Rexroth Hydraulic Motor AA6vm107 AA6vm160 AA6vm80 AA6vm140

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If you are specifying a hydraulic motor for an excavator swing drive, a crane hoist winch, a drilling rig rotary head, or a road roller propulsion system, your first question is likely: "How much torque do I need, and at what speed?"

The Bosch Rexroth AA6VM Series is one of the most widely deployed variable displacement bent-axis piston motor platforms in the mobile hydraulic industry-with over 30 years of field validation across excavators, cranes, drilling rigs, pavers, and mining equipment.

What makes AA6VM different from other variable motors?

Most variable motors use a swashplate design. AA6VM uses a bent-axis design-where the cylinder block is angled relative to the output shaft. This fundamental architectural difference delivers higher starting torque, better low-speed stability, and lower internal friction than comparably sized swashplate motors. The result is a motor that starts smoothly under heavy load, runs efficiently across a wide speed range, and maintains its performance over decades of service.

AA6VM also gives you flexibility that few other motors can match:

Variable displacement from Vg max down to Vg min = 0 - infinitely adjustable

Works in both open and closed circuits - one motor platform, two system architectures

400 bar nominal / 450 bar peak pressure - built for the most demanding hydraulic systems

Multiple control options - HA, HD, EP, HZ - to match your machine's control logic

Which AA6VM do you need? That depends on three questions:

How much flow does your system deliver? → determines which displacement you need

How much torque does your load require? → determines whether you need 80, 107, 140, or 160

What control logic does your machine use? → determines HA, HD, EP, or HZ

 

 

2.1 Performance – Choose Your Displacement Based on Flow and Torque

The AA6VM series offers four displacements in the most commonly specified range. Here is how to choose:

Your Situation	Recommended Model	Why
Flow available ≤ 312 L/min; torque need ≤ 509 Nm	AA6VM80	Entry-level. 3,900 rpm max speed. Lightest weight (34 kg). Best for compact equipment
Flow available 312–380 L/min; torque need ≤ 681 Nm	AA6VM107	The most popular all-rounder. Balanced flow, speed, and torque. Fits most 20–30 ton excavators
Flow available 380–455 L/min; torque need ≤ 891 Nm	AA6VM140	Higher torque for larger machines. 3,250 rpm max speed
Flow available > 455 L/min; torque need ≤ 1,019 Nm	AA6VM160	Maximum torque in this size class. 3,100 rpm max speed. Best for heavy excavators and cranes

Critical trade-off to understand: Larger displacement gives you more torque but requires more flow from your pump-and reduces maximum speed. If your system pump cannot deliver the required flow, the motor will not reach its rated speed. Always match the motor displacement to your available system flow, not just your torque requirement.

Pressure rating across all four models: All four models share the same pressure capability-400 bar nominal, 450 bar peak. This means your choice is driven entirely by flow and torque, not by pressure capacity.

 

2.2 Bent-Axis Design – Why the Architecture Matters for Your Application

The AA6VM uses a bent-axis design with axial tapered pistons. Here is what that means for your machine:

Higher starting torque: In a bent-axis motor, the piston force is applied more directly to the output shaft. This gives you better acceleration from a standstill-critical for excavator swing drives that must start and stop repeatedly under load.

Better low-speed stability: Bent-axis motors maintain smooth rotation at very low speeds-down to near-zero rpm in some configurations. This matters for crane hoists that require precise load positioning and drilling rigs that need controlled feed rates.

Lower internal friction: The bent-axis geometry reduces side loads on the pistons compared to swashplate designs. This translates to higher efficiency and longer component life-which is why AA6VM motors are known for lasting decades in the field.

Wide swivel range: The AA6VM can swivel from Vg max to Vg min = 0. This means the motor can go from full torque to freewheeling without any external valve-a feature that simplifies hydraulic circuit design and reduces component count.

 

2.3 Control Options – Match the Motor to Your Machine's Logic

The AA6VM series offers multiple control variants. Choosing the right one is as important as choosing the right displacement:

Control Type	What It Does	Best For
HA (Hydraulic Automatic / Pressure Control)	Displacement is automatically controlled by system pressure. As load increases, displacement increases to maintain pressure	Excavator travel drives, wheel loaders-applications where load varies continuously
HD (Hydraulic Two-Position Control)	Switches between max and min displacement via a hydraulic pilot signal	Two-speed applications-travel (high speed/low torque) vs. digging (low speed/high torque)
EP (Electric Proportional Control)	Displacement is controlled by a proportional solenoid valve (12V or 24V)	Machines with electronic control systems (PLUS+1, CAN bus)-precision control, automation-ready
HZ (Hydraulic Two-Point Control)	Hydraulically switched between two fixed displacements	Simpler two-speed applications where electronic control is not available

How to choose: If your machine already has an electronic control system (PLC, CAN bus), EP gives you the most flexibility. If your machine uses hydraulic pilot controls, HA or HD are more appropriate. If you need simple two-speed operation, HD or HZ are the most cost-effective options.

 

2.4 Open and Closed Circuit Capability – One Motor, Two System Types

Most hydraulic motors are designed for either open-circuit or closed-circuit systems-not both. The AA6VM is designed for both.

In a closed circuit: The motor is part of a hydrostatic transmission with a variable pump. This is the most common configuration for excavator travel drives, crane hoists, and drilling rig rotary heads. The closed circuit allows for smooth speed control, dynamic braking, and high efficiency.

