Starter Solenoid for 4Cyl Diesel 4140 Industrial

wfboquist

New User
Location
IL/MI
Hello all. My pre-1965 4000 series (4140) diesel tractor needed a new starter solenoid. I went to a couple of places to buy one, and they both had solenoids that were identical in appearance to the old one. However, on backs of the packages, they were labeled as being made for tractors made in 1965 and later. I bought one and installed it, because they had nothing else. The new solenoid did nothing when wired in as the old one was. Thinking I might have somehow crossed the small-gauge wires that are pushed on to the two lugs, I reversed them and turned the ignition key again. Not only did the solenoid operate, but the engine started to turn over, even though I had not yet touched the starter button on the transmission. The tractor then started, and I had to turn the ignition key to the "off" position to disengage the starter. As expected, the engine continued to run until I throttled it all the way down. I could use it this way, but I recognize that there is an element of danger in having the starter button on the transmission bypassed, as it is now. I would like to have the starter button back in the loop.

My question: Do I have the right solenoid, wired wrong, or do I have the wrong solenoid?
 
This is what I list for pre-1965. Do you have the original OEM#?


 
The push button on the transmission completes the path to ground. If the starter spins without pushing the button, then it is not the correct solenoid. It needs to be an "isolated primary" solenoid, meaning that neither end of the primary winding inside is grounded to the case of the solenoid.
 
Thanks. Based on the info you provided and the description of the unit in the first reply to my post (which I have now ordered), I hope I will be set when it arrives.
 

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