(800) 853-2651
SHOP NOW

1086 IH Digital Tach will not work

D

D Rush

New User
Sent tach to AgExpress for repair. They could not find anything wrong. No blown fuses, What could cause this problem?
 
Does the unit not light up at all or just read 0 on all settings?

I have had problems with corroded electrical pmugs at the flywheel speed sending unit and at the large gang connectors at the rear of the engine and cowl area.
 
Sounds like it is not getting power. Check the fuse and wiring to the tach.
Possibly a bad cab power relay. Do the other gauges , cab blower and such work ?? They are all powered by the cab relay.

Their is a good wiring diagram in the operators manual.
 
Use a voltmeter or test light to see if you have 12V in the plug that connects to the dig tach.

Your wiring diagram may have the position and color code for the supply and ground wires.

If the repair shop says the dig tach is ok, then it is a pretty good chance that it lacks power or ground on your tractor.
A DVOM can test the plug for both 12V supply and ground.
 

I put a new oil pressure switch on this evening and tach is working fine.

Thank you very much for all the info.
 
I was about to mention the pressure switch but you found it. If you want to, you can put a jumper in the plug that plugs into the pressure switch to bypass the switch. Then search around and find where the power wire gets it's power and move it to a switched location instead of steady hot. That way the tach comes on whenever you turn on the ignition switch. It's been so long ago that I did that to my 1086 I've forgotten which wire it is but it's not too hard to do. If I remember right, you do it by the fuse panel. Jim
 
Thanks guys, I did not realize that the tach was powered from an oil pressure switch on a 1066.
Anyone know why that was done instead of powering it from the ignition switch ??

I ran into that on later 14 series IH combines where the electro hydraulic valves were powered from an engine oil pressure switch so the reel or header drop hydraulic functions would not work if the engine was not running.
 
You must log in or register to reply here.

Similar threads

T
Electrical Problems
Replies
5
Views
473
Texasmark
T
T
How do I drain the radiator and engine block?
Replies
6
Views
472
caterpillar guy
C
S
Tach for White 2-155
Replies
0
Views
169
seasoned_geek
S
3
300 Tach update
Replies
5
Views
515
pinball
P
T
3600 Tach Drive
Replies
5
Views
467
Texasmark
T
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top