MTH Z4000 Throttle Making Contact

You'll have to take the cover off and adjust the potentiometer bracket that engages the gear on the handle. There are 7 3mm hex screws on the bottom and the top lifts right off but only so far as there are cables connecting the circuit boards in the top to the ones on the bottom 

Thank you Matt.  That was a big help in getting the cover off.  This is a picture of the gears.  It seems the smaller one is not in proper alignment as the one on the right handle is.  I don't see an adjustment but maybe I'm missing it.  Would silicone lubricant help here do you think?

There is also more play in the left handle vs. the right handle if I gently rock them back and forth.

The metal bracket gets bent then the teeth don't mesh together. You can take the POT off the bracket or just the gear off the POT and bend it back. If you over bend it a bit then it will keep tension on the gear. I had to do it to one of mine, I don't remember how I did it but it worked great

Thank you again Matt.  Can you tell me how you removed the gear from the POT or the POT from the bracket?  I don't want to break anything!

I too have this issue with my Z-4000.  I posted several weeks back asking for advice and had no reply, so thanks Matt for your good information and thanks KAI for the post.  Matt (or any forum member) is there a way you can post KAI's picture and insert a pointer as to where the POT is and how it is removed to correct?  I haven't opened mine up yet, but would like to have a good idea of what I should be looking for to when I do.  Thanks again.

I posted pictures a few years ago.  I am trying to locate them. OK. Found them.

Fantastic!  Thanks Don!

-Rob

Does it make the noise with the cover off ?

It makes the sound with the cover on or off.

I found the problem to be a bent POT and a smaller gear that did not turn true.  I ordered the parts from MTH and installed them today.  The rubbing and screech noise are now gone.

Thank you all for your help.

Great, glad it worked out.

KAI,

   Congrats on a great job, and fine repair work!  This is just another example of how the OGR benefits the board members, ya got to love this forum!

PCRR/Dave