Farm Equipment - 7020 tac playing tricks

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7020 tac playing tricks

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=194829
Printed Date: 18 Jul 2025 at 3:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7020 tac playing tricks

Posted By: youngorange2000
Subject: 7020 tac playing tricks
Date Posted: 25 Apr 2023 at 7:32pm

The tach on my 7020 started a new trick this year. I will start the tractor and the tac will work for about 5 minutes then nothing. It's done this three times this year. Last year about every other time I used the tractor I would start the tractor the tac wouldn't work for the first few minutes then it was like a light switch and it would work and stay working. Is there a pickup sensor somewhere that's finally given out? Thanks

Replies:

Posted By: MACK
Date Posted: 25 Apr 2023 at 8:57pm

First thing, tighten fan belt. If alt. pulley is Shiney in the bottom, replace pulley and belts. MACK

Posted By: steve(ill)
Date Posted: 25 Apr 2023 at 9:28pm

Luke, the tach gets its signal from an output on the alternator...

https://www.allischalmers.com/forum/tachometer-for-7020_topic182084.html" rel="nofollow - https://www.allischalmers.com/forum/tachometer-for-7020_topic182084.html

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 25 Apr 2023 at 9:32pm

https://www.allischalmers.com/forum/7020-alternator-issues_topic150296.html%20" rel="nofollow - https://www.allischalmers.com/forum/7020-alternator-issues_topic150296.html

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Like them all, but love the "B"s.

Posted By: Joe(OH)
Date Posted: 26 Apr 2023 at 8:42am

I had something similar years ago on a 7000 and a 7020. Wasn't long after playing that trick that it needed a new alternator.

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Life is simpler when you plow around the stump.

Posted By: youngorange2000
Date Posted: 27 Apr 2023 at 9:20pm

Belts are tight doesn't change it all wire connections are tight on the altinator

Posted By: Jack(Ky)
Date Posted: 29 Apr 2023 at 8:10am

My 7020 did that and it was the alternator going bad.

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'59 D14 '68 170 Diesel '81 7020 40 All Crop