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John Deere Tractors Discussion Forum
Show Parts for Model:

3020 diesel rocker arms

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SVcummins

07-12-2018 05:00:05




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Are 3020 and 4020 diesel rocker arms the same part number




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Glen D Anderson

07-13-2018 04:52:11




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
No snake oil used on these premises.....LOL
The hardening / shrinkage is just something that happens after 40 - 50 years, +/-, of service.

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Glen D Anderson

07-12-2018 21:10:36




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
Are the plugs on your rocker shaft the rubber style?

If so, I'd recommend replacing them while you're this far unless they've been done recently.......

It's no fun when they shrink from old age & start migrating up the shaft cutting off oil to a portion of the valve train. LOL
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SVcummins

07-13-2018 13:49:44




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 Re: 3020 diesel rocker arms in reply to Glen D Anderson, 07-12-2018 21:10:36  
I honestly didnít look but Iím sure they are but I didnít have any and I wanted to get it back together and I would have had to wait for parts



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SVcummins

07-12-2018 18:39:00




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  

Hereís a better picture and a picture of the new style



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David G

07-12-2018 15:53:01




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
Any other damage from the event?



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SVcummins

07-12-2018 18:00:28




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 Re: 3020 diesel rocker arms in reply to David G, 07-12-2018 15:53:01  
Nope everything looks great



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David G

07-12-2018 18:08:01




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 18:00:28  
Good.

Looks a little sludged up, must have been bad when you got it.



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SVcummins

07-13-2018 03:17:01




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 Re: 3020 diesel rocker arms in reply to David G, 07-12-2018 18:08:01  
Maybe somebody tried using Lucas in it ?



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tomstractorsandtoys

07-12-2018 14:48:10




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
That just happens sometimes with age. The new ones from Deere are made different and much stronger now. I broke one on my 4020 10 or so years ago and that tractor never had either. I ordered a set of the new style ones and stuck a used one on to get back going and the set of new ones are still here in the shop. Tom



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SVcummins

07-12-2018 18:06:05




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 Re: 3020 diesel rocker arms in reply to tomstractorsandtoys, 07-12-2018 14:48:10  
My 4020 broke a bolt that holds the rocker arm clamp and it messed up about 6 rocker arms I kept the best ones and I had one new one that just happened to be the one i needed



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donmyeil

07-12-2018 13:12:29




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
Too much either , check the push rods , no doubt bent . I have seen this many times .



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SVcummins

07-12-2018 16:21:49




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 Re: 3020 diesel rocker arms in reply to donmyeil, 07-12-2018 13:12:29  
Push rod is straighter than an arrow .



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Glen D Anderson

07-12-2018 09:47:24




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
Ouch! What happened there?

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SVcummins

07-12-2018 18:07:30




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 Re: 3020 diesel rocker arms in reply to Glen D Anderson, 07-12-2018 09:47:24  
I guess after 50 years the strain was more than it could bare



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Tx Jim

07-12-2018 05:31:12




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 Re: 3020 diesel rocker arms in reply to SVcummins, 07-12-2018 05:00:05  
Yes AR54904 & AR54905



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SVcummins

07-12-2018 18:08:09




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 Re: 3020 diesel rocker arms in reply to Tx Jim, 07-12-2018 05:31:12  
Thanks



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