6080 tach gremlins
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=141543
Printed Date: 01 Jan 2026 at 1:51am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 6080 tach gremlins
Posted By: Eldon (WA)
Subject: 6080 tach gremlins
Date Posted: 16 Aug 2017 at 8:55pm
I cleaned up the 6080 and got a few problems fixed. When I started it up the tach would only read a constant 900 rpm. Pulled the plug on the alternator (I assume that is what feeds it), cleaned it up and I could get it to go to 0 or 900. I was messing with the fan switch and noticed it jumped up to the correct rpm. Turned blower back on and tach worked as it should. Any ideas what was going on?
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Posted By: MACK
Date Posted: 17 Aug 2017 at 9:15am
Posted By: Eldon (WA)
Date Posted: 17 Aug 2017 at 9:22am
Both belts are pretty tight....funny watching the AC belt when I play with the fan switch, the higher I turn it up the more it bounces! I guess running the AC does take some power.
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Posted By: wekracer
Date Posted: 17 Aug 2017 at 12:10pm
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Those belts have to be really tight. If I remember right one belt off the crank runs everything.
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Posted By: Eldon (WA)
Date Posted: 17 Aug 2017 at 1:01pm
Mine has two belts. I tightened the alternator belt some more, and it appears to be working ok now. It read low for a few minutes for some reason, then caught up. Maybe getting a little slip yet when under heavy electrical load...had to crank quite awhile to get it to fire this morning. It doesn't like cold starts under 80 degrees LOL!
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Posted By: lowell66dart
Date Posted: 17 Aug 2017 at 6:43pm
Could one of the pulleys be worn to where the belt is bottomed out?
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AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear.
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Posted By: DougS
Date Posted: 17 Aug 2017 at 7:37pm
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Measure the charging voltage out of the alternator. If the alternator isn't putting out 14-ish volts, the problem is alternator related. The alternator needs to be charging before you'll get a tach output. Also check and ensure that the ground wire is secure from the tach.
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