Lower the motor unit down.
How ro replace garage door chain.
This should give you room to replace the chain drive module.
To do this put some lubricant on a piece of rag this use the rag to wipe the chain.
Position a work table near the area under your motor unit to hold the garage door opener.
The top two only need to be loosened when you take out the bottom screw the cover will slide down.
Disconnect the trolley threaded shaft from the chain by removing the master link clip on spring master link cap and master link bar.
Press the wall control button or remote so that the opener completes its close.
Pull out the idler pulley bolt and slide the idler pulley out of the rail window.
There are three phillips screws holding on the garage door opener back cover.
You can just let the cover hang by the wires plugged into it.
Use a step ladder to access the garage door opener s power cord and motor unit.
How to put a chain back on an automatic garage door opener.
Remove the chain and cable assembly.
Remove the chain and cable assembly.
I am not a professional.
Disengage the garage door from the opener by pulling down on the emergency pull cord to release the door trolley from the opener carriage.
If the chain on your garage door is rusty you need to apply lubricant into it to loosen the corrosion.
Documenting how i repaired the garage door.