2005 JD 790 Starts and Idles wont Run

   / 2005 JD 790 Starts and Idles wont Run #1  

Bearcreekrockies

New member
Joined
Dec 3, 2010
Messages
3
Tractor
John Deere 790
The tractor starts and Idles fine, recently changed out all fuel and the fuel filter. Any time the tractor is put into gear or even If i turn the PTO on, raise or lower the bucket... It dies? Any suggestions?
 
   / 2005 JD 790 Starts and Idles wont Run #2  
Was the fuel and filter changed as a result of having the no-run problem?

Do you have a shut-off valve on fuel filter? On?
 
   / 2005 JD 790 Starts and Idles wont Run #3  
do you have any throttle response after you start it?
(without operating loader/shifting etc)
 
   / 2005 JD 790 Starts and Idles wont Run #4  
I had this sorta happening last winter on my 4010. Found 2 globs of wax partly plugging the fuel outlet from the tank. Fished these out, and all has been fine since.

Ralph
 
   / 2005 JD 790 Starts and Idles wont Run
  • Thread Starter
#5  
Yea the throttle responds just fine, it will idle for an hour at just about any RPM, you can hold the clutch in... no problem. As soon as you shift into gear its like you turned the key off? same when you try to engage the PTO? If i give it some throttle when i move the shifter into gear it will hold on for a bit but eventually dies? it acts as though there is some sort of safety on the transmission that sees it going into gear and shuts it off?
 
   / 2005 JD 790 Starts and Idles wont Run #6  
sounds like a bad seat switch
the tractor needs to be in neutral to start, there is a switch
there, but also for it to shift, i believe the seat switch needs
to be activated. that would explain the pto also, no seat switch
signal and once you try to engage the pto, it kills the tractor.
 
   / 2005 JD 790 Starts and Idles wont Run #7  
Agree...Maybe a switch is acting up.??
 
   / 2005 JD 790 Starts and Idles wont Run #8  
The most likely suspect is an electrical switch, fuel and/or?, the manual has a comprehensive diagnostic section, I would start there. The instructions are pretty straight forward

Keep us updated!!:D
 
   / 2005 JD 790 Starts and Idles wont Run #10  
Bear, this should help.
(different serial #'s, as far as I can tell, one has blinkers,the other don't)
 
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