This video from Sears PartsDirect shows how to replace the gear and sprocket assembly on a chain-drive garage door opener. The gear and sprocket assembly drives the chain that moves the trolley along the rail to raise and lower the garage door. A broken gear and sprocket assembly won’t move the chain to raise and lower the door when the drive motor runs. Replace the gear and sprocket assembly if it’s broken.
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The video includes these parts and tools. Look up your model to make sure you get the right parts for your garage door opener.
Gear and sprocket assembly
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I have a Chamberlain Liftmaster 3575 and this video helped, though there are some extra parts to deal with in my opener. I replaced the gear without taking the opener down… fixed with the opener still attached to the ceiling. Only had to endure some shoulder burn while holding up and aligning the motor to reinstall with one arm while trying to thread the screw in with the other.
This insructional video worked very well for me. I recommend leaving the garage door operator on top of a ladder, instead of moving it to the work bench, once detached, so the bar is still near parallel with it's original position. This will decrease the torque on the fastener ring and pin. Also, the unit is fairly heavy, so make sure you have a good grip or another person to support you if needed.
2:47 If you don't do this, you'll be starting over in 3 months. I'm pretty sure this is what just happened to me (> . <)
Single woman here who's a bit of a handyma'm. I can see that this might not be super easy, but it seems like something I might be able to do w/o too much difficulty. Maybe I'll give it a shot. I need to have someone around to assist if necessary, maybe.
I'm not sure who would downvote this video–I repaired by Mom's opener in a little over an hour with the help of the video.
Must’ve de-energized the wrong breaker since the receptacle was able to illuminate the light before re-energizing the circuit breaker.
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