Rexroth A4VG40 A4VG56 A4VG90 A4VG125 A4VG180 A4VG250 Series 40 Variable Displacement Pump

Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the leading manufacturers and suppliers of Rexroth A4VG40 A4VG56 A4VG90 A4VG125 A4VG180 A4VG250 Series 40 Variable Displacement Pump in China. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. Also, OEM&ODM service is available.

 

 

If you are designing or specifying a hydrostatic drive system for industrial machinery, mining equipment, marine applications, or forging presses, your first question is likely: "How much flow do I need, and at what pressure?"

The Bosch Rexroth A4VG Series 40 is the latest-generation closed-circuit variable displacement axial piston pump platform from Rexroth-representing a significant step forward from the earlier Series 32. While Series 32 covers smaller displacements (28–125 cc/rev) at 400 bar nominal pressure, Series 40 covers larger displacements (110–280 cc/rev) at 450 bar nominal pressure, with 500 bar peak capability.

What makes Series 40 different?

The jump from 400 bar to 450 bar nominal pressure is not just a number. It delivers higher power density-more hydraulic power from the same physical package size. For equipment designers, this means you can achieve higher system performance without increasing the pump's mounting footprint.

The A4VG Series 40 is an axial piston variable pump in swashplate design for hydrostatic drives in a closed circuit. The volumetric flow is proportional to the drive speed and the displacement, and the flow rate can be varied continuously by adjusting the swashplate angle. When the swashplate is moved through the neutral position, the flow direction changes smoothly-eliminating the need for external directional valves.

Which A4VG do you need? That depends on three questions:

What flow does your system require? → determines which displacement (110–280 cc/rev)

What pressure does your system need? → determines whether Series 40 (450 bar) or Series 32 (400 bar)

What control logic does your machine use? → determines EP, HD, HA, HW, DA, or EZ

 

 

2.1 Pressure and Power Density – 450 Bar Nominal, 500 Bar Peak

The A4VG Series 40 operates at 450 bar nominal pressure and 500 bar maximum pressure. This represents a 12.5% pressure increase over Series 32 (400 bar nominal).

What does this mean for your machine? Higher pressure means higher power density-you get more hydraulic power from the same physical package. For example, the A4VG280 delivers 482 kW of power and 1,918 Nm of torque at 450 bar. Achieving that same power with a 400 bar pump would require a larger displacement-and a larger physical footprint.

Pressure rating across all Series 40 models: All six displacements (110, 125, 145, 175, 210, 280) share the same pressure capability-450 bar nominal, 500 bar peak. Your choice is driven entirely by flow requirement, not by pressure capacity.

Key decision point: If your system requires maximum pressure above 400 bar, Series 40 is your only choice within the A4VG platform. If your system operates comfortably at 400 bar and your flow requirement is below 125 cc/rev, Series 32 may be more cost-effective.

 

2.2 Integrated Boost Pump and Through-Drive – System Integration Advantages

The A4VG Series 40 comes standard with an integrated boost pump that serves two purposes: supplying boost oil to the closed circuit and providing pilot control oil for the displacement control system. A boost pressure relief valve protects the low-pressure side from overpressure.

What this means for your system design: You do not need to specify, purchase, or plumb a separate charge pump. The boost pump is already there-one less component to source, one less leak point to worry about.

Through-drive capability is another standard feature. The pump shaft extends through the housing, allowing additional pumps of up to the same nominal size to be mounted directly behind the main unit. This is particularly valuable in multi-circuit systems-such as a mining vehicle with separate drives for propulsion, steering, and auxiliary functions-where a single mounting location and single drive coupling serve multiple pump stages.

 

2.3 High-Pressure Relief Valves with Integrated Boost Function – Built-In System Protection

Two high-pressure relief valves are provided on the high-pressure side to protect the hydrostatic transmission (pump and motor) from overload. These valves also function as boost valves-when the system pressure drops, they allow oil from the boost circuit to enter the low-pressure side, maintaining loop pressure.

Standard adjustable pressure cutoff provides additional control over system pressure. Once the system reaches the set pressure, the pump destrokes to maintain pressure without overloading the system.

What this means for your machine: Built-in protection means you do not need to add external relief valves to the high-pressure lines. The pump arrives ready to install, with safety features already integrated.

