Mercedes Vito Viano W639 Power Steering Rack Pinion Box Gear A6394603400

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes Vito Viano W639 Power Steering Rack Pinion Box Gear is a factory-spec power steering system component designed for installation on the vehicle's front axle. As part of the Steering racks and housings group, it ensures precise transmission of steering input to the wheels and stable vehicle handling. This used original component is a sensible choice for drivers looking for a proven solution at an attractive price.

Specifications and technical data

• SKU: rhd-A6394603400-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6394603400
• Substitutable numbers: A6394603400, A 639 460 34 00, 63911011017
• Location on the vehicle: Front
• Category: Gearboxes, Racks & Pinions

Technical characteristics and purpose

The offered steering rack is dedicated to Mercedes Vito and Mercedes Viano W639 generation models, operating with a rack-and-pinion power steering system. The component is mounted in the front area of the vehicle, allowing for a direct connection to the steering column and tie rods.

This type of solution is responsible for:

• transferring torque from the steering wheel to the front wheel knuckles,
• ensuring appropriate sensitivity and response of the steering system,
• maintaining a stable driving path at various speeds.

Thanks to its design tailored to the W639 platform, the steering rack works with factory mounts and suspension components, which facilitates installation and maintenance.

Benefits of using an original steering rack

Using an original steering rack in a Mercedes Vito or Viano allows you to maintain the vehicle's factory handling parameters. Precise system geometry translates into predictable vehicle behavior, which is important both in daily use and under heavier loads or when driving with cargo.

Key advantages include:

• maintaining compatibility with the factory power steering system,
• correct steering ratio selected by the manufacturer,
• the ability to use existing mounting points without structural modifications.

A used original component is also a way to reduce repair costs while maintaining the proper operating parameters of the steering system.

Selection and vehicle compatibility

To correctly select a steering rack for a specific Mercedes Vito or Viano W639, it is worth paying attention to the manufacturer's markings and reference numbers assigned to this part. The presence of the OEM number and interchangeable numbers in the technical specification facilitates verification of compatibility with the vehicle configuration (engine, model year, equipment version).

Precise fitment of the steering rack to the given model minimizes the risk of installation problems, leaks, or improper power steering operation. In case of doubt, it is worth comparing the data with service documentation or the numbers found on the currently installed part.

Condition, installation, and service recommendations

The steering rack comes from dismantling and is offered as a used part, which allows for an economical repair of the steering system while maintaining the manufacturer's original specifications. Before installation, a standard check of tightness, operating clearances, and the condition of covers and ends of cooperating elements is recommended.

During replacement, it is worth paying attention to:

• correct positioning of the steering rack relative to the vehicle's axis,
• proper bleeding of the power steering system after connecting the lines,
• checking and, if necessary, correcting the front wheel geometry after completing the work.

Installation performed in this way allows you to fully utilize the potential of the part and ensure stable, predictable vehicle handling.

Expanding the steering system in Mercedes Vito and Viano

If you are planning a comprehensive repair or upgrade of the steering area in your Mercedes and need other elements from the same group, such as additional steering racks, housings, or related mounting components, check the available parts in the Mercedes steering racks and housings category.

For drivers interested in a broader look at the used parts market, optimizing service costs, and practical tips on selecting components, the following guide article may be helpful: Used car parts for Mini Cooper – a way for style and savings.