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We have a John Deere Combine 9500. from 1996.
What is the problem when you switch to to half engine speed nothing happens? it only work on idle and full speed.
 

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Jens; There is a resistor that gets switched in when you put the switch on "half". Its the 2K from pin 5 to ground shown on the schematic. WIre 143 is the throttle control wire: Idle, its open circuit, full throttle its shorted to ground, and at 1/2 its got the 2K to ground. Note its a special switch.

I would guess that someone put the wrong switch in, or the resistor is broken.
 

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Discussion Starter #3
Jens; There is a resistor that gets switched in when you put the switch on "half". Its the 2K from pin 5 to ground shown on the schematic. WIre 143 is the throttle control wire: Idle, its open circuit, full throttle its shorted to ground, and at 1/2 its got the 2K to ground. Note its a special switch.

I would guess that someone put the wrong switch in, or the resistor is broken.
Hi Jeff.
Thank you for the information,
We will have a look at the switch.
 
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