8000 series tach Issue
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=136331
Printed Date: 08 Nov 2025 at 2:48pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8000 series tach Issue
Posted By: pdh
Subject: 8000 series tach Issue
Date Posted: 17 Mar 2017 at 6:32pm
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Went to look at an 8050 today. Tach does not work at idle. Throttle to wide open and it starts working and seems "normal" as long as throttle is wide open. Back off the throttle more than 100 or 200 rpms and it quits reading again. Fixable? Or have to replace? |
Replies:
Posted By: DennisA (IL)
Date Posted: 17 Mar 2017 at 6:53pm
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The sensor pickup needs to be adjusted. It's very easy to adjust. Just unplug it and screw it in until it touches the flywheel then back it off one turn and plug it back in. ------------- Thanks & God Bless Dennis |
Posted By: pdh
Date Posted: 18 Mar 2017 at 5:31am
| Sounds easy enough - point me to the general location of the sensor? Thanks. |
Posted By: Lynn Marshall
Date Posted: 18 Mar 2017 at 8:02am
| Left side. Below the starter. |
Posted By: pdh
Date Posted: 18 Mar 2017 at 10:41am
| Many thanks to both of you. |
Posted By: AllisandGleaner
Date Posted: 21 Mar 2017 at 7:23pm
| Ok I have the same problem with my 8030 and I tried to adjust it as said and it still has the same problem, doing the same thing. Like it tries at idle but not enough you have to rev it up to 900 rams to get a response. Any pointers? |
Posted By: Unit3
Date Posted: 21 Mar 2017 at 9:40pm
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Trouble with an 8000 series tach, join the club. Oh the joys of an old tractor. ------------- 2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C |
Posted By: Ron(AB)
Date Posted: 21 Mar 2017 at 11:28pm
Do you have another used tach to swap out and compare/trobleshoot? |
AllisandGleaner wrote:Posted By: AllisandGleaner
Date Posted: 22 Mar 2017 at 6:14am
| Nope it's my first 8000 series tractor so this is new territory for me. |
Posted By: DennisA (IL)
Date Posted: 22 Mar 2017 at 4:31pm
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The next step is to check the ohms of the pickup. I don't know what the ohms should be. Be best to compare to a new one if you can. Pickups can and do go bad. ------------- Thanks & God Bless Dennis |