The Marantec 116213 Straight Extension Arm Kit is an OEM door arm component designed to extend the reach and improve the lifting geometry between a Marantec garage door opener trolley and the door’s top bracket. Used in conjunction with the standard curved door arm, this straight extension helps achieve smooth, reliable opening and closing—especially when extra reach is needed due to door reinforcement struts, taller top sections, or unique mounting conditions. It’s an ideal replacement part for a bent or worn door arm extension and a practical upgrade to restore proper travel on residential sectional garage doors.
This factory Marantec kit is intended for select Marantec residential garage door operators; verify compatibility by matching part number 116213 with your opener’s parts manual or model-specific parts list. No wiring or programming is required since the component is purely mechanical. Typical installation involves securing the door in the closed position, disconnecting power to the opener, and attaching the straight extension between the curved arm and the door bracket or trolley using the appropriate clevis fasteners specified by Marantec. After installation, recheck up/down travel limits and ensure the door is properly balanced and reinforced at the top section. For safety, disconnect power before service and follow all Marantec instructions regarding use with sectional doors and approved reinforcement brackets. This OEM straight extension arm kit supports dependable operation for compatible Marantec Synergy and other residential openers and is commonly searched as a garage door opener arm, door arm extension, or replacement Marantec 116213.