My new 4550 temperature gauge not working

Chuckk · Jan 5, 2016

They delivered my new 4550 with FEL a few days ago. So far I have put about 7 hours on it.
every thing seems good so far except the temperature gauge appears not to work I removed
and reconnected the wire to the sensor still no go. Any one have a test procedure for the
sensor and or the gauge so that I can try and narrow it down and have the dealer order the correct part.

JMC68301 · Jan 6, 2016

Hi ChuckK,

I am curious how you know that the temperature gauge is not working. I ask because I have same question on my mPower75 with 25 hours on it I have not seen the temperature gauge move this winter with - maybe just a hair's width up after a long time running - but not sure.

Jabonee · Jan 6, 2016

If this is a new tractor your talking about I would call the dealer and have them look at it. Its under warranty!

Chuckk · Jan 6, 2016

Well I ran pretty hard for about 3 hours to see if the gauge would come off the peg and it never moved.
So something is not working

Chuckk · Jan 6, 2016

Well just trying to save a trip back to the dealer and then they will still have to order a part.
Thought there might be someone on here that could point me in the right direction with a test procedure.

Jabonee · Jan 7, 2016

It's a 5V system that signals the ECU if I read the service man. correctly. Don't know how you could apply 5v to it to see if you could peg the gauge. Sensor varies the resistance.:confused3:

Chuckk · Jan 7, 2016

Thanks, I did a few tests today first I took my 12v test light and connected it to the wire from the sensor and and ground the light lit up so that tells me the sensor is is getting voltage. So then I touched the sensor wire to ground and temp gauge started to go up so I think every thing is working but the sensor. I then took my Fluke and measured the resistance of the sensor cold 2.2k after running the tractor for about 45 min I checked the sensor
again read .8k. Spoke to the dealer and he is going to order the sensor

So Does the manual you have show resistance spec of the sensor.

Jabonee · Jan 8, 2016

Yes it has a sensor profile but I have no idea how to read the symbols. My best guess is 5 ohm @ 0 degree C and 50 ohm @ -40 C. Like I stated I have no idea how to interpret the graph and symbols. Maybe your dealer can copy that page and Fax it to you.:confused3:

kevin37b · Jan 8, 2016

If I was you I would leave it alone . This a 7 hr tractor ? I would never **** with a dealer that will charge for pu / d on a new machine ! WARRANTY

jb1390 · Jan 8, 2016

Chuckk said:
They delivered my new 4550 with FEL a few days ago. So far I have put about 7 hours on it.
every thing seems good so far except the temperature gauge appears not to work I removed
and reconnected the wire to the sensor still no go. Any one have a test procedure for the
sensor and or the gauge so that I can try and narrow it down and have the dealer order the correct part.

You need to call your dealer and have them contact Mahindra about this. Some of the Tier IV models do not warm up correctly. I have a thread regarding some of my experiences with my 3550. I suspect your gauge is working correctly, but you need to measure coolant temperature using another sensor - such as a thermocouple- to verify this.