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I had a similar problem with a Craftsman opener. There are 2 gears that are in the housing, these are made of nylon/plastic and are built to wear out over time. My model was 139.53664SRT , the gear kit is 41A2817 and you can order the entire thing from Sears.com. If you get the housing off you can see if you just need one of the gears, either the drive gear or worm gear , you can order those off of ebay pretty cheaply. You'll need screwdrivers and probably some wrenches to get things apart and install the new gears, you'll also need to use lithium grease on the gears, that keeps the gears from eating each other up too quickly.
DOES THE DOOR WORK SMOOTHLY AND EASILY MANUALLY??
IF NOT THAT WILL CHEW UP YOUR GEARS.
IF THE DOOR WORKS WELL MANUALLY I AM GUESSING YOU ONLY REPLACED THE EASY GEAR.
YOU NEED TO REPLACE *BOTH* GEARS - FOLLOW THE INSTUCTIONS COMPLETELY. THE SECOND ONE IS HARD TO CHANGE BUT IF YOU DON'T THE ROUGH SURFACE OF THE HARDER WORN GEAR WILL CHEW AT THE NEW GEAR AND ..... WELL YOU HAVE SEEN THE RESULTS.
HOPE THIS HELPS
vheuser1 is right. I ordered the gear kit (41A2817) for ~$30. Mind you, I only changed one stripped gear so the job was very easy with the right tools, nothing special. Many of my neighbors are having the same problem since our houses were built at the same time but they chose to call in repairmen. Don't forget to adjust the 4 speed and limit settings once you're done. This was also a good opportunity for me to adjust the slack in my chain since it was hanging too low.
It sounds like you did a really good job! My Craftsman 1/2 hp gar. dr. opener has a red reset button on it on the l/h side as you are looking at the light/motor from the garage door opening. You have to take the light cover off to be able to see it. My reset button is on the same side as the ground wire. You might check the ground wire while you're there. I really hope that this fixes it for you (and me). I'm quite sure it will as you know your way around the garage door opener already. Good Luck and Let me Know (Please) if it fixed it or not. If I think of anything else, I'll let you know. Have a Good Day!
I have a 1265 and took the cover off (unplug first).
There are screws securing the cover: 2 on each side at top, 2 at either end bottom.
Then I disconnected the chain.
There are 3 hex head screws securing the drive gear assembly (of course they thread from the inside out which makes taking them out a bit time consuming). Take care not to damage the circuit board or other electronic connections.
Then at the bottom of the shaft is the "limit switch assembly" that is clipped into the metal housing. Squeeze the 2 on the outside and it should swing free.
Then at the very end of the shaft there is another plastic gear. It is secured by a 3 prong plastic clip. Pull the outside clips away from the shaft while pushing the center piece back through the shaft. The gear should come off and you can now remove the gear and sprocket assembly up through the assembly.
call 800 528 2817 and order the "Gear and Sprocket Assembly".
I am waiting for the part and assume we reverse the order above to reinstall.