Product Overview
The A6VM107HD1D/63W-VZB380B (Material No. R902117564) is a core model within the 107 frame size of Bosch Rexroth’s A6VM Series of bent axis axial piston variable displacement motors, built on Series 63. The A6VM Series features an axial tapered piston rotary group of bent-axis design, developed for hydrostatic drives in open and closed circuits, suitable for both mobile and stationary applications, covering a complete product matrix from 28 to 1000 cm³/rev.
The A6VM107HD1D/63W-VZB380B has a nominal displacement of 107 cm³/rev, with a nominal working pressure of up to 400 bar and maximum pressure of 450 bar. Maximum torque is approximately 681 N·m (at Δp = 400 bar and Vg max), with maximum speed up to approximately 3550 rpm at Vg max. The motor employs a 40° bent-axis design, offering high power density, compact dimensions, and excellent starting efficiency.
Model code breakdown: A6VM = bent axis axial piston variable displacement motor; 107 = nominal displacement 107 cm³/rev; HD1D = hydraulic control, pressure-related, direct operated; 63W = Series 63, supporting open or closed circuit applications; VZB380B = mounting flange, shaft end, and port configuration code.
The motor’s displacement mechanism employs a bent-axis swivel angle adjustment design, where pistons are connected to the drive disc via ball joint linkages. When high-pressure oil enters the piston bores, the reciprocating motion of the pistons is converted into rotational motion of the drive disc through the linkages, generating output torque. By adjusting the cylinder swing angle (from 0° to maximum value), displacement is continuously varied from Vg max to Vg min = 0, precisely controlling output speed and torque. The design features a spherical control surface distribution plate with self-centering capability, achieving volumetric efficiency over 97% and mechanical efficiency exceeding 93%.
As a drop-in replacement, the motor is fully compatible with the OEM Rexroth specification in mounting interface, control method, and performance characteristics. Every unit undergoes 100% simulation-based testing prior to shipment, covering displacement calibration, torque output, pressure holding, and internal leakage.
Technical Specifications
All parameters below are based on Bosch Rexroth official technical documentation and verified supplier technical pages:
Complete Model: A6VM107HD1D/63W-VZB380B
Material Number (MNR): R902117564
Brand: Bosch Rexroth
Product Series: A6VM series, Series 63
Product Type: Bent axis axial piston variable displacement motor
Nominal Displacement: 107 cm³/rev
Displacement Adjustment Range: 0 – 107 cm³/rev (continuous stepless variable)
Nominal Working Pressure: 400 bar (5800 psi)
Maximum Pressure: 450 bar (6527 psi)
Maximum Torque: Approx. 681 N·m (@ Δp = 400 bar, Vg max)
Maximum Speed (Vg max): Approx. 3550 rpm
Control Type: HD1D — hydraulic control, pressure-related, direct operated
Drive Type: 40° bent-axis design, axial tapered piston rotary group
Mounting: SAE standard mounting flange
Drive Shaft: DIN 5480 splined shaft
Circuit Type: Open and closed circuits
Distribution Plate Technology: Spherical control surface with self-centering, volumetric efficiency > 97%, mechanical efficiency > 93%
Hydraulic Fluid: Mineral oil-based hydraulic fluid
Fluid Temperature Range: 30°C to +90°C
Nominal Pressure (Supplier Data): 32 MPa
Weight: Approx. 47 kg
Mounting Position: Any position
Optional Features: Flushing valve, boost-pressure valve, counterbalance valve (BVD/BVE)
A6VM Series Other Model Specifications Reference:
A6VM28: Displacement 28 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM55: Displacement 55 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM80: Displacement 80 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM107: Displacement 107 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM115: Displacement 115 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM140: Displacement 140 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM160: Displacement 160 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM170: Displacement 170 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM200: Displacement 200 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM215: Displacement 215 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar
A6VM250: Displacement 250 cm³/rev, nominal pressure 350 bar, peak pressure 400 bar
Note: Specifications are based on Bosch Rexroth official technical documentation and verified supplier technical pages (Gerex Automation, Echuan Hydraulic, Hydronex Global Indonesia, Asendorf Hydraulik, etc.). The A6VM Series 63 covers a complete product matrix with displacements from 28 to 1000 cm³/rev. Always verify against the complete model code and consult the latest Rexroth official technical documentation during selection.
Key Technical Advantages
1. Bent-Axis Variable Design for High Power Density and Excellent Starting Efficiency
The A6VM107HD1D employs a proven bent-axis design, where pistons are connected to the drive disc via ball joint linkages. When high-pressure oil drives the pistons in reciprocating motion, it is converted into rotational motion of the drive disc through the linkages, generating output torque. Compared with swashplate designs, the bent-axis architecture provides significant mechanical efficiency advantages under high-pressure conditions. The motor delivers high torque at startup with excellent starting efficiency, and its exceptional slow-running characteristics contribute to precise control capabilities.
