A new garage door open start around 130 00 plus installation.
Garage door gear broke off.
The gear will cost about 50 00 with shipping and then the cost of having someone install it.
Position a work table near the area under your motor unit to hold the garage door opener.
It will usually run about 200 00 total.
Place a stepladder near the motor and unplug the power cord for the motor from the electrical.
If you have any doubts seek professional help so that it does not cause the door to crash down potentially injuring someone.
Pull down the trolley cord to release the trolley from the chain arm and lower the door by hand.
Remove the chain and cable assembly.
The plastic gear on the drive shaft is designed to fail if the garage door gets stuck in the travel tracks protecting the expensive drive motor from damage.
Reconnect the door to the opener and reconnect to the power.
When you re sure remove the vice grips and manually open and close the door to check it is running smoothly.
Use a step ladder to access the garage door opener s power cord and motor unit.
This can be easily replaced by a garage door service technician.
This is the part that connects the motor to the chain or belt.
After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out.
Craftsman chain drive garage door opener make noise and the gear sprocket about to break.
One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.
Replace the garage door opener gear and sprocket assembly as the drive shaft and sprocket rotate they drive the trolley that lifts and lowers the garage door.
I hope this will help.
The gear and sprocket assembly is inside the cover of the garage door opener motor.