Rexroth A6VM280 Variable Motor | A6VM55EP2/63W | Axial Piston Variable Motor

The Rexroth A6VM Series from LIC Hydraulic is a premier Axial Piston Variable Motor utilizing advanced Bent-Axis technology. Designed for both open and closed-circuit systems, models like the A6VM280EP6 and A6VM55EP2 are built to deliver maximum torque and dynamic speed control. The A6VM series is renowned for its high displacement ratio, allowing machinery to transition seamlessly between high-tractive force and high-speed travel. We provide 100% drop-in replacements for original Rexroth units, ensuring OEM-level volumetric efficiency and robust reliability for your heavy-duty equipment.

Technical Highlights

• Sizes: A6VM55, 80, 107, 160, 200, 250, 280 (up to $1000\text{ cc}$ available).

• Nominal Pressure: Up to $400\text{ bar}$ ($5800\text{ psi}$).

• Peak Pressure: $450\text{ bar}$ ($6525\text{ psi}$).

• Control Types: EP (Electric Proportional), HD (Hydraulic Proportional), HA (Automatic High-Pressure Control).

Core Advantages

• Extended Speed Range: The high displacement ratio minimizes the need for mechanical gearboxes, simplifying the drivetrain and reducing total vehicle weight.

• Superior Starting Torque: Bent-axis geometry ensures that the pistons maintain optimal leverage, providing smooth and powerful startups even under full load.

• Robust High-Pressure Performance: Engineered with precision-lapped valve plates and hardened rotating groups to withstand continuous high-pressure cycles in mining and construction.

• Versatile Control Options: Integrated electronic controls (EP6/EP2) allow for precise interfacing with vehicle management systems for optimized fuel efficiency and machine productivity.

Application Areas

• Cranes & Lifting: Main and auxiliary winch motors for mobile and crawler cranes.

• Drilling Equipment: Primary drive for rotary heads in piling and geothermal rigs.

• Traction Drives: High-speed tracking for excavators, pavers, and forestry equipment.

• Marine & Offshore: Heavy-duty winch systems and deck machinery.

Expert Maintenance Tips

• Case Drain Protocol: Always connect the case drain line to the highest available port to prevent air pockets. The case must remain full of oil to ensure the bearings are properly lubricated and cooled.

• Filtration: Due to the high precision of the bent-axis piston set, maintain fluid cleanliness at ISO 18/16/13 or better. Contamination is the leading cause of “swash plate” scoring and loss of variable control.

• Seal Inspection: Periodically check the shaft seal for leakage. High case back-pressure is the common culprit for seal failure and can lead to catastrophic oil loss during high-speed operation.