2. HD1D Hydraulic Control for Wide Control Range and Fast Response
The HD1D control type is hydraulic, pressure-related, with a direct-operated architecture, allowing precise adjustment of the swivel angle via pilot pressure signals for stepless control of output speed and torque. The variable control piston acts directly on the cylinder swivel angle adjustment mechanism with response time under 0.3 seconds, delivering fast response and high control accuracy. Control oil can be directly drawn from the high-pressure side (for HD, HA, DA control methods), eliminating the need for an external control oil source and simplifying system piping design.
3. Spherical Distribution Plate with Self-Centering Technology for High Efficiency and Long Life
The motor features a proven spherical control surface distribution plate design with self-centering capability, low circumferential velocity, and high efficiency. This configuration ensures optimal contact between the distribution plate and cylinder end face under high-pressure and high-speed operating conditions, achieving volumetric efficiency over 97% and mechanical efficiency exceeding 93%. The bent-axis design combined with precision piston-to-cylinder tolerances maintains stable volumetric efficiency and long service life under high-pressure conditions.
4. Dual-Circuit Compatibility for System Integration Flexibility
The A6VM Series variable motors perform excellently in both open-circuit and closed-circuit applications. In closed-loop applications, combined with variable displacement pumps (e.g., A10VSO and A11VO series), they form hydrostatic transmission systems widely used for power transmission in mobile machinery (excavators, loaders, rollers). Circuit cleanliness and temperature are maintained by a charge pump and flushing valve, enabling stepless speed variation and efficient power transmission. The motor can be optionally equipped with integrated or attached flushing and boost-pressure valves, as well as counterbalance valves (BVD/BVE) for customized system requirements.
5. Complete Specification Coverage with 100% Simulation-Based Testing
The A6VM Series covers a complete displacement range from A6VM28 to A6VM1000, satisfying all requirements from precision industrial transmission micro-torque to high-power heavy-duty drive applications. Every A6VM107HD1D/63W-VZB380B undergoes 100% simulation-based testing prior to shipment, covering displacement calibration, torque output verification, pressure holding performance, and internal leakage detection. As a drop-in replacement, the motor is fully compatible with the OEM Rexroth specification in mounting dimensions (SAE flange), shaft end configuration (DIN 5480 splined shaft), and performance characteristics, enabling direct replacement of the original unit.
Application Areas
Crawler Excavator Travel Drives: Providing high-pressure high-torque hydraulic power for track travel gearboxes — one of the most typical A6VM107 applications
Wheeled Excavator Travel Drives: Travel motors for Hyundai R140W-7/R140W-9 and other mid-size wheeled excavators
Rotary Drilling Rig Power Head Drives: Integrated into gearboxes, providing high-power-density hydraulic drive
Cranes & Winch Mechanisms: Hoisting and slewing motors for crawler cranes and truck cranes, utilizing large displacement for high torque output
Wheel Loaders: Wheel drive systems paired with gearboxes for efficient travel drives
Mining & Tunneling Equipment: Hydraulic drive systems for underground transport vehicles and drilling rigs
Marine & Offshore: Deck machinery, winches, and propulsion system hydraulic transmission
Industrial Hydraulic Systems: Metallurgical equipment, presses, and test rigs requiring high-pressure variable displacement drives
Expert Maintenance Tips
Pre-Installation Checks:
Verify mounting flange (SAE standard) alignment with equipment mounting surface; ensure surface is clean and free of burrs, flatness deviation not exceeding 0.01 mm/100 mm
Inspect DIN 5480 splined shaft mating surface for wear or corrosion; apply appropriate grease
The motor must be fully filled with clean hydraulic oil via the case drain port prior to installation to prevent dry friction damage to piston/cylinder and bearings during startup
Confirm SAE flange port seals are intact; tighten diagonally to specified torque
Confirm rotation direction matches system requirements
Operational Maintenance:
Maintain hydraulic oil cleanliness to ISO 4406 18/16/13 or better; use pressure filters with ≤ 10 μm filtration accuracy
Recommended fluid: mineral oil-based anti-wear hydraulic oil; maintain operating temperature within 30°C to +90°C
Periodically monitor hydraulic oil moisture and particle contamination levels; oil replacement recommended every 1,000 to 3,000 operating hours or every six months
The case drain line must run independently and directly to the hydraulic reservoir, routed via the highest drain port on the case; connecting in series with the system main return line is strictly prohibited
Periodically verify HD1D control pilot pressure stability; confirm control response is sensitive without hysteresis
Periodically inspect shaft seals for aging or leakage; shaft seals recommended for replacement every 5,000 hours
Periodically monitor motor operating temperature and noise level; abnormal increase may indicate internal wear or fluid contamination
Troubleshooting Guide:
Motor fails to rotate or speed abnormal: Check hydraulic system supply pressure; verify HD1D pilot control pressure signal reaches the motor correctly; check oil cleanliness
Displacement control failure or slow response: Check HD1D control pilot pressure is within normal operating range; verify control piston and swivel angle adjustment mechanism are not stuck; check control oil passages for blockage
Insufficient output torque: Confirm system pressure reaches rated value (400 bar continuous / 450 bar peak); inspect pistons and cylinder bores for wear
Abnormal noise or vibration: Check case oil fill level; verify suction line is unobstructed; check mounting bolt tightness
External leakage: Inspect shaft seal for aging or damage; verify case drain line back pressure is within allowable range
