Farm Equipment - 7040 altenator

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7040 altenator

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=48241
Printed Date: 27 Aug 2025 at 4:28pm
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Topic: 7040 altenator

Posted By: Hurt Farms
Subject: 7040 altenator
Date Posted: 31 Mar 2012 at 8:37am

i just replaced my niehoff with a delco now my tach isn't right!anybody had this problem

Replies:

Posted By: Lynn Marshall
Date Posted: 31 Mar 2012 at 10:38am

You need to replace the pulley with a larger diameter one.I can get the dimensions if you want them,otherwise the tach will read high.

Posted By: Hurt Farms
Date Posted: 31 Mar 2012 at 5:40pm

yeah!i would greatly appreciate it

Posted By: Lynn Marshall
Date Posted: 31 Mar 2012 at 9:59pm

Sorry for the delayed response.The original pulley for the niehoff was a .670 bore with a 3 1/2 inch diameter.When converting to a delco, you need a .670 bore by 3 7/8 inch outside diameter. No belt change should be needed.Pulley groove width is 5/8 inch for the Allis belts.I get mine out of Sioux City,Iowa.

Posted By: Hurt Farms
Date Posted: 01 Apr 2012 at 7:04pm

thanks!i got a friend who owns a alternator shop he should be able to get it for me.

Posted By: SIMPLICITY
Date Posted: 01 Apr 2012 at 9:39pm

HI LYNN
WHO DO YOU GET THE PULLEY FROM IN Sioux City,Iowa.