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John Deere Tractors Discussion Forum

4020 starter stuck

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awier

02-14-2004 11:59:58

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have a 1968 24 volt 4020 and it needed a jump start. going from old posts on this board i hooked up my charger up to the left battery, pos to pos and neg to neg, flipped the charger to start and pushed the start button on the tractor. cranked for a few seconds and let out on the start button but the started kept on crankin. yanked the charger off and unhooked that batteries neg side. now i have a twenty two volt difference between the neg cable and the neg post on the left side battery.

did i smoke the starter? any ideas?

andy

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Gary in TX

02-14-2004 13:48:34

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Re: 4020 starter stuck in reply to awier, 02-14-2004 11:59:58

Prime reason why I would convert that hoss to a 12 volt system. I did my 3020 and will never be sorry for it. 12 volt starter, one wire alternator and I was up and running!

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Mark

02-14-2004 13:01:36

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Re: 4020 starter stuck in reply to awier, 02-14-2004 11:59:58

You have probably welded the solenoid contacts. This happens under heavy load and low voltage. Take the solenoid off and take it apart and clean contact points and disc. When you want to jump the tractor you need 2 sources for 12 volts. either 2 hd battery chargers, or 2 sets of jumper cables and 2 good batteries. One source to one battery,+to+ and -to- and one source to the second battery,+to+ and-to-. The only way 12 volts will start a 24 volt tractor is if you have one known bad battery on the tractor and hook the charger to it. Same reasoning behind starting your 12volt truck with a 6 volt battery,just won't happen.

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awier

02-14-2004 13:05:08

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Re: Re: 4020 starter stuck in reply to Mark, 02-14-2004 13:01:36

thanks Mark.

i will give it a try.

andy

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Bob

02-14-2004 14:51:23

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Re: Re: Re: 4020 starter stuck in reply to awier, 02-14-2004 13:05:08

Andy,

As Mark said, take the solenoid apart, Sometimes it is possible to flip the contact disc over, and turn the two contact studs 1/2 turn so you have all new contact surfaces. Blow the inside of the solenoid out with compressed air to get rid of all conductive debris.

Often, the reason solenoid contacts stick is that originally there is a plated layer of silver on the contacts, or even an actual silver contact soldered to the large studs. When the solenoid has been used enough that the silver layer is gone, and the copper disc arcs against the copper studs, the copper-on-copper is more prone to weld together.

Take special care to unhook both batteries before you start, and be especially carefull to mark every wire and take notes, if necessary, as to where everything is connected.

It appears the individual contacts are no longer available from Deere, but an automotive electrical shop would probably have them, if yours turn out to be burned. The complete solenoid is available from Deere for $41.99.

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awier

02-14-2004 19:44:05

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Re: Re: Re: Re: 4020 starter stuck in reply to Bob, 02-14-2004 14:51:23

i will take it apart sunday or monday. thanks for all the help. i asked the guy behind the counter at the local jd shop and he wanted to just sell me a new 24 volt starter for $375. i hoped there was more i could do to trouble shoot before shelling out cash like that. thanks again for the ideas, the free help here is excellent.

andy wier

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awier

02-14-2004 12:41:20

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Re: 4020 starter stuck in reply to awier, 02-14-2004 11:59:58

forgot to mention that when the neg cable is hooked up, the starter cranks, i got a short somewhere. is the starter the most likely place and how should i test.

andy

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