After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out.
Garage door opener gear broke off.
I want to know if it is cheaper to fix this machine or to buy a new one.
It was a perfect replacement and the garage door is working.
If the gear and sprocket assembly breaks the motor runs but the door won t move.
Report this by manage my life.
The gear on the top of the machine that cranks the chain has sheered off and is broken.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
Documenting how i repaired the garage door.
This is the part that connects the motor to the chain or belt.
And is not under warranty.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
The opener is a craftsman 1 2 h r.
This was a craftsman model 139 53976srt.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
You will need to check the internal components of your garage door opener.
It wasn t listed for the same model but after looking online it seems that most garage door openers made after 1984 use the same sprocket assembly.
Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
The bag said it was an oem piece.
You can put the chain back on your automatic garage door opener using a simple adjustment mechanism.
This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday.
One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.
How can i fix this.
My garage door opener is broken.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
Chain driven garage door openers should have some slack in the chain for optimal performance.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
