Snow 1998 jd 5210 temp gauge problem

[nelg]

I have a 1998 jd 5210. It has a problem with the temperature. When I go out in the morning to start it the temp hand goes halfway as soon as I turn the key to the on position. I have replaced the thermostat and the temp sensor. It does not do it all the time, maybe a short in the system. Is there an after market individual temp gauge that would work. Any thoughts are welcome. Thanks. Nelg

 

[JD5210]

Temperature sender is a variable resistor that responds to changes in coolant temperature. Low coolant temperatures cause high resistance. High temperatures cause low resistance.

Here is some test you can make. All should be made with the engine OFF and the key in the run position. Connect wire from temperature sender to ground using a jumper wire. Gauge should indicate HOT. Unplug the sender wire and the gauge should indicate COLD. If this test fail you will need to test the wiring and the cluster. At this point I disconnect the negative cable on the battery and Ohm test the wire from the sender to the cluster.

I have attached a copy of the wiring diagram.

Insure the ground on the front wiring harness is clean.

 

[nelg]

thanks for the help. problem solved.

 

[ckesey]

I'm a little late to this thread but I'm having the very same issues with my 5210. Is the temp sensor towards the back of the engine on the top? Do you know what this sensor should (ohm) read cold? When I unhook what I think is the correct sensor (with key on engine off) the guage goes to far end (cold).

 

[JD5210]

The coolant sender is located in the back of the engine on top. The ohm is

60 C (140 F) 134 ± 13.5 ohms
90 C (194 F) 51.2 ± 4.3 ohms
100 C (212 F) 38.5 ± 3.0 ohms

 

[ckesey]

Thanks for the help here. Taking the connector off will cause the gauge to go to the far left (as if tractor is cold) and shorting it to ground causes the gauge to go to the overheat position.

I've ordered a new water temperature sensor part number RE51774.

Hopefully this will correct my issue.

Thanks again.

 

[ckesey]

Ok....picked up a new sensor today but after installing the problem hasn't changed. When I turn the key on (70 degrees outside and not been started all day) the handle goes directly to the middle.

I messured the old one from the spade connector to threads and it ohms out at 490. Again this is out of the tractor at aprox 70 degrees.

Any ideas what I can can check next?

 

[JD5210]

The ohm readings I posted came out of the tech. manual (TM1716). Make sure where the negative battery cable attaches to the frame is clean, when I purchased my tractor the temp gauge was bouncing around until I cleaned the connection.

Any chance you have some old electronics laying around that you take a resistor from and put it in place of the temp. sender? There are a number of tables on the net to match colors to resistance. Lets hope the problem is not in the cluster.

Low chance this is the problem, put you could check the wire from the sender to the cluster, by ohm testing it, should be 0. First remove the negative battery cable at the frame, it is easier to get this off then the connection at the battery. If you take off the panel the key switch is on, then the left cowl, you should be able to reach in from the side and pull the connector off, it will be the large connector.

Do NOT remove the cluster, I only say this because if you do not tighten the screws that hold the cluster in place correctly you might break the glass.

 

[ckesey]

I will try what you suggest but it will need to be daylight before I can begin.

I ran the tractor a little while to get it up to temp. At 155ｰ from the brass threads to the spade connector it reads 80 ohms of restance.

 

[ckesey]

The instrument cluster wasn't as hard as I thought to pull out. I pulled the bigger connector from the back of the pannel and tested the white and black wires (next to each other in the harness. They tested 145 ohms (tractor has cooled off a bit so I would think this is normal. I pulled the connector on top of the sensor on the engine and these two (white and black wires at the back of the instrument cluster) went open. To me this would confirm the wires and sensor are reading to the back of the cluster. Would you agree? When I put the harness back in it buries the needle in the red.