Rexroth A2VK28MAOR4GOPE1-SO2 Hydraulic Piston Pump

Model decoding: A2VK28MAOR4GOPE1-SO2
According to the naming convention of Rexroth, we can break it down:

A2V: Series code. Represents the inclined axis axial piston variable displacement pump, used for closed circuits (i.e. the pump's inlet and outlet are directly connected to the motor, forming a closed oil circuit circulation). This is its most core feature.
K: Installation and connection form. Usually refers to special shaft end, flange, or port designs. Specific details need to be checked in the table, but the "K" type is one of the more common variants.
28: Specification/displacement. This is a key parameter. 28 represents a geometric displacement of approximately 28 cc/rev (milliliters per revolution). This is the maximum displacement of the pump.
M: Variable control method. M represents hydraulic control with power limiter. This is a displacement adjustment method based on pressure signals. When the system pressure increases, the pump displacement will automatically decrease, thereby achieving constant power control (i.e. pressure x flow ≈ constant) and preventing engine overload.
A: Rotation direction. A represents counterclockwise rotation when viewed from the shaft end. This is one of the standard directions.
O: Axial extension form. O usually represents a cylindrical shaft with a flat key.
R4: Connection form of working oil port. R4 represents four threaded oil ports (usually two high-pressure ports A/B and two low-pressure ports T1/T2), and the specific thread standards need to be checked in the table (which may be metric or imperial UNF threads).
G: Sealing material. G usually represents fluororubber (FKM) seals, which have good high temperature resistance and resistance to various hydraulic oils.
OPE1: Special Design Code. This section contains very specific customized information, such as:
OP: May indicate special surface treatment or coating.
E1: May represent specific control curves, spring settings, or versions used for specific engines (such as die-casting machines, ships). This information must be fully confirmed by consulting the original order data or technical manual of Rexroth.
SO2: Design serial number/version number. S usually represents "Special" or a specific design batch, and O2 is the specific version number. This is crucial for spare parts traceability and precise matching.
Main technical features and applications
Structural principle: Oblique shaft design, where the cylinder axis forms a certain angle (oblique shaft angle) with the drive shaft axis, and variables are achieved by changing the oblique shaft angle. This structure transmits high torque, has a long bearing life, and has good impact resistance.
Control characteristics:
M-type control (hydraulic power control): is its core advantage. It senses system pressure through a power limiter (usually a spring-loaded regulating valve). When the pressure rises to the set value, the valve core moves to direct the pressure oil to the variable mechanism of the pump, pushing the inclined shaft angle to decrease, thereby reducing the displacement and maintaining the input power basically constant. This is very suitable for engine driven equipment, as it can fully utilize engine power without stalling.
Usually, it also integrates pressure cutoff and minimum displacement limit functions.
Typical application: This closed pump with power control is widely used for:
Construction machinery: walking drive system for excavators and loaders.
Industrial equipment: main drive pumps for injection molding machines and die-casting machines.
Ship machinery: winches, servos.
Metallurgical equipment: auxiliary transmission for rolling mills.
System composition: As a closed pump, it usually works together with a make-up pump (usually built-in or located nearby) and a closed circuit valve block (integrated flushing valve, safety valve, etc.).

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