If the gears have screwed up teeth you can likely just replace them to solve the problem.
How to fix a garage door opener gear.
Silicone spray is a good choice.
If you have a screw drive opener you ll need to grease several spots along the rail gear at least once or twice a year.
Pull the chain off the motor unit sprocket and out of the chain spreader.
If not your opener might simply be shot and you ll need a new one.
With the gears back in place tighten the chain as directed in your owner s manual.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.
Test your repair with the garage door disconnected from the opener trolley.
Then install the helical gear assembly.
Remove retaining screws from the cover.
Required tools for this project.
Reattach the chain and tighten it to the proper tension see your owner s manual.
Shine the flashlight directly at the gear set.
Slide the outer trolley away from the inner trolley.
Use a lubricant that doesn t attract dirt.
Lay the chain on the garage floor while you complete the repair.
Coat the gear teeth with new grease.
Start by unplugging the motor.