Ensure proper installation. Ensure gears in main control head box are not worn out, The main drive flat gear is plastic in a lot of these openers. Replace main gear unit are rebuild it.
SOURCE: motor hums but door will not open
Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.
SOURCE: How do I tighten sagging garage door chain?
I think you have more problems than just a sagging chain. It is most likely sagging because the bronze bushing at the gear and sprocket assembly is bad. It lets the sprocket lean forward and loosens the chain. You will also need to remove the cover from the motor unit and check the drive gear. It is a white gear just in front of the motor and is most likely stripped.
SOURCE: My Liftmaster GDO makes a clicking sound and won't open
See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.
SOURCE: my garage door opener (liftmaster 1265) buzzes
Remove the cover from the motor unit and check the drive gear. It is white nylon and is just in front of the motor. Most likely stripped.
Testimonial: "Don0930 - Yes, gear is stripped. Will be purchasing replacement gear instead of new unit. Thx!"
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