Position a work table near the area under your motor unit to hold the garage door opener.
How to replace garage door opener sprocket.
Refer to the opener s installation instructions or the manufacturer s website for the correct chain tension and.
This was a craftsman model 139 53976srt.
If it is just a gear you are replacing you should remove it after you have unbolted assembly and replace it with a new one by going in reverse order.
Simply remove those for replacement.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Use a step ladder to access the garage door opener s power cord and motor unit.
Remove the chain and cable assembly.
After adjusting the chain lubricate it with the recommended lubricant or lithium grease that s used on bicycle chains.
Lower the motor unit down.
10 return to the floor and pull the manual release cord to refit the trolley to the chain arm putting your door opener back into automatic mode.