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Discussion Starter #1 (Edited)
Hi, I'm new to the forum so forgive me if I'm doing this wrong.
My JD 4250 tractor {thread incorrectly says 4950} is having an issue with the starter. It starts fine but when I pull the fuel kill cable, it becomes apparent that the starter has never disengaged and is still trying to turn the engine over. The only way I can kill the engine is if I disconnect the battery cables and then pull the fuel kill cable.
I've tried fully charging both batteries and also changed out the starter relay and the starter solenoid, but it still does the same thing. I checked the key switch to the relay and it is working correctly, test light lights when the key is turned and test light goes out when the key is released. My next guess is that something inside the starter is shorted and keeps the starter turning over.
Does anyone have some input or experience with this issue?? Any help is much appreciated.
 

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Welcome to GTT
If starter solenoid exciter(engagement) wire has no voltage after engine starts then if it was my tractor I'd probably install a new aftermarket starter for less than $300 & hopefully call it done. Another possibility is have old starter checked by a starter repair person.
 

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I would think the new starter solenoid would have solved the problem. Have you "bench" tested the starter to comfirm it continues to run when voltage to the trigger terminal of the solenoid is removed?
 
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Discussion Starter #4
Thanks for the suggestions guys. To answer your question, I thought that it would be as simple as replacing the relay or solenoid. I saw how difficult it is to remove that rear nut. In all my years of working on these tractors, I've never thought that it would be internal to the starter motor. I guess I'm not familiar with this type of design using an exciter wire since it turns over fine.
I have ordered the wrench that will allow me to get it off and I will try your suggestion and get it bench tested. Thanks again and I'll let you know what happens.
 

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What I referred to as the ""exciter wire"" is simply the wiring connection that goes from key switch to neutral start switch to starter relay to "S" terminal on starter solenoid. This type wiring connection has been utilized for many years to engage starters.
 

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Discussion Starter #6
Hi TX Jim, I thought you were referring to the wire that goes from the exciter terminal on the solenoid down to a lug on the side of the starter housing. I've not seen this wire on other starters before. usually there is a wire from the relay down to the solenoid exciter lug. (if you can follow me)
 

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Discussion Starter #7 (Edited)
This starter not only has a wire from the relay to the solenoid but it also has a short jumper wire that goes from the solenoid around to a lug on the back side of the starter housing near the block of the engine. I think you can make it out in the picture of the starter above. Anyway, ill rip it out and get it tested!
 

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Discussion Starter #8
Ok, I had the starter checked out by a shop that rebuilds them. They bench tested it and it did the same thing it was doing on the tractor. He disassembled it and found internal problems and also replaced the solenoid that I had replaced. Now it works fine. So I still dont know exactly what was the original cause, but to save trouble in the future, a new starter is the way to go!!
Thanks for all your help!
 
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