A6VM160HD1D/63W-VAB010B Rexroth Motor | 450 Bar 160cc Excavator Travel

Product Overview

The A6VM160HD1D/63W-VAB010B is a 160 cm³/rev displacement model from Bosch Rexroth’s A6VM series 63 generation of bent-axis axial tapered piston variable motors, featuring HD1D control type (hydraulic pilot control). It is a high-pressure variable motor developed specifically for excavator travel drive systems. The manufacturer part number is R902067962.

The A6VM series employs an axial tapered piston rotary group of bent-axis design, suitable for hydrostatic drives in both open and closed circuits. Displacement is infinitely variable from Vg max to Vg min = 0, with the wide control range enabling the variable motor to satisfy requirements for both high rotational speed and high torque. The series is suitable for mobile and stationary applications, with compact and robust construction delivering long service life and high power density.

The model code breaks down as follows: A6VM identifies the A6VM series bent-axis variable motor; 160 denotes the 160 cm³/rev displacement; HD1D is the control type code (HD=hydraulic pilot control, 1=control generation, D=control variant); 63W indicates series 63, with W being the shaft configuration code; VAB010B is the mounting flange, port configuration and additional option combination code.

Every A6VM160HD1D unit undergoes 100% simulated operating-condition bench testing prior to shipment, covering pressure cycling, displacement response, control signal calibration and thermal shock. Mounting flange, shaft end and port dimensions comply with ISO/SAE standards and are identical to the original Rexroth A6VM160 series, ensuring true drop-in interchangeability with zero modification required.

Technical Specifications

A6VM Series Frame Size Specifications:

• A6VM28: Displacement 28.1 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 5550 rpm, max flow 156 L/min, torque at 400 bar 179 N·m, weight 16 kg

• A6VM55: Displacement 54.8 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 4450 rpm, max flow 244 L/min, torque at 400 bar 349 N·m, weight 26 kg

• A6VM80: Displacement 80 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 3900 rpm, max flow 312 L/min, torque at 400 bar 509 N·m, weight 34 kg

• A6VM107: Displacement 107 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 3550 rpm, max flow 380 L/min, torque at 400 bar 681 N·m, weight 47 kg

• A6VM140: Displacement 140 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 3250 rpm, max flow 455 L/min, torque at 400 bar 891 N·m, weight 60 kg

• A6VM160 (This Model): Displacement 160 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 3100 rpm, max flow 496 L/min, torque at 400 bar 1019 N·m, weight 64 kg

• A6VM200: Displacement 200 cm³/rev, nominal pressure 400 bar, max pressure 450 bar, max speed 2900 rpm, max flow 580 L/min, torque at 400 bar 1273 N·m, weight 80 kg

• A6VM250: Displacement 250 cm³/rev, nominal pressure 350 bar, max pressure 400 bar, max speed 2700 rpm, max flow 675 L/min, torque at 400 bar 1391 N·m, weight 90 kg

A6VM160HD1D Additional Specifications:

• Model Codes: A6VM160HD1D/63W-VAB010B, A6VM160HD1D/63W-VAB020B, A6VM160HD1D/63W-VAB370B

• Manufacturer Part Number: R902067962 (VAB010B)

• Type: Bent-axis axial tapered piston variable motor

• Maximum Displacement: 160 cm³/rev

• Minimum Displacement: 0 cm³/rev (infinitely adjustable to zero)

• Nominal Pressure (Continuous): 400 bar (5,800 psi)

• Maximum Pressure (Intermittent): 450 bar (6,525 psi)

• Maximum Speed (Vg max): 3,100 rpm

• Maximum Speed (Vg < Vg max): 4,900 rpm

• Maximum Flow: 496 L/min

• Torque at Δp=400 bar: 1,019 N·m

• Torque Constant: 2.54 N·m/bar

• Control Type: HD1D hydraulic pilot control

• Rotation: Bidirectional (clockwise / counter-clockwise)

• Mounting Flange: SAE standard flange

• Shaft Type: Splined shaft (ANSI B92.1a)

• Circuit Compatibility: Open circuit / closed circuit universal

• Operating Temperature Range: -40°C to +115°C

• Case Volume: 2.4 L

• Moment of Inertia: 0.0253 kg·m²

• Weight: ~64 kg

Same Series Model Comparison:

• VAB010B (R902067962): HD1D control, SAE flange, standard port configuration

• VAB020B (R902031857): HD1D control, nominal pressure 350 bar, max pressure 450 bar, suitable for HFA/HFB/HFC hydraulic fluids

• VAB370B: HD1D control, SAE flange, different port configuration version

Key Technical Advantages

1. Bent-Axis Tapered Piston Design for High Power Density and Starting Efficiency

The A6VM160HD1D employs Rexroth’s signature bent-axis axial tapered piston rotary group design, with the cylinder block angled relative to the output shaft and tapered pistons transmitting torque through a thrust plate. The bent-axis architecture delivers high torque at startup with favorable starting efficiency. The compact construction and weight of only 64 kg deliver class-leading power density among variable motors of comparable displacement. Tapered pistons with precision-ground cylinder bores minimize internal leakage, maintaining high volumetric efficiency across the entire displacement range.

