The Marantec 118798 Trolley Assembly is a genuine OEM carriage (also called the shuttle or travel carriage) for select Marantec residential garage door openers. This component rides along the opener rail, couples to the opener’s drive system, and connects to the door arm to move the door open and closed. It also incorporates the emergency release mechanism so the door can be disengaged from the opener when needed. Use it as a direct replacement when the original carriage is worn, cracked, or the release no longer operates reliably. For accuracy, confirm compatibility by matching part number 118798 in your opener’s owner’s manual or rail parts diagram, or by checking with Marantec support; this part is designed for specific Marantec rail systems and is not universal across all models.
Installation typically involves disconnecting power to the opener, ensuring the door is secured, pulling the emergency release, relieving belt tension per Marantec instructions, sliding off the old trolley, and installing the new assembly in the correct orientation before re-tensioning and re-engaging the drive. After replacement, follow your opener’s manual to verify travel limits and force settings or run any required auto-learn procedure. This OEM Marantec trolley assembly supports smooth, consistent travel on compatible belt-drive rail systems used in residential applications and helps restore quiet, reliable operation while maintaining the designed safety features of the opener.