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John Deere Tractors Discussion Forum
Show Parts for Model:

3020 gas dies after key is let go.

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Montana3020

04-01-2008 18:12:34
69.145.152.7



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I have a 3020 gas and have been replacing the wiring. I have put a new key switch and all new wire. I have converted this 3020 to a negative ground 12V with a alternator and electronic ignition. I have everything in place and finally have spark to the plugs. I had an electronic ignition in but I believe I burnt it up so I put the points back in and I got spark. My question now why wont it start. I put a little starting fluid in and she started up until I let the key go. As soon as I did she died. I tried it a couple of times and it did the same thing. Any ideas of what is causing it to shut down at start up?

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powertech84

04-03-2008 16:52:16
76.230.208.21



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-01-2008 18:12:34  
i had this happen once. i think i had the wires on the starter hooded up backwards. its hard to remember for sure, that was in my early days of wrenching.



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Montana3020

04-02-2008 07:55:32
69.145.152.7



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-01-2008 18:12:34  

Here is the complete diagram I am using. I have a alternator instead of a generator, a 12V flame thrower coil, points in the distributor. The system is now a 12V negative ground. Would a bad oil pressure or neutral switch cause it to shut down at start up?



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Gerald J.

04-02-2008 09:42:22
4.254.69.28



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-02-2008 07:55:32  
The oil pressure switch only runs the oil light. Has no effect on starting or ignition.

The transmission switch only affects the starter solenoid circuit.

The S terminal on the solenoid goes to the coil side of the ignition resistor. The coil should be 6 volts not 12. The resistor cuts the voltage down, but the S terminal on the solenoid applies full battery voltage while cranking (which may be 9 or 10 volts when its really cold) for better ignition while starting. The coil is also supplied through the resistor from the ignition switch. That circuit is missing if it stops when you release the start button or start position (different vintages are different, some have a separate button, some start on the ignition switch).

It doesn't matter which end of the wire between the coil and the resistor that the wire from terminal S connects to. My 4020 has a ceramic resistor mounted next to the coil so that wire is short.

Gerald J.

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Montana3020

04-02-2008 07:44:13
69.145.152.7



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-01-2008 18:12:34  

Thank you all for helping,
The ignition switch does have a resistor. Here is the diagram I am using. What terminals go to the coil and the S terminal on the starter solenoid or does the S terminal go directly to the coil? Which one goes to the carb. and the distributor. Where does the neutral switch connect to? The coil I have is 12V flame thrower 3 OHM. I think it has an internal resistor, will this be to much resistance if there are resistors on the switch and one inside the coil?

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Gerald J.

04-01-2008 20:28:12
4.254.66.12



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-01-2008 18:12:34  
You've left out a couple wires. You need ignition power to the carburetor and to the ignition resistor. Then a wire from the resistor to the coil. That's the run circuit that is missing. You also have a wire (that's present) from the S terminal on the starter solenoid to the coil. You need a complete wiring diagram which you can get from the parts book for the tractor now on the computer at your Deere dealer. It may be accessible on line too.

The coil is 6 volts and runs with a series resistor but the S terminal on the starter solenoid shorts out the resistor for better ignition while cranking.

The solenoid on the carburetor needs power to open and feed fuel for running. Its there to prevent the engine from running on after the ignition is turned off.

Gerald J.

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DanL-Colorado B36320

04-01-2008 18:21:54
72.19.183.36



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 Re: 3020 gas dies after key is let go. in reply to Montana3020, 04-01-2008 18:12:34  
Does it have a ballast resistor? If so, it may be there, or it may be in the "RUN" side of your key switch. (Some systems bypass the resistor during cranking to get a hotter spark, then when you let go of the key, the resistor cuts the voltage down to save the points and coil.)



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ccjersey

04-01-2008 19:17:47
67.33.230.65



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 Re: 3020 gas dies after key is let go. in reply to DanL-Colorado B36320, 04-01-2008 18:21:54  
I believe the ballast resister was on the back of the ignition switch (look for a cylindrical wire wound resister between two terminals) It could also be a ceramic device down on the side of the distributer. If the resister is open or the circuit from it to the points isn't good, then the only time it will fire the plugs will be while the starter solenoid ignition terminal is supplying full 12 volts during cranking.

Also may have to adjust the points a bit if the voltage drop across the resister makes the spark too weak once you release the starter.

What have you got the sparkplugs gapped at? Might be over 0.020 which is about all the one we have wants to fire across.

Over the years we have battled with a LPG 3020 and finally have gotten a high voltage aftermarket coil that seems to be doing the job. Before that we had bypassed the ballast resister and let it have full voltage all the time, but that's hard on points and the standard 6 volt coil.

It has both a starter pushbutton and an ignition switch with a "start" position. Also before the high output coil, (and the resister bypass) you could hold the key switch in the start position as you cranked the engine with the pushbutton and continue holding it until the engine sped up and leveled out or it would die.

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