Rexroth A6VM140 Variable Displacement Motor | A6VM140HA1 A6VM140HD1 | Hydraulic Piston Motor

The A6VM Series axial piston variable motors from Chengyuan Hydraulic are high-pressure bent-axis units fully compatible with Rexroth Series 63 standards. Specifically designed for hydrostatic transmissions, the A6VM140 features a wide displacement adjustment range, providing exceptional output torque and speed performance under high-pressure conditions. For core models like A6VM140HA1 (Automatic high-pressure related control) and A6VM140HD1 (Hydraulic direct control), we utilize reinforced rotary groups and wear-resistant port plates. Every motor undergoes 100% full-load simulated condition testing to ensure smooth displacement transition at 400 Bar continuous pressure, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: A6VM Series (Design Series 63)

• Max Displacement ($V_{g max}$): 140 $cm^3$

• Min Displacement ($V_{g min}$): 0 $cm^3$ (or as specified)

• Nominal Pressure: 400 bar (40 MPa)

• Maximum Pressure: 450 bar (45 MPa)

• Max Speed (at $V_{g max}$): 3350 rpm

• Max Intermittent Speed (at $V_{g min}$): 5100 rpm

• Control Type: HA1 (Automatic high-pressure related) / HD1 (Hydraulic direct control)

• Seals: FKM (Viton) standard

• Weight: Approx. 80 kg

Key Technical Advantages:

• 40° Bent-Axis Design: The classic bent-axis geometry allows for a high power-to-weight ratio and a vast displacement ratio ($V_{max}/V_{min}$), delivering superior acceleration and gradeability for mobile machinery.

• Precision HA1/HD1 Regulation: The integrated control mechanisms are precisely calibrated. The HA1 control adjusts displacement automatically based on system pressure, while the HD1 offers stepless, precise regulation via pilot pressure.

• Excellent Low-Speed Stability: Optimized clearances between the piston-cylinder interface and spherical port plate technology ensure smooth operation at extremely low speeds without “cogging” or “crawling.”

• Heavy-Duty Bearing System: Equipped with oversized tapered roller bearings designed to handle high axial and radial loads, significantly extending the service life in harsh operating environments.

Application Areas:

• Construction Machinery: Excavator track drives, roller vibration drives, and rotary drilling rig power heads.

• Lifting Equipment: Main winch or travel motors for crawler cranes.

• Forestry Machinery: Drive and control systems for harvesters and forwarders.

Expert Maintenance Tips:

• Case Drain Pressure: Ensure the case drain pressure does not exceed 2 bar during operation. Excessive pressure will damage the shaft seal and impair the variable displacement mechanism.

• Initial Priming: Before start-up, the motor housing must be filled with filtered hydraulic oil via the highest drain port to prevent dry-running of the bent-axis components.

• Flushing Valve Usage: For high-power continuous duty, it is highly recommended to utilize the flushing valve to cool internal components and remove fine wear particles.