A6VE55EZ4 Rexroth Variable Plug-in Motor 54.8cm³ 400bar

Product Overview

The A6VE55EZ4/63W-VZL027 is a Bosch Rexroth A6VE series (series 63) bent-axis variable plug-in axial piston hydraulic motor designed for open and closed circuits. Featuring a recessed mounting flange for direct insertion into mechanical gearboxes, it offers compact construction and easy installation. Displacement is infinitely variable from Vg max to Vg min = 0. Output speed depends on pump flow and motor displacement; torque increases with differential pressure and displacement. Our A6VE55 and companion sizes A6VE28, A6VE80, A6VE107 are manufactured to original technical specifications, offering 100% interchangeability (flange, shaft end, and port positions fully match OEM) and 100% simulated-duty testing. They deliver high efficiency and robust performance under high pressure and variable speeds as reliable, cost-effective direct replacements for genuine Rexroth motors.

Technical Specifications 

• Model: A6VE55EZ4/63W-VZL027 (series also available in A6VE28, A6VE55, A6VE80, A6VE107)
• Displacement Vg max: 54.8 cm³/rev
• Displacement Vg min: 0 cm³/rev (infinitely variable)
• Nominal pressure: 400 bar
• Peak pressure: 450 bar (intermittent)
• Maximum speed at Vg max: 4450 rpm
• Maximum speed at reduced displacement: up to approx. 7000–8350 rpm (subject to maximum permissible inlet flow)
• Maximum inlet flow: approx. 244 L/min
• Theoretical torque (Δp = 400 bar, Vg max): approx. 349 Nm
• Control: EZ4 electric two-point control (24 V, on/off switching of displacement)
• Direction of rotation: bidirectional (W)
• Approx. weight: 26–28 kg
• Design: Bent-axis variable plug-in motor for open and closed circuits; optional flushing valve

Key Technical Advantages

1. Precision bent-axis piston design and high-accuracy machining deliver superior volumetric and hydro-mechanical efficiency, high power density, and excellent starting characteristics.
2. Infinitely variable displacement down to zero provides a wide control range for both high-speed/low-torque and low-speed/high-torque operation; EZ4 electric control offers precise and reliable switching.
3. Recessed mounting flange enables compact, direct plug-in installation into mechanical gearboxes with no tolerance adjustments required, saving space and simplifying assembly.
4. Full dimensional and performance interchangeability plus rigorous simulated-duty testing guarantee drop-in replacement of original Rexroth units, minimizing downtime and lifecycle costs.

Application Areas

Ideal for mobile machinery, construction equipment, agricultural machinery, mining equipment, and industrial hydraulic systems requiring high power density and variable speed/torque, especially plug-in applications integrated into mechanical gearboxes. Typical uses include crawler excavators, cranes, concrete pump trucks, drilling rigs, and closed-circuit hydrostatic transmissions.

Expert Maintenance Tips

• Verify exact match of mounting flange, shaft end, and port orientation before installation; ensure cleanliness and alignment when plugging into the gearbox; avoid forced assembly.
• For EZ4 electric control, maintain stable 24 V supply and reliable wiring; periodically check solenoid response and switching time.
• Monitor case drain pressure and temperature during commissioning and regular service; enable flushing circuit when required to prevent overheating or cavitation.
• Use matching filter elements and hydraulic fluid (HLP mineral oil per DIN 51524); record operating pressure and speed profiles to detect early efficiency decline.