Mercedes W447 Wiper Arm Windshield Passenger Side Front Left N/S A4478200500

Mercedes W447 Passenger Side Windscreen Wiper Arm (Left Side) is an original part from the Wiper Arms group, designed for the passenger side of the front windscreen. Engineered by the vehicle manufacturer, it ensures correct geometry, stable blade guidance, and reliable water drainage during daily operation.

Specifications and technical data

• SKU: rhd-A4478200500
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4478200500
• Substitutable numbers: A4478200500, A 447 820 05 00, BG
• Location on the vehicle: Front, Left
• Category: Wiper Arms

Vehicle Application and Placement

The presented wiper arm is dedicated for installation on the left side of the front windscreen, corresponding to the passenger position in Mercedes W447 models. The appropriate profiling and length of the arm are adapted to the factory wiper sweep area, allowing for correct windscreen cleaning coverage and proper cooperation with the drive mechanism.

Precise fitting to the specific mounting location reduces vibrations, minimizes operating noise, and helps maintain even blade pressure against the windscreen, which is important for both city driving and highway travel.

Technical and Functional Characteristics

The wiper arm is designed to work with the factory Mercedes wiper system, ensuring it maintains the correct resting position and operating angle. The arm's construction allows for proper transfer of torque from the drive mechanism to the blade, resulting in stable, repeatable movements across the windscreen surface.

The appropriately selected stiffness of the arm limits deflection at higher speeds, and proper blade guidance helps minimize streaks and uncleared areas. This is particularly important in commercial and passenger vehicles where good visibility directly impacts driving comfort and safety.

Item Condition and Benefits of Using Original Parts

The offered wiper arm is a used part, which in practice means you can achieve factory fitment at a more favorable price than a new part. Original origin translates to compliance with the vehicle manufacturer's factory standards, and thus proper alignment with the drive shaft and other wiper system components.

Using an original arm helps avoid problems typical of aftermarket replacements with imprecise dimensions, such as incorrect operating angles, collisions with the bonnet or A-pillar, or excessive strain on the mechanism. This is a particularly beneficial solution for workshops and users who expect predictable installation and stable system operation.

Service and Operational Application

The passenger side wiper arm in the Mercedes W447 is a wear-and-tear item that should be replaced in case of play in the mounting, uneven blade pressure, or mechanical damage. Arm replacement is a typical service operation, often performed concurrently with wiper blade replacement or drive mechanism repair.

For workshops and vehicle fleets, using an original arm from the Wiper Arms group means predictable installation time, no need for modifications, and easier diagnosis of potential future faults.

Related Products and Additional Information

If you are planning a comprehensive repair or upgrade of the front windscreen visibility area in your Mercedes and need other parts from the same group, such as additional arms, mounts, or compatible blade holders, check the available parts in the Mercedes Wiper Arms category.

When selecting used wiper system components, it is advisable to follow proven procedures and verify manufacturer markings – practical tips can be found in the Global Parts guide: Safe Online Purchase of Used Car Parts – A Step-by-Step Guide.