A6VM160HA2T Rexroth Motor | 450 Bar 160cc Variable Displacement

Product Overview

The A6VM160HA2T/63W-VAB02000A is a 160 cm³/rev displacement model from Bosch Rexroth’s A6VM series 63 generation of bent-axis axial tapered piston variable motors, featuring HA2 automatic high-pressure related control. The manufacturer part number is R902229046.

The A6VM series variable motors employ an axial tapered piston rotary group of bent-axis design, suitable for hydrostatic drives in open and closed circuits, widely used in mobile machinery and stationary industrial applications. Displacement is infinitely variable from Vg max to Vg min = 0. The wide control range enables the variable motor to satisfy requirements for both high rotational speed and high torque. The series features high power density, compact and robust construction, favorable starting characteristics and small swing torque, with cost savings achieved through elimination of gear shifts and the possibility of using smaller pumps.

HA2 control is an automatic high-pressure related control method where displacement is automatically adjusted according to operating pressure, without requiring external pilot signals. This characteristic makes the A6VM160HA2T particularly suitable for travel drive systems requiring automatic speed and torque matching under variable load conditions, such as excavator travel, rotary drill head drives and crane hoist applications.

Every A6VM160HA2T/63W-VAB02000A 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, peak pressure 450 bar, max speed at Vg max 5550 rpm, max speed at Vg<Vg max 7000 rpm, max flow 156 L/min, torque at Δp=400 bar 179 N·m, weight ~16 kg

• A6VM55: Displacement 54.8 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 4450 rpm, max speed at Vg<Vg max 7000 rpm, max flow 244 L/min, torque at Δp=400 bar 349 N·m, weight ~26 kg

• A6VM80: Displacement 80 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 3900 rpm, max speed at Vg<Vg max 6150 rpm, max flow 312 L/min, torque at Δp=400 bar 509 N·m, weight ~34 kg

• A6VM107: Displacement 107 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 3550 rpm, max speed at Vg<Vg max 5600 rpm, max flow 380 L/min, torque at Δp=400 bar 681 N·m, weight ~47 kg

• A6VM140: Displacement 140 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 3250 rpm, max speed at Vg<Vg max 5150 rpm, max flow 455 L/min, torque at Δp=400 bar 891 N·m, weight ~60 kg

• A6VM160 (This Model): Displacement 160 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 3100 rpm, max speed at Vg<Vg max 4900 rpm, max flow 496 L/min, torque at Δp=400 bar 1019 N·m, weight ~64 kg

• A6VM200: Displacement 200 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed at Vg max 2900 rpm, max speed at Vg<Vg max 4600 rpm, max flow 580 L/min, torque at Δp=400 bar 1273 N·m, weight ~80 kg

• A6VM250: Displacement 250 cm³/rev, nominal pressure 350 bar, peak pressure 400 bar, max speed at Vg max 2700 rpm, max speed at Vg<Vg max 3600 rpm, max flow 675 L/min, torque at Δp=350 bar 1391 N·m, weight ~90 kg

A6VM160HA2T/63W-VAB02000A Additional Specifications:

• Model Code: A6VM160HA2T/63W-VAB02000A

• Manufacturer Part Number: R902229046

• 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)

• Peak 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

• Control Type: HA2 automatic high-pressure related control, displacement automatically adjusted according to operating pressure

• Control Start Pressure Setting Range: 80–350 bar (specific setting per nameplate)

• Rotation: Bidirectional (W = bidirectional)

• Mounting Type: Cartridge central flange (63W), ISO 3019-2 4-hole flange

• Shaft Type: DIN 5480 splined shaft

• Port Connections: SAE flange ports (ports A and B)

• 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: ~62.9 kg

Key Technical Advantages

1. HA2 High-Pressure Automatic Control for Load-Adaptive Displacement Regulation

HA2 control is an automatic high-pressure related control method where motor displacement is automatically adjusted according to operating pressure at port A or B, without requiring external pilot or electrical signals. When operating pressure is below the control start pressure (factory set, range 80–350 bar), the motor maintains minimum displacement; when pressure exceeds the control start point, displacement automatically increases with pressure until reaching maximum displacement. This characteristic enables the A6VM160HA2T to automatically match speed and torque under variable load conditions, particularly suitable for excavator travel drives and rotary drill head applications with frequently varying loads.

