Disassembling Logitech Mouse Logitech Cordless Click Mouse

It's a three button mouse with the middle button as a wheel. Note also the left side of the silver oval. That's a cover, not a switch. On the side are forward and back browser buttons. The small button on the top supposedly switches between open documents - like ALT+TAB? It's not supported on my system. Remapping is possible.

The 2nd image shows the receiver. It's quite bulky compared to newer models, but then not so easy to lose! The manual has images of more usual USB stick type receivers, so you may have one like that. I could find no obvious screws. It could be clipped or glued. It amounts to a sealed unit and was working, so the receiver got a surface clean only.

You can see the battery cover has a diagram of how to pair the mouse to the receiver. The little white button on the base is used for that. But now, remove the cover and batteries.

The first screw to undo with the screwdriver is the one in the middle of the battery holder. My model had a little crosscut in the label which gave a clue as to where the second screw was. The label may help retain this screw, so I didn't bother removing it entirely.

The two halves will now come apart. You can see the two springs on the wheel and the grey plastic of the switches. See also the two grey squares where the left and right mouse buttons hook over prongs in the blue plastic.

The two indicated silver screws hold the wheel cover on. This also covers the inner edges of the mouse buttons and holds the small top button. Remove this.

Here is the removed cover. The top switch is a single piece which includes the main body of the switch, but also a spring that spirals around it and clips onto the adjacent mounting post. There is potential to damage this delicate part, so be careful if you decide to remove it. Slide it off gently and put it some where safe.

The wheel housing also sat partly on the cover plate. Now it's gone, you can undo the three black screws securing the cover plate. It is quite hard to re-seat these upon reassembly. My tip is to fit them onto the screwdriver tip, hold the casing over them and possibly push them up into the holes.

When re-seating screws, assuming they originally self-tapped into the plastic: To avoid ruining the original thread, once the tip of the screw shaft is in the top of the hole, I gently turn the screw anti-clockwise until I feel it "drop" in a fraction to the original track of the thread. Then I gently tighten it again. Don't over-tighten either.

Squeeze the retaining clips until you can release the grey plastic. It can be fiddly. Ensure the front of the mouse buttons are clear of the front rim of the housing. You need to clear the alignment pins near the clips and slightly push forward to clear the retaining pins near the front, tilting the grey piece so it slides through the slot and out.

Shown also are the previously removed covers.

Shown is the top housing with all other parts removed - you can see the accumulated grime. A soft damp cloth with a bit of detergent should be enough to clean the parts. You could also use an old toothbrush for the seams and crevices. Logitech have advice on cleaning

Here is the grubby looking mouse wheel and the spring you press against when pressing the wheel. Note the orientation of the spring for later. The wheel assembly simply lifts out. Take care not to lose the springs. The inner wheel rim is ridged. The spring on the other side engages with these ridges, creating that "clicky" feel as the wheel turns.

The second image shows the removed assembly. The plastic part holds the wheel and the hole for the rotation spring on the left is marked. It just hooks in and presses against the inner wheel rim. You can see how the other spring is mounted in the first image. You might want to remove any muck you find under the wheel.

I suspect some of the grime was due to grease applied at manufacture. I gave the wheel a light clean, focusing on the rubbery part as I didn't replace the grease. If you do, I suggest a bit of research for a grease that won't damage the material of the wheel. I guess it's a soft plastic rather than rubber.