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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Tach on a diesel

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Farmer in the D

10-25-2003 11:05:57




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Is there a way to hook up a coil mounted tach on an 1850 diesel? The standard equipment one is cable mounted to the unit on the front left (as you sit on it) and the internal cable must be broken. Are these replaceable like the spedometer cables?




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Don-WI

10-27-2003 19:29:24




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 Re: Tach on a diesel in reply to Farmer in the Dells (WI), 10-25-2003 11:05:57  
I don't think a new cable cost too much, but one thing--DON'T REMOVE OUTER CASING!!! I did this on my 1755, had a he!! of a time getting the new one in. Just pull out the old cable, beleive from tach side, and slide new inside cable through the outer casing. Heck of a lot easier on these tractors. I also ended up pinching the cable, causing very eratic and sudden needle movement, as the cable would bind, then in a fury it would release. After a little bit of this the needle broke. I still get hours, but no rpm's.
Donovan from Wisconsin

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Myron KY

10-25-2003 18:07:46




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 Re: Tach on a diesel in reply to Farmer in the Dells (WI), 10-25-2003 11:05:57  
I know, on my 1850, the cable is just long enough to reach between the drive and tach. No extra length. It may be that the internal cable has slipped out of the drive or tach. I would suspect the tach end first. I had erratic tach readings and found that the cable wasn't inserted far enough into the tach. There are clamps securing the cable as it routes around the front and down the side of the engine. I had to loosen these to get enough length to the tach.

Just a thought.
Myron KY

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Shep Va

10-25-2003 16:27:44




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 Re: Tach on a diesel in reply to Farmer in the Dells (WI), 10-25-2003 11:05:57  
On the Cummins tractors that I run you cant use a cable mounted tach, so I use electric ones. You can put a sensor in the bell housing of the Cummins engines, but probably not the Perkins. For a Perkins engine you can put a diode in the Altinator and run the tach off the altinator. Works pretty slick and is a lot more reliable. I have used Murphy tachs and Isspro ones. I kinda like the Murphy ones better, but they both work.

Everytime I have a coupler chain break it always takes out my speedo cable, but I havent found and electric speedo set up that worked good and didnt cost a huge amount. Still working on that one.

Good luck

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hey ShepVa

10-25-2003 17:22:00




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 Re: Re: Tach on a diesel in reply to Shep Va, 10-25-2003 16:27:44  
So this diode hookup...what kind of diode and is there any wiring diagram anywhere?



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Bob

10-26-2003 11:08:56




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 Re: Re: Re: Tach on a diesel in reply to hey ShepVa , 10-25-2003 17:22:00  
There is no extra diode involved. You buy a tach that works off the alternator, and then you need an alternator with a tach connection, or you can add a tach connection to any alternator by connecting a wire to one of the stator leads inside the altenator, and bringing the other end outside the alternator, where it can be connected to the lead from your new tach.



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Brad

10-26-2003 12:58:00




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 Re: Re: Re: Re: Tach on a diesel in reply to Bob, 10-26-2003 11:08:56  
How do you get them "geared" correctly to register the right rpm?



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Bob

10-26-2003 15:04:12




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 Re: Re: Re: Re: Re: Tach on a diesel in reply to Brad, 10-26-2003 12:58:00  
Generally, the tach has an internal adjustment to match it to the application.



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Shep Va

10-26-2003 11:28:22




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 Re: Re: Re: Re: Tach on a diesel in reply to Bob, 10-26-2003 11:08:56  
You are correct Bob. Some altinators already have this connection and some you have to put it in them. I guess I called it the wrong thing, its not a diode, it is more of a connection to the altinator. It works really good too.



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Brad

10-25-2003 11:10:31




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 Re: Tach on a diesel in reply to Farmer in the Dells (WI), 10-25-2003 11:05:57  
I haven't found a easy way to hook up a electric tach on a diesel that is cheaper than fixing what you have. the cable can be easily replaced but they are not cheap, I think about $80. The 90 degree drive is is a common problem.



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