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4020 electrical

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rob

12-20-2002 10:56:07




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I have a 4020 and in five years it has never gave me one problem, until yesterday. I went to start it and got nothing but a few clicks, tried jumping it, nothing. The left battery (it has one on each side)had a corroded ground cable so I cleaned the post and the connector, had it on a big charger about one hour and when I tried to start it I had a nice fireworks display, it had fried about 3/4 of the negitive post right off the top of the battery, WHAT IS GOING ON? Thanks for any help.

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C

12-24-2002 20:20:11




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 Re: 4020 electrical in reply to rob, 12-20-2002 10:56:07  
Poor connection. You need to scrape off ALL of the black oxide (non-conductive) coating on the outside of the post and inside the terminal. What happened is you just had one small spot that was clean and conducting, then when you hit the starter button all the current went through that one area and it got really hot and melted/vaporized the lead battery post.
Make sure everything is clean to bare lead around the whole circumference and you get good contact all the way around.

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Gordon

12-20-2002 19:11:48




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 Re: 4020 electrical in reply to rob, 12-20-2002 10:56:07  
Check your cables agian.The left front is neg hot and goes to the solenoid. left rear goes across to neg the pos on right goes to starter. on the back side the pos on the left has a small jumper wire to frame.That wire splits the system. You also could have a bda starter. Check you have 2 cuircit braekers on the starter. I saw more than one tractor burn the wireing off because they where not on.This is on a 24v system.

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Phil

12-20-2002 17:31:53




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 Re: 4020 electrical in reply to rob, 12-20-2002 10:56:07  
I had something similiar happen to mine, except mine sparked and caught on fire when I stepped on the floor pan. The battery boxes were old and rusting out and the previous owner tried to repair them by putting additional metal on the bottom. By doing so the battery was higher and when I stepped on the floor pan it shorted the terminals. Fortunately it only burned the insulation off of a wire and then went out by itself because I just about ran out of breathe running to the house for a fire extinguisher.

The first repair I did was put the fire extinguisher on the tractor, then I put insulation between the terminals so they couldn't short out again.

Not sure if this is what happened to you or not but its worth a look.

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John T

12-20-2002 13:15:09




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 Re: 4020 electrical in reply to rob, 12-20-2002 10:56:07  
Rob, do you have a dual battery 24 volt (two 12's in series) stystem?? If so, they both are in series with 24 volts (two big cables, one from each battery) going to the starter (its a two wire 24 volt ungrounded device) and the other non grounded battery ends being joined together and connected to the frame ground. I dont have any 4020 wirign diagrams to assist you with, but take a look and see what system (12 or 24) you have. Dave Wickman (WTW) who works at Deere is good n the 24 volt syatems. Ol John T Nordhoff

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rob

12-20-2002 17:02:55




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 Re: Re: 4020 electrical in reply to John T, 12-20-2002 13:15:09  
It is a 24 volt system, I just didn't want to replace the terminal and the battery to have the same thing happen again.



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John T

12-20-2002 17:36:41




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 Re: Re: Re: 4020 electrical in reply to rob, 12-20-2002 17:02:55  
Rob, the next thing I would check is the OTHER end of that ground cable where it connects to the tractors frame to insure a good clean corrosion and carbon free connection at both ends of that cable. The previously described corroded end you mentioned could still have some carbon build up lurking somewhere which can cause heat build up. (that whole cable could need replaced) When the starter solenoid engages, the current flow is through both batteries in series, and a bad connection at any point in the circuit (both battery ends and both batteries tie ground point) can cause carboning up and heat. I would also check the condition of the other side battery and its cable and ground connections and be sure its also fully charged, because if one battery is weak, it causes more of a load (and heat) on the other. John T

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Ralph

12-20-2002 11:33:28




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 Re: 4020 electrical in reply to rob, 12-20-2002 10:56:07  
Sounds like there was a poor connection at that post of the battery.



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