 

2.4 Control Options – Choose Based on Your Machine's Control Logic

The A4VG Series 40 offers a wide range of control variants. Choosing the right one is as important as choosing the right displacement:

Control Type	What It Does	Best For
EP (Electric Proportional)	Displacement controlled by a proportional solenoid valve (12V or 24V)	Machines with electronic control systems (PLC, CAN bus)-precision control, automation-ready
HD (Hydraulic Proportional)	Displacement proportional to pilot pressure	Machines with hydraulic pilot controls-joystick-operated systems
HA (Hydraulic Automatic)	Displacement automatically controlled by system pressure	Applications where load varies continuously-excavator travel drives
HW (Hydraulic with Mechanical Servo)	Mechanical servo-assisted hydraulic control	Applications requiring direct mechanical feedback
DA (Speed-Related Hydraulic)	Displacement controlled by input speed	Applications requiring speed-dependent displacement-fan drives
EZ (Electric Two-Point)	Switches between two fixed displacements via on/off solenoid	Simple two-speed applications

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, HD or HA are more appropriate. If you need simple two-speed operation, EZ is the most cost-effective option.

 

Q1: What is the difference between A4VG Series 32 and Series 40?

Feature	Series 32	Series 40
Displacement range	28–125 cc/rev	110–280 cc/rev
Nominal pressure	400 bar	450 bar
Maximum pressure	450 bar	500 bar
Typical applications	Smaller excavators, compact equipment	Large industrial machinery, mining, marine

Series 40 is the latest-generation high-pressure platform-higher pressure, higher power density, and designed for larger displacement applications.

 

Q2: What are the displacement options in the A4VG Series 40?

The Series 40 covers six displacements: 110, 125, 145, 175, 210, and 280 cc/rev.

 

Q3: How do I choose between 110, 125, 145, 175, 210, and 280?

Ask yourself one question: What flow does my system require?

Model	Flow at Rated Speed	Best For
A4VG110	348 L/min	Entry-level Series 40. Lowest cost in the range
A4VG125	375 L/min	Slightly higher flow than 110
A4VG145	414 L/min	Mid-range-balanced flow and footprint
A4VG175	465 L/min	Higher flow for larger machines
A4VG210	527 L/min	High flow for heavy industrial applications
A4VG280	673 L/min	Maximum flow-the flagship Series 40 model

Rule of thumb: Choose the smallest displacement that meets your flow requirement. This gives you the highest possible speed and the most compact package.

 

Q4: What is the pressure rating for the A4VG Series 40?

450 bar nominal, 500 bar peak. This applies to all Series 40 models (110 through 280).

 

Q5: What is the difference between EP, HD, HA, HW, DA, and EZ control?

Control	Type	How It Works
EP	Electric proportional	Proportional solenoid valve controls displacement
HD	Hydraulic proportional	Pilot pressure controls displacement
HA	Hydraulic automatic	System pressure automatically controls displacement
HW	Hydraulic with mechanical servo	Mechanical servo-assisted hydraulic control
DA	Speed-related hydraulic	Input speed controls displacement
EZ	Electric two-point	On/off solenoid switches between two displacements

 

Q6: Does the A4VG Series 40 include a boost pump?

Yes. Every A4VG Series 40 pump includes an integrated boost pump that supplies both boost oil and pilot control oil.

 

Q7: Does the A4VG Series 40 support through-drive mounting?

Yes. Through-drive is a standard feature, allowing additional pumps of up to the same nominal size to be mounted directly behind the main unit.

 

Q8: What is the recommended case drain backpressure limit?

Maximum permissible case drain pressure: 2.5 bar (36 psi) continuous. Exceeding this limit can compromise the shaft seal. Route the drain line directly to the reservoir with the outlet submerged below oil level.

 

Q9: What is the weight of each Series 40 model?

A4VG110: 88 kg

A4VG125: 84 kg

A4VG145: 106 kg

A4VG175: 115 kg

A4VG210: 152 kg

A4VG280: 160 kg

 

Q10: What is the speed range for the A4VG Series 40?

Model	Rated Speed (at Vg max)	Intermittent Maximum
A4VG110	3,150 rpm	3,350 rpm
A4VG125	3,000 rpm	3,150 rpm
A4VG145	2,850 rpm	3,000 rpm
A4VG175	2,650 rpm	2,800 rpm
A4VG210	2,500 rpm	2,650 rpm
A4VG280	2,400 rpm	2,550 rpm

 

Q11: What hydraulic fluids are compatible with the A4VG Series 40?

The A4VG Series 40 is compatible with mineral oil (ISO VG 32–68). For environmentally acceptable fluids, please consult the specific data sheets as limitations may apply.

 

Q12: What mounting interfaces are available?

The A4VG Series 40 is available with SAE standard mounting flanges. Shaft options include spline shafts and keyed shafts.

 

Q13: What optional features are available?

Optional features include:

Hall-effect swivel angle sensor – for contactless detection of swivel angle, compatible with BODAS controllers, IP67/IP69K protection

High-speed version – for applications requiring higher speeds

 

Q14: Do you provide test reports with each pump?

Yes. Each A4VG Series 40 pump undergoes factory testing before shipment. We can provide hydrostatic test certificates, pressure/flow performance data, and test videos upon request.

 

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