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John Deere Tractors Discussion Forum

4020 Electrical

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Author  [Modern View]

03-14-2019 08:51:42

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4020 update. New batteries and new cables. All I get is a click - even when I try to jump across the solenoid. Next ideas? Take off the starter and wire brush where it connects to the block? The starter is about 1 year old - so I would be shocked if that is the problem? I'm thinking of trying to pull start it? Also thinking of digging a hole and pushing it in!!! Thanks for any ideas.

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03-16-2019 05:07:26

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 Re: 4020 Electrical in reply to isuvinny, 03-14-2019 08:51:42  
Forgot to mention in previous post to make sure tractor is in neutral or park when
working on it.

If person isn't smart enough to do this,
they shouldn't be working on a tractor

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03-15-2019 04:30:41

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 Re: 4020 Electrical in reply to isuvinny, 03-14-2019 08:51:42  
Try loosening & then tightening the starter mounting bolts
several times to get good grounding to the frame/ engine.

Not really an accepted method, but shorting across the
heavy terminals on the solenoid will tell if the starter
is good. This assumes that the batteries & cables going
to the solenoid are in good shape.

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03-14-2019 10:37:53

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 Re: 4020 Electrical in reply to isuvinny, 03-14-2019 08:51:42  
No need to wire brush that area since later tractors have gaskets there. They ground through the bolts. (Assuming this is 12V?)

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03-14-2019 09:20:28

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 Re: 4020 Electrical in reply to isuvinny, 03-14-2019 08:51:42  
Quoting Removed, click Modern View to see

Ground one lead of an unpowered test light to the metal case of the starter and connect the other lead to the copper stud coming out o fthe starter 'belly" where the strap from the solenoid connects and try cranking it.

If test light lights and NO starter action, trouble is INSIDE the starter.

If test light does NOT light, move the second lead to the post on the starter solenoid where the battery cables connect.

Should light, then try to crank it.

If light stays on, problem is in the solenoid, if it goes out, there's a battery or cable issue.

Just to completely rule out a "starter not grounded to the engine" issue, connect the test lead between the "frame" of the starter and a good chassis ground.

On the odd chance the starter is not grounded to the engine, the ligt light when cranking is attempted.

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Bob Bancroft

03-14-2019 09:03:49

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 Re: 4020 Electrical in reply to isuvinny, 03-14-2019 08:51:42  
Don't be shocked. Sounds like the internal contacts in your solenoid are not contacting!

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03-14-2019 10:49:44

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 Re: 4020 Electrical in reply to Bob Bancroft, 03-14-2019 09:03:49  
Thanks for the suggestions - hopefully I will get back to it this weekend. Part time farmer - and not much of a mechanic - so I appreciate the help!!

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