Introduction
Disassemble and reassemble Logitech M525 mouse, with additional instructions to clean/repair the scroll wheel when it is not working, dirty, or the rubber is disintegrating.
What you need
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And the Unifying receiver, if its in the mouse. This is not strictly needed, but you shold probably still do it.
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They are hidden below the two glide pads on the sides of the release switch for the battery cover. Just stick your Phillips in there and get them out.
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It will resist a little, gently pull. When you have a little gap, gently rock it for- and backward a little, until it gets loose.
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The second image tries to show the clutches that hold it to the upper cover.
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To remove the scroll wheel, pull straight upwards, taking care the spring on the bottom stays intact. There is a plastic guide on the front of the clear housing that sits between the two plastic posts at the front. Make sure this comes straight up/down to release.
Excellent. Wheel quit working. Full of lint, dust, wrapped around axle. I could remove the wheel and unwrap the junk. Now working like new! Thanks a bunch.
This was really helpful, I was able to fix my left clicker. Thank you!
Thank you, was helpful, BUT: on the M505 there are 4 screws to loosen!!
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On my mouse, the rubber on the scroll wheel started to disentegrate. (No photos) but basically, touching the rubber would leave a black streak on your finger. The inside of the plastic housing was also black.
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In addition to other debris, this caused the scroll wheel to stop working entirely, because the wheel registers scrolling by shining light through the clear housing through to the other side. You'll notice there are "fins" inside the wheel; the interruption of the light by these fins is how the mouse registers scrolling.
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By placing a little outward tension on the center spoke, you can remove the wheel to clean the housing. Be careful not to lose the arm and the spring at the rear of this assembly.
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In my case, the rubber/glue was so disintegrated that the "tire" / wheel cover would not stay centered and kept leaving marks. So I just got rid of it. You could place a thin strip of duct tape or something else if you wanted a cover, but there's no real need for it.
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I decided to photograph this after I had reassembled it. I would recommend you do this assembly before placing the scroll wheel back onto the logic board.
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With the recess pointing to the left mouse button, line up one of the hubs and push the other side until both center hubs lock in place.
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Then, place the haptic feedback arm in place by inserting it into the recess, and lining up the left of the two locking clips at the rear of the plastic housing and clipping it in place. Leave the right side unclipped at this point.
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I found it easiest to insert the spring at this point.
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Compress the spring so that it sits entirely underneath the arm. (See photos #2-3)
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After a few tries, I was successful by compressing it with a paper clip, prepared as shown in the next step. But anything will do the job. The important thing is that it's small enough to allow the right side to click into place while the spring is compressed so the arm sits entirely above the spring.
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Prepare the paper clip spring compressor (optional) by unbending the end of a paper clip 90º.
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With needle-nose pliers, grab about 1/8" (red) of the end in your dominant hand. Further below, use channel lock or vice grip pliers (with a wider face) to stabilize (blue).
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Holding the channel lock (blue) pliers in place, bend the end in half (90º) and then in half again. Then, use the flat part of the needle-nose pliers to compress this fold unto a tight U-bend.
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As shown in the second photo (but prior to reinstalling the housing to the logic board to avoid damaging), compress the spring with the left side of the arm clipped in place, but the right side not yet clipped in. Once the spring is compressed, the paper clip is thin enough that you can click the other side of the arm into place.
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The small bend in the arm must sit entirely on top of the spring.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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16 Comments
Clear and concise, very helpful ! My wheel click didn't work anymore, a quick dusting and cleaning of the insides got it back to normal.
To those who would like to take the logics board from the lower casing : be careful when puting it back together, as the on/off switch under the board must properly align with the small moving plastic piece located in the lower casing. Otherwise, you might have to disasemble the whole thing again just to put it right.
Very helpful! my problem was the Rubber of the wheel, it has “expanded” and it made some friction with the transparent structure. Disassembled, rolled on a flat surface pressing hard and the rubber no longer touches the plastic! Awesome!
Thanks! I’ve managed to clean one of the mouse buttons, so it saved me from buying a new one.
Excellent, many thanks for the guide. I was able to clean my mouse and it’s good for another year or so.
This was perfect. I had a little bit of fluff in the hamster wheel that would only let me scroll up. I took the mouse apart and cleaned it out with some forced air. I can now scroll down!!!!
Thanks.
Thanks for this! You gave me enough info to figure out what’s wrong with my mouse: dirt on & around the mouse wheel, which can be seen by shining a light at the wheel and using a magnifying glass.
To remove the dust/lint, without disassembly:
1. Open the cover & remove remove batteries as shown above.
2. Tear & fold a piece of paper (real paper, not tissue), soak with alcohol, and insert on each side of the wheel. Jiggle the paper while turning the wheel to dislodge the dust/lint.
3. Use a vacuum cleaner hose (ideally, using crevice tool attachment to concentrate the vacuuming) to vacuum out the lint.
4. Repeat 2 & 3 a few times.
5. Install new batteries, close the mouse cover, and use your fully functioning mouse!!
The rubber on wheel had displaced. I fixed it due to this guide and now it’s ok again! Without the guide the mouse would have been scrap. Thanks indeed!
Fault in PCB because of a battery leak, everything except scroll is working fine.
Can anyone help me to how to resolve the scroll issue?
I can repair it if I have a circuit diagram because all components seem working, the issue is because of PCB track is damaged.
Thanks a lot. I had purchased a second M525 because my scroll wheel did not scroll up but kept the old one. This guide helped me get the fuzz ball out of the scroll wheel which fixed the scrolling issue letting me use the mouse for a different PC.
