TM2370CD for Serial #770631

jcalla · Jan 30, 2019

Where do I find TM2370CD for my 4720 serial #770631? The highest number available is up to 650000.

JPC

arlen4720 · Jan 30, 2019

About what year? Is it a cabbed unit?

jcalla · Jan 30, 2019

2010 w cab

arlen4720 · Jan 30, 2019

Ok. I have a manual for that era of open station machine...not one for cab

pipsqueek · Jan 31, 2019

Link shows w/o Cab, but if you click thru, has both with and without cab

John Deere Operator Manual | Parts & Services | John Deere US

TM105419CD for 4720 is correct CD

John Deere Operator Manual | Parts & Services | John Deere US

Also online manual show for 4720 PIN(670001-) and above, so includes 770631, with and without cab, page also has print function.

OMLVU19619_E9

jcalla · Jan 31, 2019

Arlen4720,
Could you possibly post the pages of the TM2370 that show glow plug theory of operation, wiring diagram and troubleshooting?

Thanks,
JPC

arlen4720 · Jan 31, 2019

This should help. It is pages from 3 different sections. Good Luck. Not a good time for glow plug problems.

jcalla · Jan 31, 2019

This is good. I assume this covers my 2010 4720 even though I have a cab. My tm2137CD that was sold to me when I bought the tractor, covers earlier version of 4720 not mine. Would it be possible to email me the complete CD so I can search through it and see the color code if the circuits? I would gladly pay you for it.

JPC

jcalla · Jan 31, 2019

I see where aid goes directly to K5 which is working fine, however I am trying to find which wire goes to the display with the switch in run and is supposed to light up the indicator light. It looks like it would be wire 4 or 5 from the switch that powers the display in run. PDF file came in black & white so I can't tell which circuit it is. Could you tell me what circuits 472A and 072A are? Do you have the other part of the schematic that shows where power goes in and out of the display?

Thanks
JPC

arlen4720 · Feb 2, 2019

jcalla said:
I see where aid goes directly to K5 which is working fine, however I am trying to find which wire goes to the display with the switch in run and is supposed to light up the indicator light. It looks like it would be wire 4 or 5 from the switch that powers the display in run. PDF file came in black & white so I can't tell which circuit it is. Could you tell me what circuits 472A and 072A are? Do you have the other part of the schematic that shows where power goes in and out of the display?

Thanks
JPC

Wire 383 coming of the load side of the contacts is the one that goes back to the ICC to tell it when glow plugs are active. Wire 385B that is landed on the coil of the relay is coming from the engine computer. That is the one that fires the glow plug relay automatically when it is cold. 385A is coming from the manual switch to fire glows manually.
If glow plugs are working (manual and auto) and it is just the lite not illuminating, then investigate wire 383. Where it lands on the ICC is detailed in the pdf that I attached.
Good luck

jcalla · Feb 2, 2019

Great info! So 383A coming off the load side of the relay goes to the display to feed the indicator light. Could you post the next page of the wiring diagram so I can see which connector and wire it is at the back of the display to check for voltage?

Thanks

arlen4720 · Feb 2, 2019

As I indicated in my last post, the pdf that I attached details where that wire lands on the ICC.
Look at page 5
Good luck.

jcalla · Feb 3, 2019

I checked 383org to the display. It has voltage when relay is powered, but indicator light and message still does not come on. Which is the ground wire coming out of the display panel? Could you post the second page of the wiring diagram?

JPC

arlen4720 · Feb 3, 2019

jcalla said:
I checked 383org to the display. It has voltage when relay is powered, but indicator light and message still does not come on. Which is the ground wire coming out of the display panel? Could you post the second page of the wiring diagram?

JPC

Here you go...
Unfortunately it sounds like your ICC is faulty. You would no doubt have other issues if you were missing one of the 2 grounds. I would appreciate it if you report back with your findings.
Good luck