Mercedes Vito Viano W639 Adjustable Steering Column Shaft Tube A6394621620

Description

Mercedes Vito Viano W639 Adjustable Steering Column Shaft Tube is a precision component of the vehicle’s steering system, responsible for a stable connection between the steering wheel and the steering mechanism. Thanks to its factory design intended for Vito and Viano W639 models, it ensures correct steering system geometry and comfortable steering wheel position adjustment. This used component from the original Mercedes production line is a sensible choice for professional repairs or restoring a vehicle to its factory specifications.

Specifications and technical data

• SKU: rhd-A6394621620-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6394621620
• Substitutable numbers: A6394621620, A 639 462 16 20
• Category: Steering Columns

Purpose and function in the steering system

The steering column in the Mercedes Vito/Viano W639 is responsible for transferring movement from the steering wheel to the subsequent elements of the steering system and for enabling ergonomic adjustment of the driving position. The adjustable design allows the steering wheel position to be tailored to the driver’s height and preferences, which improves vehicle control and safety while driving.

The original column designed for the W639 platform maintains proper operating angles, connection rigidity, and compatibility with factory mounts in the dashboard and engine compartment. As a result, installation is straightforward, without the need for structural modifications.

Construction and fitment for Mercedes Vito / Viano W639

The adjustable steering column for the W639 is constructed as a complete column tube with an adjustment mechanism, prepared for use with the factory steering wheel and other system components. The applied design solutions ensure:

• stable guidance of the steering shaft throughout the entire adjustment range,
• adequate torsional rigidity during maneuvers and braking,
• maintenance of alignment between the steering wheel and the steering gear.

Thanks to the preservation of the original geometry, it is easier to achieve the correct steering wheel alignment relative to the wheels after replacing the column and to avoid unwanted play or vibrations. This is particularly important in commercial vehicles, where the steering system operates under higher loads.

Benefits of using an original steering column

Choosing a used, original steering column for the Mercedes Vito/Viano W639 is a solution that combines economic aspects with the preservation of factory parameters. Key advantages include:

• compatibility with factory mounting points – no need for body adaptation or additional brackets,
• predictable steering system behavior after installation,
• the ability to restore proper steering wheel position adjustment after damage to the previous column,
• consistency with other Mercedes steering system components.

This solution is particularly recommended for post-accident repairs, replacing a worn-out column, or eliminating play and knocking sounds within the steering column area.

Professional installation and steering system diagnostics

When replacing the steering column in a Mercedes Vito/Viano W639, installation in a specialized service center is recommended to ensure proper tightening of mounts, steering axis alignment, and verification of cooperation with other system components. After installation, it is worth performing:

• a check for play throughout the entire adjustment range,
• a check of the steering wheel’s movement smoothness,
• verification of the correct steering wheel alignment relative to the wheels after a test drive.

To better understand the operation of the entire system and typical signs of wear, the guide article on the construction of the steering system and power steering, as well as typical steering column faults, will be helpful, where you will find practical diagnostic tips.

Expanding repairs within Mercedes steering columns

If you are planning a comprehensive repair or upgrade of the steering area in your Mercedes and need other components from the same group, such as additional columns, intermediate shafts, or adjustment elements, check the available parts in the Mercedes Steering Columns category.

For Mercedes vehicles equipped with advanced all-wheel-drive systems, it is also worth considering the specifics of how the steering system interacts with the drivetrain, which is discussed in more detail in the comparative material on AWD drive systems, including Mercedes solutions.