JD 520 Starting Issue

InNjPa

New User
I have a JD 520 tractor that I m having trouble starting. When engaging the starter, the engine fires and acts like it s going to run but as soon as I release the starter, the engine dies. Any suggestions would be greatly appreciated!
Thank you!
 
I own a John Deere 520.There is a wire that is connected from the starter (Contactor switch that is attached to the
Starer) to the coil that bypasses the ignition resister only when the starter is engaged. This allows a full 12 volts
directly to the ignition coil.

Once the engine starts and the operator removes their foot from the start pedal, then power is supplied to the ignition
Ballester resister and the power from the starter is no longer in play.

POSSIBLY you are NOT getting power from the battery to the Ballester resister???.. so, engine dies when start pedal is
released.
Check for 12 volts getting to the Ballester resister when ignition is turned on.
 
Sounds more like the resistor is bad. The old Chrysler's would do exactly as you describe when the ballast resistor went bad.
 
Sounds like a resistor to me too. I had an Allis Chalmers tractor that did the exact same thing. New resistor, problem solved.
 
Im in the camp with the other fine gents. Ifffffffffff the ballast resistor was open (or a bad connection)
when you're NOT cranking the coil wouldn't get any power. Even if it were open, however, when cranking the
coil DOES GET VOLTAGE........

Check the ballast resistor as well as all its connections, it should read around 1.5 to under 2 ohms.

John T
 
(quoted from post at 08:21:42 10/02/22) HOOK a volt meter to the batt side of the coil does the voltage quit when you release the start sw

EXCELLENT advice, gene!
 
Thank you all very much for your prompt replies with great ideas and information. I will troubleshoot per your guidance and let you know what transpires.

As a "newbie" to this forum, I m blown away with everyone s willingness to lend a hand. Thank you all very much!!
 

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