Introduction

The scroll wheel on this gaming mouse has holes in it that the optical sensor uses to detect when the wheel is turning. If dirt or other foreign material covers the sensor or the holes, the scroll wheel will stop working or may only work intermittently. This guide will demonstrate how to open the mouse and take the wheel assembly apart for cleaning.

Image 1/3: Unscrew the three screws that are now visible. Image 2/3: Gently pull apart the top and bottom halves of the mouse. They will be connected by a wire. Image 3/3: Gently pull apart the top and bottom halves of the mouse. They will be connected by a wire.
  • Use a thin blade to peel up the corners and remove the mouse feet. They re-adhere very well, so be careful to not damage them or get the sticky side dirty.

  • Unscrew the three screws that are now visible.

  • Gently pull apart the top and bottom halves of the mouse. They will be connected by a wire.

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Image 1/3: Take the scroll wheel assembly apart and clean off any obvious debris. Image 2/3: Look through each of the holes in the scroll wheel to check for debris that could be obstructing the optical sensor. Use a needle to clean out any obstructions. Image 3/3: Look through each of the holes in the scroll wheel to check for debris that could be obstructing the optical sensor. Use a needle to clean out any obstructions.
  • Slide the scroll wheel up and out of the housing.

  • Take the scroll wheel assembly apart and clean off any obvious debris.

  • Look through each of the holes in the scroll wheel to check for debris that could be obstructing the optical sensor. Use a needle to clean out any obstructions.

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Image 1/2: Use a gas duster to remove any remaining dust from inside the mouse. Image 2/2: Use a gas duster to remove any remaining dust from inside the mouse.
  • Optional: If there is any material near the base of the mouse, under the scroll wheel, the sensor chip can be unscrewed and removed.

  • Use a gas duster to remove any remaining dust from inside the mouse.

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Image 1/3: If done correctly, the wheel should click while scrolling. The wheel should not spin freely. Image 2/3: Optional: Before reinserting the scroll wheel peg, apply lubricant if needed. Image 3/3: Optional: Before reinserting the scroll wheel peg, apply lubricant if needed.
  • Reassemble the scroll wheel.

  • If done correctly, the wheel should click while scrolling. The wheel should not spin freely.

  • Optional: Before reinserting the scroll wheel peg, apply lubricant if needed.

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Image 1/1: Make sure that the spring is aligned correctly.
  • Slide the scroll wheel back down into its housing.

  • Make sure that the spring is aligned correctly.

  • Place the top half of the mouse back on to the bottom half and screw the mouse together.

  • Stick the mouse feet back on to their respective locations.

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Conclusion

Plug the mouse back in to a computer and test for responsiveness. If the mouse wheel is clean but still does not function, contact Logitech support.

21 other people completed this guide.

Ben

Member since: 09/02/2014

650 Reputation

1 Guide authored

8 Comments

It worked! Thank you so much!

laurieannismorgan - Reply

got my scroll wheel back from just being intermittent. nice guide for the best mouse ever made. All hail the mighty MX518, shotter of many heads, destroyer of Skyrim, Diablo I,II,III and lately bearer of the Witchers mighty blades. HAIL HAIL HAIL MX518!!!

aer0squid - Reply

My mouse went from scrolling just fine to nothing overnight. This helped a lot, but sadly its still not 100%. :(

Jimmy Kupczak -

Worked like a charm. Thanks. I really like this mouse and didn't want to have to get used to another one.

Charles Mercer - Reply

Fantastic!!! I've been really reluctant to replace my MX510 mouse -- your teardown of this one (which the internals appear to be identical anyway) was perfect!

My mouse is running like brand new again!

Raymond Morgan - Reply

Immensely helpful, probably wouldn't have been able to put the mouse back together without this

Dresius - Reply

Great guide! Scrolling was "skipping" on my MX518 after 7 years of use and these instructions helped me reassemble after I cleaned untold amounts of lint and debris from inside. Would have probably given up on the finicky scroll wheel mechanism and discarded a perfectly good mouse if not for this guide...

chstamos - Reply

Same problem here, but i had to change a 150ohm Resistor as well (0805 package). As crazy as it sounds it was cracked and the wheel was completely dead, that's what happens with a +10 year old mouse i guess, all sorts of weird things can occur. Oh and you can salvage parts from certain older Logitech ball mice like micro-switches and wheel mechanism, internally it's the same design !

Seb - Reply

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