2. High Pressure Capability — 400 Bar Nominal, 450 Bar Peak

The A6VM160HD1D supports 400 bar nominal working pressure and 450 bar maximum working pressure, enabling adaptation to high power-density open and closed circuit hydraulic systems. At Δp=400 bar pressure differential, rated torque reaches 1,019 N·m with a torque constant of 2.54 N·m/bar. This pressure rating offers significant advantages in excavator travel drive and swing drive heavy-duty intermittent applications.

3. HD1D Hydraulic Pilot Control for Precise Displacement Modulation

This model is configured with HD1D hydraulic pilot control, achieving stepless displacement modulation through pilot pressure signals. The control method supports continuous variation from zero to maximum displacement, precisely matching excavator speed and torque requirements under different operating conditions. The wide control range enables the variable motor to deliver both high rotational speed and high torque, achieving smooth switching between low-speed high-torque climbing and high-speed flat ground travel in excavator travel mode.

4. Bidirectional Rotation and Open/Closed Circuit Compatibility

The A6VM160HD1D supports bidirectional rotation for hydrostatic drives in both open and closed circuits. Closed circuits offer advantages including closed-loop fluid circulation, excellent contamination control and energy recovery potential—ideal for travel drives and vehicle transmissions. The zero displacement function allows the output shaft to idle, reducing hydraulic system power loss and heat generation in transport mode, further improving machine transport speed and fuel efficiency.

5. 100% Simulated Load Testing & Drop-In Interchangeability

Each A6VM160HD1D unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, displacement response, control signal calibration and thermal variation. Mounting flange, shaft end and port dimensions comply with ISO/SAE standards, matching the original Rexroth A6VM160 series exactly, enabling direct replacement without any interface modification.

Application Areas

The A6VM160HD1D series is widely deployed in travel drive systems of mobile hydraulic equipment:

• Excavator Travel Drives: track excavator travel motors, combined with A4VG series variable pumps in closed-circuit drivetrains, e.g. Caterpillar 300 series, Komatsu PC series

• Rotary Drilling Rigs: power head drives and travel drive systems

• Wheel Loaders: travel drive systems

• Road Rollers: vibratory roller travel drives

• Concrete Equipment: concrete mixer truck closed-circuit drives

• Mining: subsurface loaders, mining truck travel drives

• Lifting Equipment: crawler crane travel drives

Expert Maintenance Tips

1. Hydraulic Pilot Control Signal Calibration and Displacement Verification: The HD1D hydraulic pilot control requires control signal calibration after installation to confirm minimum displacement position (0 cm³/rev) and maximum displacement position match the technical manual. Pilot control pressure should remain stable within the technical manual specified range with ±1 bar variation. If displacement response exhibits lag or drift, inspect the control spool for sticking and the pilot circuit for air entrainment. Establish a displacement-pilot pressure calibration curve in the machine control system to ensure travel drive speed control accuracy.

2. Housing Priming Before First Startup: Before first startup, fill the motor housing (case volume 2.4 L) with clean hydraulic oil through the drain port. An unprimed housing causes dry friction at startup, severely damaging the piston group and distribution mechanism. After extended shutdown, fill the housing again before restarting. The drain port must return to the reservoir independently—housing back pressure must not exceed 2 bar. The drain line end must remain submerged to prevent air ingestion.

3. Oil Cleanliness and Temperature Control: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. Operating oil temperature should be kept below 80°C—system temperature must not exceed 115°C at any point. VG 46 or VG 68 hydraulic oil is recommended at 60°C operating temperature, with the higher viscosity class VG 68 preferred. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.

4. Zero Displacement Function and Transport Mode Maintenance: The A6VM160HD1D’s zero displacement function significantly increases machine transport speed. In transport mode with displacement near zero, verify that the gearbox lubrication system remains operational. Inspect system pressure, flow and temperature parameters in zero displacement mode every 500 hours to confirm proper operation and gearbox lubrication.

5. Periodic Tapered Piston Group and Bent-Axis Bearing Inspection: The A6VM160HD1D’s tapered pistons, piston rings and bent-axis bearings are primary wear components. Inspect tapered piston-to-cylinder bore clearance, piston ring wear and bent-axis bearing clearance every 2,000 hours. Abnormal efficiency loss, noise or vibration requires immediate shutdown and service. Use Rexroth original specification parts when replacing piston groups to ensure fit accuracy and assembly torque per technical manual requirements.

6. Hydraulic Fluid Type Precautions: The A6VM series motors are not suitable for operation with HFA hydraulic fluid. If HFB, HFC or HFD hydraulic fluids or environmentally acceptable hydraulic fluids are used, limitations regarding technical data or other seals must be observed. The VAB020B model is suitable for HFA/HFB/HFC hydraulic fluid systems.