Farm Equipment - 7020 Alternator issues

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7020 Alternator issues

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=150296
Printed Date: 12 Nov 2025 at 11:12pm
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Topic: 7020 Alternator issues

Posted By: W2gearjammer
Subject: 7020 Alternator issues
Date Posted: 09 May 2018 at 4:41pm

So the alt light on the 7020 was going on and off last fall and of course when this happens no tach now this spring it has come on and stayed on ive checked wiring and put brand new batteries in it it has the niehoff on it with the double pully so my question is will this one from shoup work?? https://www.shoupparts.com/38200-Alternator-For-Allis-Chalmers-Tractors/" rel="nofollow - https://www.shoupparts.com/38200-Alternator-For-Allis-Chalmers-Tractors/ thanks

Replies:

Posted By: DrAllis
Date Posted: 09 May 2018 at 4:47pm

7020 never came with a Neihoff brand (cast iron) alternator. They came with 100 amp Delco. So, I'd guess it should work.

Posted By: hillmonkey
Date Posted: 09 May 2018 at 6:45pm

Im no expert but the one you sent a link to is for the 426 ci tractors. looks like you need part #38250 or 38725, neither one of those are shown with a pulley,so your pulley might not fit the delco??? I would call before ordering from them.
you might want to try Sandy lake Implement and explain what you have and what you are trying to do. 724-376-2489

Posted By: W2gearjammer
Date Posted: 09 May 2018 at 8:31pm

Ok does anybody have a part number for the actual delco that was factory??

Would it be possible to have niehoff off of a 7040 7060?? How many model numbers of niehoffs did ac use???

My 7020 is a early production as far as serial number goes

Posted By: FREEDGUY
Date Posted: 09 May 2018 at 8:47pm

Without knowing your serial #, found AGCO part # 70262388 with a Delcotron # 1102922, 72 AMP

Posted By: DrAllis
Date Posted: 09 May 2018 at 9:07pm

This is a great example of having someone local who you can trust to provide/buy your repairs parts from. A black chassis model AC 7000-7010-7020 came with an easily obtainable GM Delco-Remy 72 or 100 Amp 3-prong alternator that is "clocked" with the 3-prongs out on the top. This is a no brainer for anyone who works on this kind of stuff. The alternator Shoup is showing has the wrong pulley belt width and probably wrong diameter as well. And if it isn't clocked correctly ( the picture isn't) it won't work. Get reman alternator, clock it correctly, install your pulley and go back to work. Any Deere or Case/IH dealer has one on the shelf.

Posted By: Michael V (NM)
Date Posted: 09 May 2018 at 9:55pm

If ya want to order from Shoup, I'd get the 38250,, I got a Delco replacement at a local parts store for my 8010..IIRC it came without a pulley so I had to use the one I had.

I got a Delco replacement for my 7060 from Shoup to replace the Neihoff,,(works great) I couldn't afford the Wilson or Niehoff type original,,,the tach was replaced with an Isspro by a P.O. and hasn't been right,,, not sure whats happening there

BTW, I still have the Niehoff that come off the 7060,,, I know there's some gold in it somewhere.....

Posted By: KJCHRIS
Date Posted: 09 May 2018 at 9:58pm

Follow the Dr's advice. You should have a 3.50" OD pulley for 2 of 1/2" wide belts.

Worked on a 7010 with a Tach that didn't read correct speed ( read low ) it had a 3 7/8" OD pulley on it , had me pullin my hair out for a while till I checked pulley diameter. Rblt Alt had came from a J D Dlr with that pulley on it.

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Posted By: W2gearjammer
Date Posted: 10 May 2018 at 3:07pm

So quick update called sandy lake imp and they verified that you could in fact get the heavy duty niehoff for a 7020 and they did have a part number and a replacement part number for it the alternator is coming from a mfg in ohio and supposed to bolt right up thanks all for the help