The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on the motor.
Grinding noise chain not moving on garage door.
If the gear becomes too worn it will no longer be able to move the chain.
Press the remote or the wall mounted start switch listen to the motor and watch the movement of the chain.
The main drive gear is the most common component to fail on most openers the gear alone should cost you less than 20.
If you hear a garage door grinding noise it could be the rollers.
A constant grinding noise could be a sign that your garage door opener s chain or belt is either too loose or too tight either way it needs adjusting.
The door track rollers move each time you open or close the door leading to a lot of movement and causing wear.
Squeaky garage door or garage door grinding sound when opening or closing.
If the motor hums but the chain doesn t move that indicates a problem with the motor.
This excess tension causes the gear that moves the chain to grind down.