Introduction

If your Logitech G27's shifter stops responding, you may need to replace the potentiometer inside it. The potentiometer is the electrical component that keeps track of which gear the shifter is on. The replacement isn't too difficult, you mostly just have to unscrew lots of screws.

Image 1/1:
  • Remove the six 9.0mm allen screws with a 2.5mm hex key.

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Image 1/1:
  • Either use the plastic opening tools or the screwdriver to pry and pop off the cap on the shifter.

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Image 1/2: After, remove the shifter top and shifter boot cover by pulling straight up. Image 2/2: After, remove the shifter top and shifter boot cover by pulling straight up.
  • Remove the black 12.3mm screw inside the shifter with a Phillips #1 screwdriver.

  • After, remove the shifter top and shifter boot cover by pulling straight up.

And remove the three 15.6mm screws with a Phillips #1 screwdriver.

Marco van 't Wout - Reply

Image 1/1: Pull the lower clamp up and out of the shifter assembly.
  • Flip the device over and four 15.6mm screws with a Phillips #1 screwdriver.

  • Pull the lower clamp up and out of the shifter assembly.

The screws on the far left and right are too tight! What do I do?

Ethan Fleming - Reply

This step isn't necessary.

Adam Clarke - Reply

Image 1/3: Next, unscrew the clamps by holding the lower portion of the shifter and unscrewing the top part. Image 2/3: Also remove the nut on the screw if it wasn't removed with the lower clamp. Image 3/3: Also remove the nut on the screw if it wasn't removed with the lower clamp.
  • Remove the two 10mmm hex nuts with a 10mm socket and a ratchet.

  • Next, unscrew the clamps by holding the lower portion of the shifter and unscrewing the top part.

  • Also remove the nut on the screw if it wasn't removed with the lower clamp.

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Image 1/1:
  • Remove the eight black 11.9mm screws from the bottom housing with a Phillips #1 screwdriver.

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Image 1/2: Watch out, there are 2 wires attached to the PCB board. Be careful not to damage these in any way. Image 2/2: Watch out, there are 2 wires attached to the PCB board. Be careful not to damage these in any way.
  • Carefully lift the top half of the housing from the bottom.

  • Watch out, there are 2 wires attached to the PCB board. Be careful not to damage these in any way.

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Image 1/1:
  • Carefully remove the two plastic connectors with a plastic opening tool or your hands.

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Image 1/1:
  • Go to the lower portion of the shifter; remove two black screws and four silver 15.9mm screws with a Phillips #1 screwdriver.

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Image 1/2: Squeeze the two metal plates together and slowly pull up. The assembly is spring loaded and will fall apart if it is not squeezed. Image 2/2: Squeeze the two metal plates together and slowly pull up. The assembly is spring loaded and will fall apart if it is not squeezed.
  • There is grease covering the whole shifting assembly so it will get messy when removing.

  • Squeeze the two metal plates together and slowly pull up. The assembly is spring loaded and will fall apart if it is not squeezed.

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Image 1/2: The is the hardest part of reassembling. Make sure to properly place the spring inside of the inner housing and the ball bearing on top. Place the other metal piece on top of it. Image 2/2: The is the hardest part of reassembling. Make sure to properly place the spring inside of the inner housing and the ball bearing on top. Place the other metal piece on top of it.
  • Remove the shifter assembly and place it on a flat surface. Then remove the metal plate with the spring and ball bearing attached.

  • The is the hardest part of reassembling. Make sure to properly place the spring inside of the inner housing and the ball bearing on top. Place the other metal piece on top of it.

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Image 1/3: Image 2/3: Image 3/3:
  • You will now have access to the two potentiometers on the sides of the assembly. Make sure they are properly connected and if need be, replace them by removing.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

6 other people completed this guide.

Nicholas Gholdoian

Member since: 04/21/2015

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Cal Poly, Team 15-4, Amido Spring 2015 Member of Cal Poly, Team 15-4, Amido Spring 2015

CPSU-AMIDO-S15S15G4

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10 Comments

Where can I buy replacement pots?

Riccardo Flask - Reply

Great guide, thanks a lot for the effort. It turned out that one of the cables connecting the pot to the pcb had snapped. Just going to test now.....fingers crossed. :-)

Cheers. Andy M.

Andy Mitchell - Reply

Hey did It work?

Levente Gergely -

I didn't even have to replace them. Only cleaning with electronic cleaning spray and move the pots fully was enough to fix it. However, and I think that was the real problem, one of the pots was damaged because the plastic pointer it has to be inplace in the assembly was broken. Only one half was in place. I used something here we call "type cleaner clay", some sort of clay not use to play but to fix things to the wall or clenaning old typewriters. Comonly blue. Other forums says damaged pots are not common, only dirty or may be, as mine broken. Easy to fix

Ricker Silva - Reply

Has anybody found a source for these pots? I'm guessing they're proprietary? Possibly some version of CTS 252 series? Anything they can be replaced with? I've worked on a couple of these where people opened up the shifter pots trying to clean them and damaged them, and I cannot for the life of me find any replacements and I've searched high and low through every joystick potentiometer source I could find.

David Riley - Reply

if the potentiometer is broken do the other buttons on the shifter still work?

bradhunt1 - Reply

Hey do you know where I can get these piece for spare?

Thanks

Jennifer juarez - Reply

Oh no! I do not know where to draw the spring.

valtsuhoo - Reply

Could this fix my shifter problem? First and second works fine but 3 recognises it as 1. 4th recognises as second fifth as first sixth as second and reverse is first. Could this fix it?

Levente Gergely - Reply

I had the same problem you have. I removed both pots and putted them in a cup of petrolum solvant (i used kerosene) for few minutes then put them back and the problem gone. Try to use cable tie before u bring the mechanisim out of its place so it will be easy for you to do the job.

Zeynep Cruze -

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