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This manufacturer-approved garage door opener drive and worm gear kit (part number 41A2817) fits many garage door openers including Craftsman garage door opener model 13918315SR. This kit also fits certain LiftMaster and Chamberlain garage door opener models.
Unplug the garage door opener before installing the drive and worm gear kit.
Pull the manual release rope to disengage the garage door opener trolley. Follow the instructions included with the kit to install the new drive and worm gear kit. Adjust the up and down travel limits according the instructions in your owners manual after installing the new drive and worm gear.