248739 Chamberlain Garage Door Opener - Overview

Keep the belt on a garage door opener at the proper tension with this spring-loaded trolley nut kit. The assembly fits on the rail system and adjusts how tightly the belt is held. Correct tension helps the trolley move along the rail without a loose or drooping belt. Replacement may be needed if the spring, nut, or nearby hardware is worn...Read more or damaged. Close the garage door and unplug the opener before starting work. Follow the opener manual when setting the tension because the correct spring position can vary.

This is an authentic replacement part sourced directly from the manufacturer. The master link kit may be used with garage door opening systems from Chamberlain and LiftMaster. This kit contains part to replace two complete links in the drive chain, in case of breakage. You may require a chain break tool when replacing this part. This is an individually sold item.

It is a genuine item that is supplied by the original equipment manufacturer for use with Chamberlain and LiftMaster garage door openers. This is an identical replacement for a missing or a damaged light socket that the bulb would connect to. Please make sure to refer to the appropriate diagrams of your specific model for the correct loca...Read moretion and application of this component. Keep in mind this high-quality socket is made of durable materials and is sold individually.