When the opener is activated the screw rotates causing the nut to move until it reaches the switch.
Garage door opener motor direction.
The first line of defense is the opener motor which senses resistance and reverses direction if a certain level of resistance is achieved.
Craftsman garage door opener does not reverse direction.
If an excessive amount of pressure is required to cause the door opener to reverse the reversing mechanism is considered inoperative.
I have a 1 2 hp craftsman garage door opener that is about 20 years old.
This video may help you fix your garage door opener if it tends to stop after 6 8 of travel and or when it travels too far and jams on the motor housing or.
As the motor cannot determine where it is within it s limits without it.
Garage door only travels a little way and then reverses does your garage door only travel a little way 6 inches or so and then reverse.
The motor is trying to work but something is binding.
If the bottom plastic piece on the gear was not put on it will only move in one direction.
Open up the case and look for a screw type track that moves when the opener runs.
Sometimes the limit switch is activated by the movement of a specially shaped nut traveling on this track.
Could be wiring or bad sensors if that doesn t fix it since your new gear was put in.
Motor unit assembly parts rail assembly parts and installation parts for chamberlain belt drive garage door opener models b550 b550c b552 b552c liftmaster 8550 8550w 8550wl 8550wlb repair parts list and diagrams.
Recently the wall switch that powers opening and closing is not lit and will not activate the opener.
Important safety feature 1.
A humming noise typically means that the opener is stuck or the door is stuck binding.
It went up ok but does not return down.
Answered by a verified home improvement expert.