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