Mercedes R172 Folding Top Roof Hydraulic Cylinder Left N/S A1728000372

The Mercedes R172 Cabrio Soft Top Actuator Left is an original component of the soft top opening system, designed for precise operation on the left side of the vehicle. As part of the Soft Tops for Convertibles and Parts group, it ensures stable mechanism guidance, correct movement geometry, and safe folding and unfolding of the cover. A used actuator allows for a technically correct repair of the roof system while maintaining Mercedes' original design concept.

Specifications and technical data

• SKU: A1728000372
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1728000372
• Substitutable numbers: A1728000372, A 172 800 03 72
• Location on the vehicle: Left
• Category: Convertible Tops & Parts

Actuator Purpose and Function

The roof actuator in the R172 model is responsible for the controlled movement of the folding roof segments, working in conjunction with other hydraulic and mechanical elements. The version installed on the left side of the vehicle is tailored to the specific body geometry, enabling:

• smooth guidance of the roof structure throughout its full range of operation,
• maintenance of correct panel positioning relative to the frame and seals,
• reduction of stress at critical mounting points,
• preservation of the roof's seal and proper closure when in the closed position.

By using an original solution, compatibility with the factory control system and other roof system components is maintained.

Left-Side Compatibility and Installation

The presented actuator is designed for installation on the left side of the vehicle, which is crucial for the correct operation of the entire mechanism. Its design, mounting points, and operating range are optimized for a specific side of the body, making this component non-interchangeable with the right-side actuator.

During installation, it is recommended to:

• check the condition of mountings and joints within the folding roof assembly,
• verify the correct setting of the roof's end positions after installation,
• perform a functional test using the factory control system.

Using an original actuator helps minimize the need for additional adjustments and simplifies future system servicing.

Characteristics of the Used Component

The offered actuator is a used part from disassembly, enabling an economical repair while maintaining Mercedes' original construction quality. A used component is a good choice wherever compliance with the factory design is important, and cost optimization for servicing is also a priority.

For roof system components, it is particularly important to maintain consistency among all cooperating parts – using an original actuator minimizes the risk of problems with closing, leaks, or mechanism malfunctions.

Mercedes Soft Tops for Convertibles and Parts – Expansion and Service

If you are planning a comprehensive repair or upgrade of the roof area in your Mercedes and need other parts from the same group, such as guides, additional actuators, or mounting elements, check the available parts in the category Mercedes Soft Tops for Convertibles and Parts.

Technical Support and Accident Repairs

When working on the body and roof structure, it is advisable to familiarize yourself with best practices for selecting parts from disassembly, inspection procedures, and repair examples. A detailed discussion of these topics can be found in the article Body and Chassis – Accident Repairs Using Disassembled Parts, which helps in consciously planning the scope of work and selecting appropriate components.