RPM gage is off.

kimjes · May 9, 2023

When my tractor is at it's lowest idle, 540 normally, my gage reads 1600 RPM and at MAX normally 2600 RPM it reads 2900 RPM
What is wrong, is it a sensor issue or what is it?

Fuddyduddy1952 · May 9, 2023

What tractor, analog or digital, did it suddenly happen?

kimjes · May 12, 2023

Fuddyduddy1952 said:
What tractor, analog or digital, did it suddenly happen?

I have a LS j27 HST from 2018. And it digital, if we are talking about the display

Tinhack · May 12, 2023

I would check the wiring for abrasions (short to ground) and reset/clean any inline connectors. Check your manual to see if the tach signal comes from the alternator. Make sure those connections are clean and tight.

kimjes · May 13, 2023

Tinhack said:
I would check the wiring for abrasions (short to ground) and reset/clean any inline connectors. Check your manual to see if the tach signal comes from the alternator. Make sure those connections are clean and tight.

Well sadly my manual doesn't say anything about the tach, and that's why I can't finde it. I've searched online fare and low to finde a manual, or perhaps someone who can tell me where its located

Tinhack · May 13, 2023

Does is show anything about the alternator? A photo of the back of your alternator might provide a clue. Or look for a wiring diagram for your tractor. It should show where the tach line comes from.

kimjes · May 14, 2023

Tinhack said:
Does is show anything about the alternator? A photo of the back of your alternator might provide a clue. Or look for a wiring diagram for your tractor. It should show where the tach line comes from.

I don't have the wirering diagram, but could it perhaps be the Governor that's making the problems?

Tinhack · May 14, 2023

What I meant was, you post a photo of the back of your alternator.

Cougsfan · May 14, 2023

I think what Tinhack was trying to point out to you is that point out to you is that many tachs these days get there speed by counting the AC pulses of the alternator. If so, there is a wire from the back of the alternator up to the tach that you should check to make sure the connection is good.

kimjes · May 16, 2023

Cougsfan said:
I think what Tinhack was trying to point out to you is that point out to you is that many tachs these days get there speed by counting the AC pulses of the alternator. If so, there is a wire from the back of the alternator up to the tach that you should check to make sure the connection is good.

Oh! that i'll try, thanks for the advice, much appreciated.