John Deere 120 throttle problems

[Ian Brady]

I have a John Deere 120 I cannot get to throttle up or down. Replaced stepping motor and throttle dial. When key is switched on the stepper motor sweeps about 1/2 inch either direction then stops. When throttle control dial is moved you can feel a slight bump in the motor but it doesn’t actually move the arm.
It seems like it may have to do a learn procedure but there is no switch that it seems people are talking about. Thanks in advance for any help.

 

[Diesel Dave]

The learn switch should be directly to the right of the fuse box panel.
If it doesn’t truly exist , the part # is 4359384 .
Looks like it might come with the small guard to prevent accidental bumping of the switch.

 

[Ian Brady]

The learn switch should be directly to the right of the fuse box panel.
If it doesn’t truly exist , the part # is 4359384 .
Looks like it might come with the small guard to prevent accidental bumping of the switch.
View attachment 274240

Well it turns out that you’re 100% correct and I couldn’t see behind the guard without my flashlight which I brought with me this am. I did a relearn and machine throttle works normal again. Thank you!

 

[thepumpguysc]

I love a story with a happy ending.!
Thanks for updating this thread.
Happy tractoring..

 

[skyking1]

Nice! I just went through a new computer install on our 120 and have been through this recently. Good going pumpguy.