The Marantec 8030734 Curved Door Arm is an OEM replacement linkage for Marantec residential garage door openers. This curved segment connects the opener’s trolley to the door bracket as part of the two-piece arm assembly, creating the proper travel arc so a sectional door moves smoothly through the track radius. By restoring the correct geometry between the operator and the top door section, it helps reduce binding, improves opening and closing consistency, and maintains safe, reliable operation on compatible Marantec systems.
Use this part when the existing curved arm is worn, bent, or missing. It installs at the door end of the linkage and typically mates with the straight door arm that connects to the trolley; reuse the factory pins/fasteners or those specified by your opener manual. Always verify compatibility by matching Marantec part number 8030734 with your operator’s parts list. For safety, disconnect power, secure the door, confirm the door is properly balanced, and recheck travel limits and force settings after installation. This genuine Marantec component is intended for residential sectional garage doors on chain- or belt-drive openers that specify the curved arm in a two-piece linkage design.