2. 40° Bent-Axis Tapered Piston Design for High Power Density and Starting Efficiency

The A6VM160 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 force directly to the drive shaft through a thrust plate. The bent-axis architecture delivers high torque at startup, with rated torque of 1,019 N·m at Δp=400 bar. Volumetric efficiency exceeds 97% with mechanical efficiency exceeding 93%, leading among comparable variable motors.

3. Wide Displacement Range for Full-Range Efficiency

The A6VM160HA2T’s displacement is infinitely variable from Vg max = 160 cm³/rev to Vg min = 0. The maximum displacement mode delivers maximum torque for heavy-duty startup and grade climbing; the minimum displacement mode significantly increases speed capability (up to 4,900 rpm) for light-load high-speed cruising. The zero displacement function allows the output shaft to idle, reducing hydraulic system power loss and heat generation in transport mode.

4. Compact Robust Construction and Long Service Life

The A6VM160HA2T features a compact and robust design weighing approximately 62.9 kg, with class-leading power density among comparable variable motors. The bent-axis design has been proven over more than 50 years in high-pressure variable hydraulic transmission applications, offering significant mechanical efficiency advantages under high-pressure conditions. The housing is constructed from high-strength cast iron with excellent rigidity and heat dissipation. The motor delivers long service life and low maintenance requirements for demanding applications in construction machinery, mining equipment and lifting equipment.

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

Each A6VM160HA2T/63W-VAB02000A 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 3019-2 and DIN 5480 standards, matching the original Rexroth A6VM160 series exactly, enabling direct replacement without any interface modification.

Application Areas

The A6VM160HA2T series is widely deployed in travel drive and tool drive systems of mobile hydraulic equipment:

• Excavator Travel Drives: track excavator travel motors, combined with A4VG series variable pumps in closed-circuit drivetrains

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

• Lifting Equipment: crawler crane travel drives, hoist drives

• Mining: subsurface loaders, mining truck travel drives

• Wheel Loaders: travel drive systems

• Concrete Equipment: concrete mixer truck closed-circuit drives

• Marine & Offshore: deck machinery, winch drives

Expert Maintenance Tips

1. HA2 Control Start Pressure Verification: The HA2 control start pressure is factory set within the range of 80–350 bar, with the specific setting indicated on the motor nameplate. Before installation, verify the control start pressure matches the load characteristics of the machine’s hydraulic system. If displacement response is premature or delayed, adjust the spring preload screw on the control valve to change the control start pressure. After adjustment, verify the displacement-pressure response curve under simulated load conditions.

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. Special attention is required for “drive shaft up” mounting positions where thorough priming and venting are essential to avoid the risk of dry running. 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. The A6VM series is not suitable for operation with HFA hydraulic fluid. If HFB, HFC or HFD or environmentally acceptable hydraulic fluids are used, limitations regarding technical data and seals must be observed. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.

4. Drain Line Management and Installation Position: Case drain from the pump housing must be discharged to the tank via the highest drain port (T1, T2). For combinations of multiple units, ensure that the respective case pressure of each unit is not exceeded. When pressure differences exist at the drain ports of the units, the shared drain line must be replaced so that in no case is the minimum permissible case pressure of all connected units exceeded. If this is not possible, separate drain lines should be laid as necessary. For favorable noise values, all connecting lines should be separated using elastic elements and installation above the reservoir should be avoided.

5. Periodic Tapered Piston Group and Bent-Axis Bearing Inspection: The A6VM160’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.