A6VM107HD2/63W-VZB380B-S Rexroth Motor 107cc 450 bar

Product Overview

The A6VM107HD2/63W-VZB380B-S is a bent-axis axial piston variable displacement motor built on the Bosch Rexroth A6VM Series 63 platform, in the A6VM107 displacement size (107 cm³/rev). The motor features a bent-axis design with an axial tapered piston rotary group, engineered for hydrostatic drives in both open and closed circuits. It offers a nominal pressure of 400 bar, maximum pressure of 450 bar, rated speed of 3,550 rpm, maximum flow of 380 L/min, theoretical torque of 681 N·m (Δp=400 bar), and a weight of approximately 47 kg.

The A6VM series is Rexroth’s all-purpose high-pressure variable motor, featuring a bent-axis design widely used in mobile and stationary hydraulic drive applications. The motor’s displacement is infinitely variable from Vg max to Vg min = 0. Through this wide control range, the variable motor satisfies the requirements for both high speed and high torque.

The model code A6VM107HD2/63W-VZB380B-S decodes as follows: A6VM107 designates the series and displacement size (bent-axis variable motor, 107 cm³/rev), HD2 is the control device code (hydraulic control related to pilot pressure, control pressure increase Δp = 25 bar), 63 is the series designation (Series 63), W indicates bidirectional rotation, and VZB380B-S is the port configuration, shaft type, and special option code. The motor features HD2 hydraulic pilot proportional control, where the control function is proportional to the pilot pressure applied at port X, achieving stepless displacement adjustment.

Engineered as a form-fit-function replacement for original Bosch Rexroth A6VM107 series motors, this model maintains identical mounting flange dimensions, shaft specifications, and port locations, enabling drop-in interchangeability. Each unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications 

• Model: A6VM107HD2/63W-VZB380B-S

• Material Number: R902107816

• Series: Bosch Rexroth A6VM Series 63

• Motor Type: Bent-axis axial piston variable displacement motor

• Design Feature: Bent-axis configuration, axial tapered piston rotary group, stepless variable

• Maximum Displacement (Vg max): 107 cm³/rev (6.53 in³/rev)

• Minimum Displacement (Vg min): ≈ 0 cm³/rev (infinitely variable)

• Nominal Pressure (p nom): 400 bar (40 MPa / 5,800 psi)

• Maximum Pressure (p max): 450 bar (45 MPa / 6,525 psi)

• Rated Speed (Vg max): 3,550 rpm

• Max. Speed (Vg < Vg max): 5,600 rpm

• Maximum Flow (qV max): 380 L/min

• Theoretical Torque (Δp=400 bar): 681 N·m

• Rotation: Bidirectional (W)

• Mounting: SAE flange or DIN flange

• Control Method: HD2 — Hydraulic control related to pilot pressure, control pressure increase Δp = 25 bar

• Circuit: Open circuit / Closed circuit

• Seal Material: FKM

• Weight (approx.): 47 kg

• Optional Features: Flushing valve, boost valve, counterbalance valve, speed sensor

• Hydraulic Fluid: Mineral oil; not suitable for HFA fluids

Key Technical Advantages

1. Bent-Axis Tapered Piston Design with High Power Density

The A6VM107HD2/63W-VZB380B-S employs the classic bent-axis design of the Bosch Rexroth A6VM series, with pistons arranged at an angle to the drive shaft, transmitting torque through spherical contact between tapered pistons and the drive plate. This design achieves a nominal pressure of 400 bar and maximum pressure of 450 bar at 107 cm³/rev, with maximum output torque of 681 N·m, offering high power density and excellent starting efficiency.

2. HD2 Hydraulic Pilot Proportional Control with Stepless Speed Regulation

The HD2 control device provides hydraulic control related to pilot pressure (HD series), where the control function is proportional to the pilot pressure applied at port X, with a control pressure increase Δp = 25 bar. By varying the pilot pressure at port X, motor displacement can be steplessly adjusted between Vg max and Vg min, rather than merely two-position switching. This control method offers high response frequency and control precision, precisely matching motor displacement and speed to system load demand.

3. Wide Control Range with High Speed and High Torque Capability

The A6VM107’s displacement is infinitely variable from Vg max to Vg min = 0, providing an exceptionally wide control range. Through this wide range adjustment, the variable motor satisfies the requirements for both high speed and high torque. At full displacement, the motor delivers maximum torque of 681 N·m for heavy-load starting and climbing conditions; at minimum displacement, maximum speed reaches up to 5,600 rpm for high-speed travel requirements. Output speed depends on pump flow and motor displacement, while output torque increases with the pressure differential between high and low-pressure sides and with increasing displacement.

4. Compact Structure with Multi-Industry Adaptability

The A6VM107 achieves a displacement of 107 cm³/rev and a nominal pressure of 400 bar at a weight of 47 kg, offering an excellent power-to-weight ratio. The motor is suitable for both open and closed circuits, applicable in construction machinery travel drives, rotary drilling rig power head drives, crane winch drives, industrial hydraulic transmissions, and various other scenarios. The A6VM series offers multiple displacement sizes from 28 to 1000 cm³/rev for flexible matching.

Application Areas

• Wheeled Excavators: Hyundai R140W-7/R140W-9 series wheeled excavator travel/drive systems (part number 31N4-45012)

• Crane Winches: Crawler crane winch motors (A6VM107/160/200 configuration)

• Rotary Drilling Rigs: Power head drives and winch drive systems

• Industrial Hydraulic Transmissions: Industrial drive scenarios requiring variable speed/torque with high efficiency

• Heavy-Duty Mobile Equipment: Drilling rigs, mining equipment, and other high-torque, high-reliability drive requirements

Expert Maintenance Tips

1. HD2 Control System Maintenance: Periodically verify the response characteristics of the HD2 hydraulic pilot control mechanism. Check control response linearity every 500 operating hours, confirming that displacement adjustment switching time from minimum to maximum is within specification. If response is sluggish or non-linear, check pilot circuit pressure (control pressure increase Δp = 25 bar) and control valve spool wear.

2. Case Filling and Venting: Before initial installation or startup after extended idle periods, fill the motor housing with clean hydraulic fluid to prevent dry friction on piston pairs during startup. The case drain port must be connected separately to the reservoir, with return lines below the minimum oil level.

3. Hydraulic Fluid Cleanliness and Viscosity Management: Mineral oil hydraulic fluid is recommended (not suitable for HFA fluids). Recommended optimum viscosity range is 16–36 mm²/s. Maintain hydraulic fluid cleanliness at ISO 18/15 or NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.

4. Restart After Extended Storage: For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (10 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.