There are a host of problems within the motor unit that might need fixing therefore look for your needed solution below.
How to change garage door motor.
Go with 1 2 hp for a double door and 3 4 hp for a door that has a wood or faux wood overlay they can be heavy.
When buying a garage door opener choose a 1 3 hp or 1 2 hp garage door opener for a single garage door 1 3 hp can be hard to find at some home centers.
Connect the lifting arm from the door to the track.
Screw the new motor into the existing brackets in the ceiling using the wrench.
The motor gear is a white toothed wheel which is mounted on a long metallic piece called the sprocket shaft.
Choose the right garage door opener.
The garage door opener motor is an electrical device that opens and shuts a garage door without having to manually pull it down or push it up fixing motor problems may not necessarily mean disassembling it and can be addressed by certain external adjustments.
If no one is available to help a clamp can be put on the track at the end of the door image 1.
Wire the keypad into the wall on the inside of the garage.
Garage doors weigh 150 pounds or more and if the door were not locked in place there would need to be some way of holding it up until it can be lower manually.