I've found my Fulcrum yoke to be the best sim accessory I've purchased so far.

But...yesterday I plugged it in and discovered it has developed a fault.

The elevator axis performs flawlessly still, but the aileron axis has developed a problem.

What doesnt work...

anti-clockwise motion from 12 o'clock centred to full deflection barely registers.

What works...

Clockwise motion from 12 o clock centred to full deflection works perfectly.  Return to centre works fine.

Returning the yoke from full anti-clockwise deflection to centre IS recognised and consequently the sim yoke then is misaligned with the physical Fulcrum control as the physical yoke is centred while the sim yoke is at full right hand deflection.

 

Obviously this means the yoke is unusable for flying in its current condition.

User analysis...

I've removed the cover and checked all the wiring connections - nothing seems to be out of sorts there.

The nature of the problem, being essentially that left hand deflection from centre isnt working, seems to me to indicate a hardware failure of some sort?

Wonder if you can help please @tutmeister??

Thanks K

Edited July 14, 2025Jul 14 by kevinfirth

Hope you get the help you need. You may want to clarify which direction is affected as you mentioned the same one twice - one will just be clockwise. Certainly sounds like the contactless sensor isn't registering properly in one direction.

1 minute ago, Donka said:

Hope you get the help you need. You may want to clarify which direction is affected as you mentioned the same one twice - one will just be clockwise. Certainly sounds like the contactless sensor isn't registering properly in one direction.

Corrected thanks!

6 hours ago, kevinfirth said:

Returning the yoke from full anti-clockwise deflection to centre IS recognised and consequently the sim yoke then is misaligned with the physical Fulcrum control as the physical yoke is centred while the sim yoke is at full right hand deflection.

What I would check first is the mechanical linkage between the tube and the roll sensor shaft. It sounds like the sensor shaft is slipping slightly against the tube's back plug so that the tube rotation is not translated to the sensor within a 90 degrees range from the center to a full anti-clockwise position. This would provide exactly the symptoms that you are describing.

This applies to the first  version of the yoke with TT6120 sensors (the black ones as on my photos). 

1 hour ago, SergeyPe said:

mechanical linkage between the tube and the roll sensor shaft. It sounds like the sensor shaft is slipping slightly against the tube's back plug so that the tube rotation is not translated to the sensor

I'm.nit sure exactly what I'm looking for on your images sorry, can you highlight the relevant bit please?

Im happy to have a look but would prefer to understand exactly what the sensor shaft is and looks like before messing with it! 🤣

28 minutes ago, kevinfirth said:

I'm.nit sure exactly what I'm looking for on your images sorry, can you highlight the relevant bit please?

Sure, done in the same Mega folder. Unfortunately I've replaced the stock sensors for the different ones already some time ago, so the close-up pictures of the original design are not available. However the new sensors have a similar design so I've added another picture where the sensor shaft/ back plug linkage is visible. Please note some copper foil I had to wrap around the sensor shaft to ensure the snug fit.

Check that there is no slippage of the sensor shaft against the back plug when the yoke handle is rotated. Make a mark somewhere on the sensor shaft to simplify the task.

It might also happen that the sensor itself is not fixed firmly to the mounting bracket with a nut so that the sensor body is rotating against the bracket (which seems a bit less likely).

Mine were clearly different sensors.

I removed the large metal bracket held by the 2 large torqs screws.  It looked like the back plug had indeed slipped and moved out of it optimum position.

I repositioned it and replaced the bracket.

The control movement has returned about 80% to normal, so I've clearly just got to play around with it a little more to get it back where it needs to be.  At least it looks now as though its not a sensor failure but a mispositioned backplug. 😄

Thanks @SergeyPe for your exceedingly helpful insight and very useful images that put me in a position to fix it.  

2 minutes ago, kevinfirth said:

The control movement has returned about 80% to normal, so I've clearly just got to play around with it a little more to get it back where it needs to be.  At least it looks now as though its not a sensor failure but a mispositioned backplug.

Great! The symptoms you've described were clearly pointing to a mechanical slippage; I'm happy to be able to help 😀. As for the sensor difference- I have one of the early yoke designs and based on the discussions with Chris I know that he made quite a number of changes in later versions, including the sensor types.