MF 6170 Rev counter intermittent

[alfapat]

Can anyone point me to what sensor picks up the tachometer drive ie Rev counter. Is it off the gearbox for instance?

 

[Mur Huwcun]

Yes off the hydraulic pump drive gear. It’s by the hydraulic filter

 

[alfapat]

That’s great , shall have a look

 

[alfapat]

That’s great , shall have a look

Ok removed two connectors off a sensor to the rear and above the oil filter, but it hasn't worked .I took a picture of its position , rested the phone on the tractor tyre and forgot it was there after a while ......... yes you've guessed it ran over it !!!!!!
Ill try with an old phone haha

 

[dee]

The rev counter on a 6170 works of the alternator.
Check to make sure it's charging correctly to start with

 

[alfapat]

The rev counter on a 6170 works of the alternator.
Check to make sure it's charging correctly to start with

Aye will do ,this old Hauwei phone is driving me crazy, I thought it was a sensor at the side of gearbox,well that was what the previous reply said .
Not this then, hopefully its where I was told it was.

 

[alfapat]

I can say , I was carting rubble 2 wks ago and it randomly appeared to work again , this is why I have ben prompted to check maybe loose wires.

 

[Mur Huwcun]

Aye will do ,this old Hauwei phone is driving me crazy, I thought it was a sensor at the side of gearbox,well that was what the previous reply said .
Not this then, hopefully its where I was told it was.View attachment 974598

That’s a form of pressure switch, apologies with the speed sensor, it must be 62 onwards that use the rear axle sensor then as they don’t have a W terminal on alternator and I was surprised to see rev counter still working when belt broke but was told later that they use the rear axle sensor.

 

[alfapat]

OK so youre saying that its the alternator that sends the signal. Wouldnt be sure how to test that apart from the fact that I can check charging , two other spade outlets I notice. Ill be back !Thank you.

 

[alfapat]

Removed and replaced the terminals on the alternator , the Wterminal could be one of two , one of them is a little black box on a 8mm nut , could this be the terminal to look at.

 

[alfapat]

7.2v from W TERMINAL. . Shall check dry connection if any at the back of Tacho .

 

[GHuggins]

Unless the 6170 is different from the rest it uses the sensor in the photo just beside what should be a hydraulic high pressure output outlet. It should be the sensor with the sheathing about a foot long in the above photo... I'll try to find a parts diagram for reference...

Found the pic - should also note that the other statement about charging voltage also should be correct - tach requires charging circuit if memory serves - to work...

 

[GHuggins]

Unless I'm not seeing the picture correctly - it should be the one about in the middle of the photo slightly to the left - might want to try washing everything off good with a pressure washer or something before digging in.

 

[Mur Huwcun]

Unless I'm not seeing the picture correctly - it should be the one about in the middle of the photo slightly to the left - might want to try washing everything off good with a pressure washer or something before digging in.

This one, and I was fairly sure it did the rev counter!

 

[alfapat]

Thats Fantastic , Ill clean down look for it . Very helpful Thank you.

 

[alfapat]

Hopefully cleaned enough to identify.
Would it be the one that you pointed out, I dont see the foot long sheath , or is that the wire protection?

 

[alfapat]

OH MY!
Now I need a RADIATOR, Best source please!!
I have used K Seal , seems to have done the trick for now if it lasts to getting Hay in Ill start looking.

 

[alfapat]

Tacho sensor , was a tad loose in its mount , as I was unable to view it properly as I have loader frame running past the area, I tightened what seemed like a nut .I checked for running and no luck , I then screwed the body in as the sensor has a magnectic pick up , to faintly feel a running shaft then screwed back a tad, this didny help so i am looking at a new one I think .

 

[Mur Huwcun]

You can unplug it and measure its resistance. Sorry but I don’t know what it should be though without digging a manual out. Someone on here may know?

 

[alfapat]

You can unplug it and measure its resistance. Sorry but I don’t know what it should be though without digging a manual out. Someone on here may know?

A job finding the plug , sensor. seems fixed to the cable as it was twisting while unscrewing and couldnt see it's joint or connector beneath the cab , looks like.