 psi)

• Maximum Output Speeds (at minimum displacement setting $V_{g\min}$):

  • Size A6VM107 Platform: Maximum allowable rotational velocity up to 4150 rpm.

  • Size A6VM200 Platform: Maximum allowable rotational velocity up to 3400 rpm.

• Control Modulation Designations:

  • Control Code HA2T: High-Pressure Automatic Control. Dynamically expands motor displacement as system load pressure rises to maximize output torque, fitted with custom-calibrated pressure regulation springs.

  • Control Code EP6D1: Electro-Proportional Control via a 24V DC wet solenoid. Delivers linear, stepless displacement adjustments via input current variations, backed by an integrated pressure-rise override safety cut-off valve.

• Mechanical Interface Integrity (e.g., A6VM200-S4 execution):

  • Input Shaft End: Code S4 standard DIN 5480 involute splined configuration (reinforced execution).

  • Main Port Flanges: Standard SAE High Pressure (Code 62) side-mounted flange layout.

• Total Operating Efficiency Baseline: Rated at $\ge 91\%$ for total mechanical-volumetric combined efficiency under full-load variable strokes.

Key Technical Advantages:

• $40^\circ$ Large bent-axis Swivel Arc for High Speed-to-Torque Ranges: The A6VM series features a wide 40-degree bent-axis travel range. This allows the unit to generate high starting torque ($\ge 92\%$ torque efficiency) at maximum displacement, while reaching high output speeds at minimum displacement, broadening the step-less ratio range for heavy mobile drives.

• Bimetallic Sintered Face Plates with a 9-Piston Tapered Rotary Grid: The cylinder-to-lens-plate interface is machined via a micro-lapped bimetallic copper alloy sintering process, matched to a 9-piston tapered slipper assembly. Tapered pistons maintain precise hydraulic balance under high-speed centripetal rotation, protecting the lubricating oil film during 400 bar pressure cycling and frequent directional shifts to extend operational life by 1.8 times.

• Modular Multi-Functional Governors with Short Control Response Lag: Configurations like the A6VM200EP include a high-precision electro-proportional displacement valve assembly. The internal pilot pistons are case-hardened and balanced for rapid activation. Upon receiving an electrical command or HA2 pilot impulse, the internal servo mechanism adjusts the cylinder angle within 45 milliseconds ($\text{ms}$), minimizing torque interruption during gear shifts or load swings.

• Reinforced Series 65 Cast Steel Enclosures for High External Structural Strength: The structural casing features a thickened, single-piece Series 65 cast steel layout. The drive shaft is supported by an optimized pair of preloaded tapered roller bearings, enabling the motor to directly absorb heavy radial and axial reverse forces transmitted from heavy excavator track drives or planetary hoist gearboxes.

Application Areas:

• Heavy Crawler Excavator & Mobile Field Propulsion: Main hydrostatic crawler traction drives for 30+ ton heavy excavators, tracked road asphalt pavers, and cold milling machinery.

• Heavy-Duty Engineering Winches & Crane Lift Systems: Primary hoist winch components for high-capacity port cranes, piling crane main winches, and offshore marine deep-sea mooring winches.

• TBM Infrastructure & Non-Disruptive Trenchless Drilling: Main cutterhead positioning blocks for Tunnel Boring Machines (TBM) and heavy torque powerhead drives for directional drilling rigs.

Expert Maintenance Tips:

• Mandatory Housing Case Priming Prior to Initial Start is Non-Negotiable: The variable servo cavities within the A6VM series are engineered to precise tolerances, and the bent-axis piston groupings require continuous oil flushing for cooling and lubrication. Once mounted, you must fill the motor housing completely with clean, filtered system oil through the highest case drain port (Port T) and rotate the shaft by hand for at least 3 turns to clear air bubbles before starting. Crank-starting a dry motor will score the valve face and cause the rotating assemblies to seize.

• Enforce an Isolated Drain Line and Hold Active Housing Pressure strictly $\le 2\text{ bar}$: Because the electro-proportional (EP) and automatic pressure (HA) systems rely on precise differential pressures across the internal servo piston, never tie the case drain line into a common return block, main return line, or any manifold fitted with backpressure check valves. Route an oversized, high-pressure flexible line directly back to the reservoir below the oil level. Maintain a regular case pressure below 2 bar, with short peaks under 3 bar. Excessive case pressure will damage the shaft seal lip and disrupt the servo differential pressure, leading to variable control failures or engine stalling.

• Calibrate the PWM Frequency for Proportional Amplifier Cards on Electro-Controlled Loops: For electro-proportional models like the A6VM200EP, configure the controller or PLC amplifier card to run on Pulse Width Modulation (PWM) with a dither frequency calibrated between 100 Hz and 120 Hz. This precise dither current keeps the internal pilot valve spool in a microscopic state of constant motion, overcoming mechanical static friction to reduce hysteresis and ensure smooth variable shifting under heavy lifting loads.