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Hey guys haven't posted in a long time.  I bought a new to me 1086 last weekend.  The tach quit working tonight....  I'm not much of a mechanic and IL be honest I have not cracked open the tractor operators manual very far yet.  I was wondering if anyone had any suggestions on what I might b up against here.  The speedometer works yet and the exhaust temp. if that helps rule anything out.  I will have many other questions to follow about other things but for the most part this is a pretty straight tractor.  Thanks for any help!

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I would be checking for a faulty engine speed transducer since that does both engine rpm and PTO speed functions

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Make sure the sensor is adjusted correct , if I remember correct , turn it in all the way and back it 1 turn out . There is an ohm test , I can look that up if you need it .

Danny

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Also take it out completely check the transducer pick-up end for damage or a coating of grease or oil on the end and the wiring you can also test it using a thin metal object and watching the tach to see if it displays momentary readings while brushing the screwdriver across the magnetic tip quickly 

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Here are the specs..

THE RPM SENSOR 130908C2 SHOULD MEASURE <1200 ohm’s AND INCREASE

DECREASE WITH ENGINE RPM’S

THE MPH SENSOR 121869C2 SHOULD MEASURE <1200 ohm’s AND INCREASE/

DECREASE WITH GROUND SPEED

THE EGT SENSOR 130898C2 SHOULD MEASURE 80-100 ohm’s AT ROOM

TEMPERATURE AND 300 ohm’s AT 1200 DEGREES

 

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22 minutes ago, CIHTECH said:

Here are the specs..

THE RPM SENSOR 130908C2 SHOULD MEASURE <1200 ohm’s AND INCREASE

DECREASE WITH ENGINE RPM’S

THE MPH SENSOR 121869C2 SHOULD MEASURE <1200 ohm’s AND INCREASE/

DECREASE WITH GROUND SPEED

THE EGT SENSOR 130898C2 SHOULD MEASURE 80-100 ohm’s AT ROOM

TEMPERATURE AND 300 ohm’s AT 1200 DEGREES

 

I'll save that for my own good. Thanks 

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Ok guys thanks for the help.  I had to Crack the book open because I had no idea what a transducer was or where it was located lol ( instead of saying I'm not mechanical I should have said to really dumb it down for me ha)  anyway I have a question now.  The book doesn't say how to move the gear tooth.  So my question is once I remove the transducer how do I move the gear to make sure it lines up with tip of transducer?  

20210512_095457.jpg

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turn it by hand til a tooth is perpendicular with the transducer and adjust the transducer according  and lock the nut  its the flywheel ring gear teeth that it senses 

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