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John Deere Tractors Discussion Forum
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420- WONT START

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BILL - PENNA

02-10-2005 03:49:50




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I WASHED MY 420 ABOUT 2 WEEKS AGO,WITH THE ENGINE RUNNING. IVE NEVER HAD ANY PROBLEMS WITH THIS TRACTOR. HOPPED ON YESTERDAY, AND IT WONT START.TUNED UP ABOUT 20 HRS AGO,GOT PLETY OF GAS ----- -COIL ?




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Mark57_420

02-10-2005 17:43:32




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 Re: 420- WONT START in reply to BILL - PENNA, 02-10-2005 03:49:50  
Ditto on the distributor. I"ve done it before myself...more than once... While you"re at it, be careful with the brakes. They tend to get wet if you don"t plug the holes when you wash them. Don"t ask my why I remember that one.....



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John T

02-10-2005 05:24:08




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 Re: 420- WONT START in reply to BILL - PENNA, 02-10-2005 03:49:50  
Bill, I pretty much agree with Peter's good advice since that wash job may have left moisture condensed or accumulated under the distributor cap or other critical places. While at it with a hair dryer under the cap, I would inspect the points and replace if badly burned or pitted or heavy gray oxide coated,,,,, ,, and at least run a clean dry shop cloth between its points,,,,, ,I would also remove and clean n dry all the coil n plug wire terminals,,,,, ,,,,, then, to see if at least the coil is firing, remove the coil wire from the distributor cap (leave coil end intact into coil) and place its bare end to within 1/8 inch or so away from tractors steel/frame, turn her on n crank her over and see if a good blue spark jumps that gap???

If not, place a test lamp or voltmeter on the coils lil high input (NOT to distributor) side terminal, turn on the ignition, AND THERE MUST BE HOT BATTERY VOLTAGE THERE. If not look for an open wire from the switch to the coil or a blown fuse or a bad ignition switch. If you hot wire it by running a live hot wire to the coils high input terminal and she fires then, you found the problem.

Hopefully shes got got moisture !!!!! !

John T

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CPeter

02-10-2005 04:17:21




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 Re: 420- WONT START in reply to BILL - PENNA, 02-10-2005 03:49:50  

Probably moisture in the distributor. Take the cap off and dry it out with a electric heat gun or hair dryer. also check under the dust plate and check the points for corrosion. I have had the same thing happen.

The coil should be mounted with the tower pointing down so that is probably not the problem. Also check the voltage at the coil, sometimes the ignition switch causes problems.

CPeter

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