Logitech Mouse M525 Disassembly & Scroll Wheel Repair

Oct 24, 2026

Guide to disassembling and reassembling a Logitech M525 mouse to clean or repair the scroll wheel when it fails to work, becomes dirty, or the rubber begins to disintegrate. Covers removing the battery cover and batteries, locating hidden fixation screws, separating the lower cover and unplugging the battery connector, then removing the scroll wheel while protecting the bottom spring. Includes cleaning based on light-through sensor fins, removing degraded rubber, and step-by-step scroll wheel assembly with spring compression and reassembly in reverse order.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages7

Reading Time18 min

AccessFree to download

Introduction

Tools

Disassembly Steps

Remove battery cover and batteries

Remove fixation screws and separate covers

Remove scroll wheel

Cleaning and Reassembling the Scroll Wheel

Cleaning based on light-through mechanism

Reassembling and spring compression

Reassembly in Reverse Order

Logitech Mouse M525 Disassembly & Scroll Wheel Repair Disassemble and reassemble Logitech M525 mouse, ... Written By: Stephan 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. TOOLS: Phillips \#0 Screwdriver (1) Needle Nose Pliers (1) Paper Clip (1) Slip Joint Pliers (1) optional-vice grip or channel lock will also work. Step 1—Remove battery cover. Switch for this is on the bottom. Very findable, so no image. Step 2—Remove batteries And the Unifying receiver, if its in the mouse. This is not strictly needed, but you shold probably still do it. Step 3—Find the fixation screws 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. Step 4—Pull down the downside cover The base fastens to the upper shell with two screws at the back. The front is a friction fit. 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. Once the shell is loose, unplug the connector for the battery cable that holds the base and shell together! Alternate description: To separate the pieces hold the shell in one hand, and in the other grip the left and right edges of the base below the battery compartment. Gently pull the base down a bit, then while rocking it side to side a bit,, pull it backwards away from the shell. The second image tries to show the clutches that hold it to the upper cover. Step 5—Now you can just remove the rest, like the mouse wheel and stuff. 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 atthe front. Make sure this comes straight up/down to release. Step 6—Cleaning and reassembling the scroll wheel 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. 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. 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. Step 7—Reassembling scroll wheel assembly 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. 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. Reassembling the scroll wheel: 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. 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. I found it easiest to insert the spring at this point. Compress the spring so that it sits entirely underneath the arm. (See photos \#2-3) 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 cl

FAQs

What problems with the scroll wheel does this guide address?

It focuses on scroll wheel issues such as not working, being dirty, or having the rubber disintegrate and leave black residue.

Which tools are recommended for opening the Logitech M525?

The guide lists a Phillips #0 screwdriver, needle-nose pliers, a paper clip, and slip joint pliers (optional vice grip/channel lock also works).

How does the mouse detect scrolling after the wheel is cleaned?

The wheel registers scrolling by shining light through the clear housing, where internal fins interrupt the light to signal movement.

Oct 24, 2026

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