This video from Sears PartsDirect shows how to replace the chain and cable assembly on a chaindrive garage door opener. Located along the rail, the chain and cable assembly connects to the trolley and moves the trolley along the rail to raise and lower the garage door. If your garage door won’t move and the chain and cable assembly is damaged or broken, you can replace it using the steps in this video.

(0:00) Introduction
(0:27) Step 1: Disconnect power
(0:32) Step 2: Take the garage door opener down
(1:44) Step 3: Remove the chain and cable assembly
(2:31) Step 4: Install the new chain and cable assembly
(3:49) Step 5: Tighten the chain
(4:00) Step 6: Reinstall the garage door opener
(4:40) Step 7: Reconnect electrical power
(4:47) Step 8: Adjust the travel limits

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The video includes these parts and tools. Look up your model to make sure you get the right parts for your garage door opener.
Chain and cable assembly
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