The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on the motor.
Garage door having trouble opening.
This page should help you troubleshoot your garage door problems.
Two possible problems can lead to a garage door reversing before it even touches the floor.
If you ve checked the door springs and the track for obstacles and those things appear to be fine check to see if the lock on the door is engaged.
To reconnect the garage door to your liftmaster garage door opener manually close the garage door pull the emergency release handle down.
A number of issues could be to blame for your garage door not opening.
Check garage door for binding.
Garage door openers manufactured after 1993 include sensors to prevent a door from closing on a child or pet.
Check for interference from adjacent photo eye sensors of any brand.
These are heavy duty springs that do all of the hard work when opening your door.
If you garage door is lowering then reversing back to the open position there could.
Door starts down then stops before it is closed.
While many problems that keep the door from opening are caused by broken springs a lot of other parts could be keeping your door from functioning properly.
These steps should fix.
One of the more difficult problems for do it yourselfers to diagnose is a worn cable pulley on an extension spring door.
Garage door openers have an adjustment screw that controls the closing force the pressure with which a door is allowed to descend before the motor switches off when the door reverses before it even hits the floor this is often because the close force.
Now press the remote control.
Your garage door opener stopped operating as it should.
If your garage door doesn t open but the opener motor runs for just a few seconds and then shuts off the garage door itself may have manually been locked.
Press and hold the wall console button until the garage door is completey closed.
Garage door reverses before hitting the floor.
If an operational problem exists and the garage door opener will not close the opener can be forced to close.
This will cause the trolley to move into position and reconnect to the garage door.
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.
In my article about garage door opener troubleshooting i help you to correct the most common problems without having to consult either your owner s manual or an expensive professional.
Garage door opener won t open all the way fix.
If your door will not open and you re confident that the motor and the transmitters are functioning correctly there s a good chance you have a problem with your garage door torsion springs.