In an open circuit: The motor is connected to a standard directional valve. This configuration is more common in industrial applications, stationary machinery, and some mobile equipment where the hydraulic system is simpler.

What this means for you: If you are replacing a motor and are unsure whether your system is open or closed-or if you are designing a machine that might be used in both configurations-the AA6VM gives you the flexibility to cover both without changing motor platforms.

 

 

 

The AA6VM series is used across a wide range of mobile and industrial applications. Here is how the different displacements map to real-world machines:

3.1 Excavator Swing and Travel Drives

Application: The motor drives the excavator's upper structure rotation (swing) or track propulsion (travel).

Why AA6VM: Excavator swing drives require high starting torque to accelerate the heavy upper structure from a standstill, and smooth low-speed control for precise positioning. The bent-axis design delivers both. The HA control automatically adjusts displacement as load changes-accelerating rapidly at low displacement (high speed) and automatically increasing displacement as load builds.

Machine Size	Recommended Model	Rationale
15–25 ton excavators	AA6VM80 or AA6VM107	Swing and travel drives in this size class typically need 300–500 Nm of torque
25–35 ton excavators	AA6VM107 or AA6VM140	Higher inertia requires more torque-681–891 Nm range
35–50 ton excavators	AA6VM140 or AA6VM160	Maximum torque for the largest conventional excavators

 

3.2 Crane Hoist and Swing Winches

Application: The motor drives the main hoist winch for lifting loads, or the swing winch for rotating the crane superstructure.

Why AA6VM: Crane hoists require precise low-speed control for load positioning and high torque for lifting heavy loads. The ability to swivel to zero displacement allows the motor to freewheel during rapid load descent-reducing heat generation and improving efficiency.

Crane Type	Recommended Model	Rationale
50–100 ton mobile cranes	AA6VM107 or AA6VM140	Hoist winch torque requirements in this range
100–250 ton crawler cranes	AA6VM140 or AA6VM160	Maximum torque for heavy lifting

 

3.3 Drilling Rig Rotary Heads

Application: The motor drives the rotary head that turns the drill string.

Why AA6VM: Drilling requires variable speed depending on ground conditions-fast rotation in soft ground, slow rotation with high torque in hard rock. The AA6VM's wide control range and ability to operate at very high speeds make it ideal for this application.

Rig Type	Recommended Model	Rationale
Small foundation drilling rigs	AA6VM80 or AA6VM107	Lower torque requirements
Large rotary drilling rigs (SANY, XCMG, Zoomlion)	AA6VM140 or AA6VM160	High torque for large-diameter drilling

 

3.4 Road Rollers and Pavers

Application: The motor drives the propulsion system or vibration mechanism of road construction equipment.

Why AA6VM: Road rollers require smooth acceleration and deceleration for consistent mat quality. The AA6VM's low-speed stability and wide control range deliver this.

 

3.5 Marine and Offshore Applications

Application: The motor drives winches, thrusters, or deck machinery on vessels.

Why AA6VM: Marine applications demand corrosion-resistant construction and reliable operation in harsh environments. The AA6VM's robust design and long service life make it a trusted choice for offshore equipment.

 

 

 

 

Q1: What is the difference between AA6VM and A6VM?

There is no difference. The "A" in AA6VM simply indicates the latest generation of the A6VM platform. Both designations refer to the same bent-axis variable displacement motor series from Bosch Rexroth.

 

Q2: What are the displacement options in the AA6VM series?

The AA6VM series covers displacements from 28 to 1000 cc/rev. The most commonly specified models for mobile equipment are 80, 107, 140, and 160 cc/rev.

 

Q3: How do I choose between AA6VM80, 107, 140, and 160?

Ask yourself two questions:

What flow does my system deliver? → 80 needs 312 L/min; 107 needs 380 L/min; 140 needs 455 L/min; 160 needs 496 L/min (all at rated speed)

What torque does my load require? → 80 delivers 509 Nm; 107 delivers 681 Nm; 140 delivers 891 Nm; 160 delivers 1,019 Nm (all at 400 bar)

Choose the smallest displacement that meets your torque requirement-this gives you the highest possible speed.

 

Q4: What is the pressure rating for the AA6VM series?

For 28–200 cc models: 400 bar nominal, 450 bar peak.
For 250–1000 cc models: 350 bar nominal, 400 bar peak.
All four models covered here (80, 107, 140, 160) are in the 400/450 bar category.

 

Q5: What is the difference between HA, HD, EP, and HZ control?

Control	Type	How It Works
HA	Hydraulic automatic	Pressure-controlled-displacement adjusts automatically based on system pressure
HD	Hydraulic two-position	Pilot pressure switches between max and min displacement
EP	Electric proportional	Proportional solenoid valve (12V/24V) controls displacement
HZ	Hydraulic two-point	Hydraulically switched between two fixed displacements

 

Q6: Can the AA6VM be used in both open and closed circuits?

Yes. The AA6VM is designed for both open and closed circuit applications. This is one of its key differentiators from many competing motors that are limited to one circuit type.

 

Q7: What is the recommended operating speed range?

Rated speed at full displacement:

AA6VM80: 3,900 rpm

AA6VM107: 3,550 rpm

AA6VM140: 3,250 rpm

AA6VM160: 3,100 rpm

At reduced displacement, maximum speeds are significantly higher-up to 6,150 rpm for the 80 cc model.

 

Q8: What is the weight of each model?

AA6VM80: 34 kg

AA6VM107: 47 kg

AA6VM140: 60 kg

AA6VM160: 64 kg

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