5065e Tachometer unstable?

[Rmiked]

I am Rmiked but was rmd8136. The site would not let me log on and would NOT send new PW so I created new acct with different email. Anyway, my 2013 Tier 2 tractor has been great. This week the tachometer started bouncing around. Tx Jim told me where the speed sensor was (timing gear cover). I pulled the electrical connector and it looks fine. I removed the sensor and it looks fine. My dealer is telling me it is usually the instrument panel with moisture damage. My tractor had the fogging up of instrument panel ever since new. There was no recall on my tractor based on serial number. Replacing the sensor is a $35 part and easy to do. Does anyone know what the resistance reading of a good sensor is? My Regional Service Mgr said he would pay for the part ($695) and service call if I paid for labor which is 2-3 hours at $110/hour. Does anyone have any advice? If I paid for all of it I would spend 1100-1200 to get a stable tachometer which is too much. Would be nice if just bad sensor but dealer says usually a sensor does not fail in an erratic way? Thanks in advance for any advice.

 

[LouNY]

If it is a proximity sensor they can be tested.
One way would to be get a couple of conductive extension leads into the connector (straightened out paper clips?) and using a multi-meter with a frequency read see it it is getting a steady reading that varies with engine speed.
Also some times you can manually make them read by rapidly moving them back and forth or a piece of steel, do not hit the steel though.

 

[Rmiked]

I believe it uses a magnet to detect speed. The sensor looks like a metal cylinder. I don’t know if it can output a signal without being connected to power. I’m guessing one of the 2 wires on the electrical connector runs thru the fuse block somehow. But I could easily measure the resistance across the sensor with the wiring unplugged. I just don’t know what a good reading is.

 

[Tx Jim]

I forgot to instruct you to check/tighten the instrument panel ground connection.

 

[Rmiked]

Where is that ground connection? Do you need to remove instrument panel to access it?

 

[BrokenTrack]

I am Rmiked but was rmd8136. The site would not let me log on and would NOT send new PW so I created new acct with different email. Anyway, my 2013 Tier 2 tractor has been great. This week the tachometer started bouncing around. Tx Jim told me where the speed sensor was (timing gear cover). I pulled the electrical connector and it looks fine. I removed the sensor and it looks fine. My dealer is telling me it is usually the instrument panel with moisture damage. My tractor had the fogging up of instrument panel ever since new. There was no recall on my tractor based on serial number. Replacing the sensor is a $35 part and easy to do. Does anyone know what the resistance reading of a good sensor is? My Regional Service Mgr said he would pay for the part ($695) and service call if I paid for labor which is 2-3 hours at $110/hour. Does anyone have any advice? If I paid for all of it I would spend 1100-1200 to get a stable tachometer which is too much. Would be nice if just bad sensor but dealer says usually a sensor does not fail in an erratic way? Thanks in advance for any advice.

My Kubota did this once, and it is where the needle attaches to the gauge. I just tightened the teeny-tiny screw inside the gauge. This is a very common problem on Kubota's.

This may NOT be your issue...I am not sure, but it would only take a second to rule as a possible cause or not. I just mentioned it in case it was a simple fix for you.

Edited to Add: I had problems logging in the last few days as well, so it was not your account, it was a problem with TBN for some reason. My account is now fine.

 

[duckduke]

On my 5425 you can walk right up to the side of the tractor and look at the ground (you do have to bend over and break your neck a little). Walk up and look at the wall of the housing to side of the brake pedals (the inside housing below where the instrument panel is). It will be slightly above the height where your foot hits the brake pedals.

If its not there it may be up in there behind the instrument panel.

With it tach bouncing ……... it 'could' be the ground (it would be a good day if it is!!).

 

[Rmiked]

duckduke, thanks for advice. That would be an easy fix! I will look for a ground wire terminated to frame near the brake pedals.

 

[jd110]

If you have an ohmmeter, you can check the continuity to ground by disconnecting the sensor and connect one ohmmeter lead from black wire on sensor lead to the tractor frame. While connected, wiggle wire harness to see if reading changes. If you also have an A/C voltmeter, connect both leads to the sensor and start engine. You should get a low voltage reading around 1 - 3 A/C volts. See if you get a steady reading at steady rpm. if voltage reading is jumpy, then sensor is most likely at fault.

 

[Rmiked]

If you have an ohmmeter, you can check the continuity to ground by disconnecting the sensor and connect one ohmmeter lead from black wire on sensor lead to the tractor frame. While connected, wiggle wire harness to see if reading changes. If you also have an A/C voltmeter, connect both leads to the sensor and start engine. You should get a low voltage reading around 1 - 3 A/C volts. See if you get a steady reading at steady rpm. if voltage reading is jumpy, then sensor is most likely at fault.

So if the ohm-meter reading changes while wiggling the wire, the ground at the instrument panel is loose? If true, then I need to make that connection 渡ot loose? Do you know where the instrument panel ground connection is located ? I have not been back to my farm where tractor is located but will tomorrow but another member said his 5425 ground was near brake pedal. BTW: just ignore the other wire (not black wire) when connecting ohmmeter to black wire?

If the sensor is reading jumpy , tractor running but disconnected from tach, then a simple sensor replacement will work.