Mercedes W177 Window Regulator Lifter Mechanism Rear Left Door N/S A1777300302

Mercedes W177 Rear Left Window Regulator is an original part from the Window Regulators and Motors category, designed for the rear left window in the W177 body style. This solution is for users who expect reliable operation of the window lifting mechanism and the preservation of the system's factory functionality.

Specifications and technical data

• SKU: A1777300302-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1777300302
• Substitutable numbers: A1777300302, A 177 730 03 02
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Vehicle Application and Fitment

The regulator is designed for installation on the rear left side of the vehicle, allowing for precise replication of the factory window travel within the door. Its placement on the vehicle has been selected to work with the original mounting points, guides, and door seals in the Mercedes W177 model.

By utilizing a solution from the window regulators and motors group, the component integrates with the factory window control system, ensuring smooth opening and closing, and proper window positioning within the door frame.

Construction and Technical Characteristics

The window regulator is responsible for transferring the drive from the control system to the side window, maintaining its stable guidance throughout the entire range of motion. The design intended for the rear left side of the vehicle ensures:

• proper fit to the door geometry in the Mercedes W177,
• compatibility with the factory window control motor,
• stable window guidance within the tracks during driving and when stationary.

This type of solution is particularly important in vehicles equipped with electric window controls, where repeatable, predictable mechanism operation and correct window sealing against the rubber seals are required.

Condition of the Part and Benefits of Choosing a Used Part

The offered regulator is from the used parts category, which allows for reduced repair costs while maintaining the original assembly specifications. In practice, this means the possibility of restoring the functionality of the rear left window without the need to invest in a new part, while simultaneously maintaining compatibility with the factory window system.

Choosing a used window regulator is also a beneficial solution from a vehicle operation perspective – the part comes from the same production line as factory-installed components, which facilitates installation and reduces the risk of fitment issues.

Application in Service and Repairs

The rear left window regulator is suitable for both routine repairs and comprehensive door restoration after a collision or mechanical damage. It is particularly useful in situations where symptoms such as:

• the window not responding to commands from the control panel,
• uneven window lifting or lowering,
• the window stopping halfway through its travel range.

Replacing the component with an original regulator designed for the rear left side allows for the restoration of correct system operation without the need for modifications to the electrical or mechanical installation.

Mercedes Window Regulators and Motors – Selection and Extended Offer

If you are looking for other Mercedes Window Regulators and Motors compatible with various models of this brand, check out our dedicated category: Mercedes Window Regulators and Motors. There you will find a wide selection of components designed for side window systems, which will facilitate comprehensive vehicle servicing in one place.

More on the Cost-Effectiveness of Used Parts

When planning repairs to the window system, it is worth understanding the broader economic and technical context of using components from the secondary market. Issues related to selecting used components, cost analysis, and practical examples are described in the article: Why Buy Used Gearboxes and Engines – Facts Instead of Myths. Although it concerns other part groups, the principles presented there help in making informed decisions also when choosing used body and accessory parts.