The Rexroth A4VG series axial piston pump is a high-performance, high-pressure, variable displacement hydraulic pump manufactured by Bosch Rexroth. It's widely used in various closed-circuit hydraulic drive systems. With its excellent performance, compact design, and outstanding reliability, the A4VG series pumps serve as core power components in hydraulic drive systems for construction machinery, agricultural machinery, industrial equipment, and more.

Operating Principle

The A4VG series pump utilizes a swashplate-type axial piston design. Its fundamental operating principle is to convert mechanical energy into hydraulic energy:

Swashplate Design: Multiple pistons inside the pump are arranged in a circular pattern, concentric with the drive shaft. These pistons contact and are pushed by an inclined plate—the swashplate.
Variable Displacement: As the drive shaft rotates, the pistons reciprocate within their barrels due to the swashplate's inclination. By changing the swashplate's angle, the stroke length of each piston can be infinitely varied, allowing for stepless adjustment of the output displacement per revolution, which in turn precisely controls the flow.
Flow Direction Change: When the swashplate passes through its neutral position, the flow direction can be smoothly reversed. This is crucial for controlling forward and reverse motion in closed-circuit systems.

Key Features

The A4VG series pumps boast a range of significant features that make them stand out in the market:

High Power Density: Thanks to their high-pressure rating (rated pressure of 400 bar, maximum pressure of 450 bar, and even higher for some models), A4VG series pumps can deliver substantial power output in a compact size.
Closed-Circuit Design: Primarily designed for closed-circuit hydrostatic transmissions, ensuring high efficiency and reliable power transmission.
Integrated Auxiliary Pump: Integrates a charge pump and pilot pump, providing charge oil and control pressure to the system, which simplifies system design.
High-Pressure Relief Valve with Charge Function: The high-pressure relief valve includes an integrated charge function, effectively protecting the hydraulic system from overload and ensuring the proper operation of the charge circuit.
Adjustable Pressure Cut-off: Often comes standard with an adjustable pressure cut-off feature, further enhancing system safety and control flexibility.
Through-Drive Option: Offers a through-drive option, making it convenient to mount other pumps of the same size, enabling multi-pump combinations to meet the needs of complex systems.
Multiple Control Options: Provides various control and regulation devices, including hydraulic proportional control (pilot pressure dependent), mechanical servo control, electro-proportional control, speed-dependent automatic control, and more, allowing selection based on specific application requirements.
Low Noise Operation: Features an optimized design for smooth operation, with reduced vibration and noise emissions.
Robust and Durable: Designed to be robust, offering a long service life and reducing maintenance costs.

Application Areas

Due to their exceptional performance and adaptability, Rexroth A4VG series pumps are utilized in a wide range of industries and applications:

Construction Machinery: Widely used in the travel systems and work implement hydraulic systems of excavators, loaders, cranes, road rollers, pavers, concrete pump trucks, and other construction equipment.
Agricultural Machinery: Provides power for precise control and efficient operation in agricultural equipment such as combine harvesters, tractors, and sprayers.
Road Construction Machinery: Used in the hydraulic drive systems of various road construction equipment.
Port Machinery: Plays a crucial role in dock cranes, modular transport vehicles, and other port equipment.
Industrial Applications: Also suitable for industrial hydraulic power units requiring adjustable power output and high efficiency.
Marine Applications: Can be used in steering systems, winches, and deck machinery on vessels, where reliable hydraulic power is needed in harsh marine conditions.
Mining Equipment: Provides powerful and durable hydraulic solutions in drilling rigs, conveyors, crushers, and other mining equipment.

Typical Technical Specifications (May vary by specific model)

Feature	Description
Rated Pressure	400 bar (up to 450 bar for some series and sizes)
Maximum Pressure	450 bar (up to 500 bar or more for some series and sizes)
Sizes (Displacement)	Typically covers 28 to 280 cm³/rev, with larger or smaller sizes available in some series.

Rexroth A4VG Series Hydraulic AXIAL PISTON Pump Models:

