The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on the motor.
Garage door opener troubleshooting.
It s also possible that the circuit breaker fuse or gfci outlet powering the door opener circuit has tripped or burned.
Liftmaster garage door opener troubleshooting.
The garage door opens partially.
Close the garage door with the remote control or door control pull the emergency release cord down to disconnect the opener from the door lift the door gradually and pay attention to areas where the door sticks or binds inspect the tracks jabs or garage door rollers for any signs of damage.
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.
As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
If you garage door is lowering then reversing back to the open position there could.
If everything else is working well then it could be that the power in.
Garage door opener won t open all the way fix.
Step by step guide garage door reverses when opening or closing.
Garage door openers manufactured after 1993 include sensors to prevent a door from closing on a child or pet.
Finally it s possible the garage door opener s motor.
The wall switch doesn t work first check your fuses gfci or breaker to see if any of them have tripped broken or burnt out.