BMW Convertible Top Hydraulic Cylinder - Genuine BMW 54347019805

Product Information

BMW Convertible Top diagram for 645Ci, M6, 650i

A convertible top hydraulic cylinder is a key component in a power-operated convertible roof system, responsible for raising and lowering the top. Powered by hydraulic fluid pressure from the pump, the cylinder extends or retracts to move the roof frame smoothly and evenly. Reliable hydraulic cylinders ensure consistent top operation, weather sealing, and ease of use for the driver and passengers.

• Slow or uneven movement of the convertible top when opening or closing.
• Hydraulic fluid leaks visible around the cylinder or inside the cabin/trunk.
• Complete top failure, where the roof will not move due to loss of hydraulic pressure.

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You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.