This is a video on how to change the gear sprockets in a craftsman garage door opener.
Instructions on replacing gears in garage door opener.
If yours is a belt drive you need a kit like this https amzn to 2zqns.
Unplug the garage door opener.
1 2 drive gear outside diameter.
This was a craftsman model 139 53976srt.
Get it right the first time.
2 3 4 drive gear number of teeth.
This gear is situated between the belt and the motor drive.
On first few moves the door opens closes fine without any noise but the noise comes out again afterwards.
Remove the chain and cable assembly.
Position a work table near the area under your motor unit to hold the garage door opener.
I followed the instructions here and replace the main gear including shaft 41c4220a i didn t replace the worm gear.
Step 1 unplug opener before doing any work on the garage door opener you must unplug the opener to guard against the possibility of an accident.
It is easier to replace the gear with the opener trolley in the up position.
Pull the chain off the motor unit sprocket and out of the chain spreader.
Pull the emergency release rope and then shut the garage door by hand.
Do the edges appear to be worn down or shredded.
I don t know what it is.
This gear kit on amazon.
My garage door opener 1 2 hp craftsman model 13953600 has grinding noise when door open close.
Replace the main gear drive if the garage door opener makes a grinding noise but the door doesn t move your main drive gear is probably toast.
Drive gear bore size.
If the door is closed push the wall.
How to replace worn gears in a garage door opener preparation.
Lower the motor unit down.
Replacing a garage door opener gear is not a difficult project but does require some care and attention to detail.
Examine the white plastic gears.
The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on the motor.
If so you will.
Lay the chain out on the garage floor while you complete the repair.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
If your garage door opener runs when you press the button but the door won t open this is likely the part that needs replacing 41a2817 drive gear.
Garage door opener won t open all the way fix.
Use a step ladder to access the garage door opener s power cord and motor unit.