# Sprocket on Y-axis came out
**URL:** https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905
**Category:** Troubleshooting (X35/X50)
**Created:** [April 8, 2021, 9:38pm UTC](https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905 "2021-04-08T21:38:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@DMHamm](https://forum.onefinitycnc.com/u/DMHamm)
#### Post date: [April 8, 2021, 9:38pm UTC](https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905/1 "2021-04-08T21:38:29Z")
The sprocket on one of my Y-axis rail assemblies has come loose. Not sure how it is supposed to be held in, but I’m certain it needs put back in. Anyone else have this issue?
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### Author:  [@TMToronto](https://forum.onefinitycnc.com/u/TMToronto)
#### Post date: [April 8, 2021, 10:50pm UTC](https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905/2 "2021-04-08T22:50:30Z")
> [@Wiper Comes Loose (White plastic ring on ball screw)](https://forum.onefinitycnc.com/t/wiper-comes-loose-white-plastic-ring-on-ball-screw/3687):
>
> It’s a pretty easy fix, a set screw (or two) must have just come loose a bit. We’ve attached a picture showing one side of the gold/bronze piece (the ball screw) out of the block (remove the two hex bolts from the bronze piece holding it to the black metal block. Once you remove those, slide the block back and the ball screw will come out. you’ll notice (from the picture i attached) there’s two small holes on the sides of the circle part. They are set screws. Back them out a bit, then push …
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### Author:  [@DMHamm](https://forum.onefinitycnc.com/u/DMHamm)
#### Post date: [April 9, 2021, 12:18am UTC](https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905/3 "2021-04-09T00:18:48Z")
Hmm… From what I can see, it looks like they have backed out completely. As in: not there at all. Rats. I will call Support tomorrow and see if they can either send me some replacement screws or let me know where I can find them.
Thank you for the response! Very helpful.
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### Author:  [@Dr-Al](https://forum.onefinitycnc.com/u/Dr-Al)
#### Post date: [April 9, 2021, 7:38pm UTC](https://forum.onefinitycnc.com/t/sprocket-on-y-axis-came-out/4905/4 "2021-04-09T19:38:25Z")
That looks like a wiper to keep dust from getting into the bearings. I don’t have my 1F yet so I can’t comment on what keeps it in place. I did a quick search to see if there’s an image and this came up.
[https://forum.onefinitycnc.com/t/wiper-comes-loose-white-plastic-ring-on-ball-screw/3687](https://forum.onefinitycnc.com/t/wiper-comes-loose-white-plastic-ring-on-ball-screw/3687)