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Reddit mentions of Genie 34107R.S Screw Drive Carriage
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Reddit mentions: 2
We found 2 Reddit mentions of Genie 34107R.S Screw Drive Carriage. Here are the top ones.
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Genuine Genie screw drive carriageReplaces part numbers 25589R, 20073R, 18656R, 20414R, 24357R and 34107R
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I'd place money on this being the problem --http://www.amazon.com/Genie-34107R-S-Screw-Drive-Carriage/dp/B000CST1L4/ref=sr_1_10?ie=UTF8&qid=1373510076&sr=8-10&keywords=garage+door+trolley. Teeth get stripped rather easily.
But if it's a rental, that's the landlord's problem.
Had something similar happen to a Genie screw drive I had a few years ago.
This may or may not be the same problem with yours, but if it's grinding, it sounds like it is the same thing.
The black plastic thing that slides in the track of the opener, has teeth on top of it that engage the screw. When you pull the rope that pulls the lever down, that disengages those teeth. That plastic thing is called the carriage. If it's grinding, then the teeth have probably broken off or worn down and are just grinding away because there's not enough teeth left to engage the screw.
Here's what one looks like:
https://www.amazon.com/Genie-34107R-S-Screw-Drive-Carriage/dp/B000CST1L4/
You can see the teeth on the top part sticking up. That's what raises and lowers with the engage/disengage lever/rope.
You'll have to take it off to make sure that's what it is. There are several youtube videos showing how to remove/replace the carriage.
Then make sure you get the right part number for your particular model # opener, before ordering a new one.