A4VG125EP2D1/32R-NZF02F001DH
A4VG125EP2DM1/32L-NZF02F001S
A4VG125EP2DT1/32R-NZF02F001S
A4VG125HD1D1/32R-NZF02F001D
A4VG125HD1D2/32R-NSF02F071S
A4VG125HD1DM1/32L-NSF02F001S
A4VG125HD1MT1/32R-NSF02F021S
A4VG125HDMT1/32R-NSF02F691S
A4VG125HWD1/32L-NZX02F001S
A4VG125HWD1/32R-NZF02F071D-S
A4VG125HWD1/32R-NZF02F071D
A4VG125MSD1/32R-NSF02F021D
A4VG125EP4D1/32L-NAF02F691DP +A11VO95LRDS/10L-NSD12N00
A4VG125EP4D1/32R-NAF02F691DP +A11VO95LRDS/10R-NSD12N00
A4VG180EP4D1/32R-NTD02F691DP +A11VO130LRDS/10R-NSD12K01-S
A4VG180EP2DM1/32L-NZD02F001D
A4VG180DA2D2/32L-NSD02F001DT
A4VG180HD3DT1/32R-NZD02F01XS-SK
A4VG180EP4DT1/32L-NZD02F001PP
A4VG180DA2D2/32L-NZD02F001SH
A4VG180DA2D2/32R-NZD02F041SH
A4VG180HD9MTE/32R-NSD02F00
A4VG28EZ1DM1/32L-NZC10N005E
A4VG28HWD1/32R-NZC10N005E
A4VG40EZ1DM1/32L-NSC02F003S
A4VG56DA1D7/32R-NZC02F005SH
A4VG56DA1D7/32R-NZC02F005SH-ES
A4VG56DA1D7/32R-NZC02F005SH-ES
A4VG56DA2D2/32R-NZC02F013SH-S
A4VG56EP2D1/32R-NSC02F005SH-E
A4VG56HWD1/32R-NSC02F025S
4VG56HWDT1/32R-NSC02K023E-S
A4VG71DA1DT4/32R-NZF02F001DH
A4VG71DA1DT4/32R-NZF02F001DH
A4VG71DA2D2/32L-NTF02F021SH
A4VG71DA2D2/32L-NTF02F021SH
A4VG71DGDT1/32L-NTF02F021S
A4VG71DGDT1/32L-NTF02F021S-S
A4VTG71HWCSD32L-NLD10F001S-S
A4VG71EP2D1/32R-NZF02F011SH-E
A4VG71EP2DT1/32R-NSF02F041DH-E
A4VG71HD1D1/32R-NZF02F001F-E
A4VG71HWD1/32R-NZF02F001S
A4VG71HWDT1/32R-NZF02KXX1E-S
A4VG71HWDT1/32R-NZF02KXX1E-S
A4VG90EP2D1/32R-NSF02F041KH-E
A4VG90EP2DM1/32L-NSF02F001FH
A4VG90EP2DT1/32R-NZF02F071DH-E
A4VG90EP2MT1/32L-NSD10F011ST-S
A4VG90HD1DT1/32L-NZF02F001D-E
A4VG250EP2D1/32R-NZD10F721S+A4VG250EP2D1/3VR-NSD10F071S
Concrete pump hydraulic pump A4VG140DA202/32R-NAF02F691DH Rexroth Hydraulic Pump
A4VG140DA202/32R-NAF02F691DH
A4VG125DA202/32R-NAF021
R902158158 A4VG71EZ2DMT1/32R-NZF02F001DP-S
R902113262 A4VG71HD3D2/32R-NAF02F021D SV
R902113313 A4VG71HD3DT1/32R-NAF02F01XS-S
R902155775 A4VG71HD3DT1/32R-NSF02F011S
R902155608 A4VG71HW/32+A4VG40EZ2/32
R902105364 A4VG71HWDL1/32R-NAF02F071D-S
R902102213 A4VG90DWDMT1/32R-NSF02F021P-S
R971045605 A4VG90EP1D1/32R-NAF02F011SP-K
R902155948 A4VG90EP4D1/32+A4VG90EP4D1/32+A10VO60DFR
R971040259 A4VG90EP4D1/32R-NZF02F001BP
R902155845 A4VG90EP4DT1/32L-NAF02F011DP-SK
R971052262 A4VG90EP4DT1/32R-NAF02F021DP
R971036265 A4VG90EP4DT1/32R-NAF02F071DP-S
R902104338 A4VG90HWDL1/32R-NAF02F071D-S SV
R902497025 A4VSO250EO2/30R+A4VSO250EO2/30R
R902481044 A4VSO500DP/30R+A4VSO500DP/30R
R902132671 A4VTG071HW100/33MRNC4C82F0000AS-0
R902155546 A4VTG090HW100/33MRNC4C92F0000AS-0
R902155618 A4VTG090HW100/33MRNC4C92F0000AS-0
R902155964 A6VE107HA1T/63W-VZL02000A
R902155848 A4VG40EP4/32+A10VG28EP4/10-K
R971044974 A4VG40EP4/32+A4VG40EP4/32
R902155836 A4VG40EP4D1/32L+A10VG45EP4D1/10L-K
R902155854 A4VG40EP4D1/32L-NAC02F025SP-K
R902168765 A4VG40EP4D1/32L-NAC02F045FP
R902155834 A4VG40EP4D1/32L-NSC02F025FP-K