Farm Equipment - Tach/hourmeter

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Tach/hourmeter

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=199648
Printed Date: 22 May 2025 at 11:21pm
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Topic: Tach/hourmeter

Posted By: MrSnerdly
Subject: Tach/hourmeter
Date Posted: 04 Feb 2024 at 7:41pm

The hour meter works in my 7030 but the tach doesn't. I think this means a new tach but is there any possibility there is something that could be done to repair? If not, is the dealer the best place get a get a new one?

Replies:

Posted By: steve(ill)
Date Posted: 04 Feb 2024 at 8:28pm

read this for vendor info...

https://www.allischalmers.com/forum/tachometor-allis-185_topic199623.html" rel="nofollow - https://www.allischalmers.com/forum/tachometor-allis-185_topic199623.html

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

Posted By: Lynn Marshall
Date Posted: 04 Feb 2024 at 8:38pm

The tach in the 7000 series all receive an electric signal from the alternator. Check the alternator and all the connection leading into the cab.

Posted By: MrSnerdly
Date Posted: 04 Feb 2024 at 8:50pm

If the hour meter works doesn't this mean it is getting a signal?

Posted By: Lynn Marshall
Date Posted: 04 Feb 2024 at 10:18pm

That's kind of a good question. But, I don't think so. The tach has a positive and negative terminal on the back and I think that the positive is just key switched. With the key on, engine off, can you see the hour meter move or even hear it click? The tach receives it's signal from the alternator and it is a variable signal so that the sweep hand corresponds to the increase in RPM from the engine. I don't believe that it has anything to do with the hour meter.

Posted By: Lynn Marshall
Date Posted: 05 Feb 2024 at 8:01am

I should have asked if this tractor has a Delco or Niehoff alternator. Not that it really makes a difference. They both operate on the same principle.

Posted By: MrSnerdly
Date Posted: 05 Feb 2024 at 4:56pm

Well, the hour meter does work with the switch on and motor stopped. It has a Delco alternator. I will try to check out a few things tomorrow when it is a little warmer.