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  1. #21
    Veteran Member MHarryE's Avatar
    Join Date
    Feb 2009
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    1,486
    Location
    Northeastern Minnesota
    Tractor
    JD 7720; Kubota M135GX, NH TS115A; JD 6230; Kubota L5740

    Default Re: John Deere 4720 temperature gauge problem

    Running hotter because of Tier IV should not be a response. They could easily put in a temperature gauge calibrated to run with the needle at the vertical position even with a new thermostat setting. The important thing, however, is that you worked the tractor hard under load and the needle didn't move. That is the best indication there is no problem but there is a lower margin of safety so you might overlook the needle climbing into the red as your radiator begins to get covered with crap from shredding. My kubota has a LCD bar graph display and it is easy to miss the temp climbing. I have caught myself a couple times with all the bar segments lit except the high temp. They should have a light at that point like in the cockpit of the airliner in Airplane - "A Little Hot". Like when my bar graph on the fuel gauge drops down to 1 segment it changes to Low Fuel. When it drops that last bar it should say "You're Screwed" but instead the engine dies.
    JD7720; KubotaM135GX; NH TS115A; JD6230; KubotaL5740

  2. #22
    Gold Member eagle107's Avatar
    Join Date
    Jul 2011
    Posts
    357
    Location
    NY
    Tractor
    John Deere and New Holland/Ford Tractors

    Default Re: John Deere 4720 temperature gauge problem

    Quote Originally Posted by MHarryE View Post
    Running hotter because of Tier IV should not be a response. They could easily put in a temperature gauge calibrated to run with the needle at the vertical position even with a new thermostat setting. The important thing, however, is that you worked the tractor hard under load and the needle didn't move. That is the best indication there is no problem but there is a lower margin of safety so you might overlook the needle climbing into the red as your radiator begins to get covered with crap from shredding. My kubota has a LCD bar graph display and it is easy to miss the temp climbing. I have caught myself a couple times with all the bar segments lit except the high temp. They should have a light at that point like in the cockpit of the airliner in Airplane - "A Little Hot". Like when my bar graph on the fuel gauge drops down to 1 segment it changes to Low Fuel. When it drops that last bar it should say "You're Screwed" but instead the engine dies.
    Mine looks just like "YesDeere's" picture. As soon as the needle hits the tip of the red area, the warning light starts blinking on the dash and the LCD states "Hot Temp" if I remember correctly. This only happened to me once when brush hogging and all the air vents got clogged with debris.
    John Deere and New Holland/Ford Tractors and stuff

  3. #23
    Veteran Member YesDeere's Avatar
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    Dec 2008
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    1,135
    Location
    Merland
    Tractor
    04/4310

    Default

    Now this is after roto-tilling for half an hour on my 4310. Just a different beast. I'm glad of this thread for my new attention to the temp.
    Attached Thumbnails Attached Thumbnails -image-43589490-jpg  

  4. #24
    Platinum Member
    Join Date
    Jan 2010
    Posts
    500
    Location
    East Coast
    Tractor
    JDs:

    Default Re: John Deere 4720 temperature gauge problem

    My 2011 4720 runs the same way. I had a 3720 that never went over the middle range and raised the same consern to this site when i first ran my 4720...it seems I got the same answer and "it's normal". i have close to 200 hours and it runs to the hot side but have not had any problems. i did have the red "hot temp" light and "STOP" come on once, but that was my fault due to very clogged radiator and ac units...clean out and it's running fine...the ac was much better after the cleaning as well

  5. #25
    Veteran Member YesDeere's Avatar
    Join Date
    Dec 2008
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    1,135
    Location
    Merland
    Tractor
    04/4310

    Default

    I used a bottle brush on my fathers 4720 this weekend. Kind of an ill design no removable screens.

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