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  1. #11
    Silver Member mowin's Avatar
    Join Date
    Sep 2012
    upstate ny
    JD 3320

    Default Re: 790 JOHNDEERE

    I'm not too far from ya, and It was cold yesterday. Wouldnt be suprised if the tractor never got warm enough for t-stat to open...

  2. #12
    Epic Contributor RoyJackson's Avatar
    Join Date
    Nov 2001
    Bethel, Vermont
    John Deere 4520 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: 790 JOHNDEERE

    Quote Originally Posted by crashz View Post
    My 770 does the same thing. I replaced the thermostat, coolant, temp sensor and hoses. Still, it only creeps up to about 1/4 of the way when working in the summer.
    My 790 was the was my old Deere 670 and my current Deere 4400. All ran cool (about 1/4 in the green) even when mowing, brushcutting or chipping at PTO RPM
    Roy Jackson

    "There ain't no such thing as a free lunch..."

  3. #13
    Veteran Member crashz's Avatar
    Join Date
    May 2005
    NH & Upstate NY
    John Deere 770, Kubota L2501


    I should mention that I replaced that stuff to eliminate the added heater from the previous owner and for PM. It is an early model (1989) 770, and I wanted to make sure the cooling system was well maintained.

    The previous owner installed a heater into a homemade cab (Extremely Thrifty) and temps would never even register on the gauge. The heater, which was fed from the tapped radiator hoses, was about 1/2 the size of the radiator and would barely get warm to the touch. I felt that this was bad to run the tractor so cold ( would consistently smoke at idle) so I removed the heater and everything else besides the canopy. Once the cooling system was returned to stock with new parts, the tractor began running better and quit smoking.
    I've had a wonderful evening, but this wasn't it. ~ Groucho Marx

  4. #14
    New Member
    Join Date
    Feb 2013
    schoharie ny
    johndeere 790 compact

    Default Re: 790 JOHNDEERE

    Thanks guys

  5. #15
    Veteran Member Hooked_on_HP's Avatar
    Join Date
    Dec 2005
    Coal City IL
    Ford 1900 FWD Kubota F2100E

    Default Re: 790 JOHNDEERE

    The hot water from the engine returns to the radiator through the top hose, passes through the radiator and is pumped back through the engine through the lower hose. So if your cooling system is working correctly the lower hose should be a lot cooler than the upper.

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