Mercedes R172 Power Steering Pump OM651 Diesel Mechanical Oil Unit A0064664701

Mercedes R172 Power Steering Pump OM651 Diesel Mechanical Oil Unit is an original steering system component designed for diesel engines, ensuring stable pressure within the power steering system. The mechanical design of the pump guarantees predictable operation and excellent compatibility with engine accessories, which translates into confident vehicle handling. This is a solution for users looking for a proven, factory-spec power steering pump for diesel-powered Mercedes vehicles.

Specifications and technical data

• SKU: A0064664701-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0064664701
• Substitutable numbers: A0064664701, A 006 466 47 01
• Fuel type: Diesel
• Part type: Power Steering Pump
• Category: Power Steering Pumps

Purpose and technical specifications

The presented pump belongs to the Power steering pumps category and is dedicated to Mercedes vehicles equipped with an OM651 family diesel engine. The mechanical drive of the pump ensures direct torque transfer from the engine, which reduces steering system response delays and promotes predictable vehicle behavior in various road conditions. The pump has been designed for operation in diesel-powered systems, where resistance to long-term loads and stability of operating parameters at varying engine speeds are essential. The OEM design allows for maintaining factory pressure and efficiency characteristics, which is crucial for the proper operation of the steering gear and other system components.

Benefits of using an original power steering pump

Using an original power steering pump in a diesel Mercedes translates into a number of practical benefits:

• maintaining factory steering assistance characteristics,
• consistency with other steering system components,
• reduced risk of noise and vibrations resulting from part mismatch,
• easier diagnostics in the event of potential system faults. As a result, the driver receives predictable, comfortable handling, and the steering system maintains parameters close to factory specifications. The original Mercedes power steering pump also ensures better compatibility with service documentation and workshop procedures.

Condition, installation, and selection by markings

The offered pump comes from the used parts segment, which allows for cost-effective steering system repair while maintaining the original design. The component is intended for installation in place of the factory pump, using existing mounting points and factory hydraulic lines, which facilitates the mechanic's work and reduces service time. Selecting a pump for a specific vehicle should be based on manufacturer markings, the OEM part number, and interchangeable numbers – this allows for verifying compatibility with a specific OM651 engine version and steering system configuration. In case of doubt, it is recommended to compare data with the vehicle documentation or consult a service center specializing in the Mercedes brand.

Application in diesel vehicles

Diesel engines generate different load ranges than gasoline units, which is why a power steering pump for a diesel engine must be adapted to operate at specific rotational speeds and torque characteristics. The presented pump has been developed specifically for such a working environment, which promotes stable system pressure and proper cooperation with the steering gear. A properly selected power steering pump in a diesel vehicle reduces the risk of fluid overheating, pressure drops at low RPMs, and excessive load on the accessory drive. This is particularly important in vehicles used intensively, e.g., on long routes or in fleet applications.

System expansion and related components

If you are planning a comprehensive repair or upgrade of the steering system area in your Mercedes and need other elements from the same group, such as hydraulic lines, fluid reservoirs, or steering gears, check the available parts in the Mercedes power steering pumps category. For users who want to better understand the relationships between the power steering pump, the diesel engine, and other components, a guide describing the selection and operation of fuel supply elements and engine accessories will be helpful – a detailed discussion can be found in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration", where practical tips regarding diagnostics and working with OEM numbers are presented.