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  1. #1
    Gold Member acme97's Avatar
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    May 2011
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    326
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    Cottageville, SC
    Tractor
    Kubota L35, Kioti DK50SE

    Default DK50HST Running Hot

    Today, I was doing some light work around the place - moving brush, stumps to a burn pile when I noticed the tractor was running close to red. I wasn't running hard, maybe around 1500 rpm, outside temp was about 80, had AC on. I stopped the tractor and let it cool off. Checked the screens (had a little) build up, cleaned it off and went back to work. Probably 15 minutes later, was hot again. So let cool down and moved to parking area for day. Any ideas why it would be heating so fast? Didn't see any fluids leaking etc.

  2. #2
    Platinum Member DieselMonk's Avatar
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    Dec 2004
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    583
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    Nova Scotia
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    New Holland / T4.75 Powerstar & Boomer 1030, Case 580 SM II

    Default Re: DK50HST Running Hot

    fan belt lose?

  3. #3
    Gold Member acme97's Avatar
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    May 2011
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    326
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    Cottageville, SC
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    Kubota L35, Kioti DK50SE

    Default Re: DK50HST Running Hot

    Quote Originally Posted by DieselMonk View Post
    fan belt lose?
    No, not that I noticed. I'll have to double check to make sure. I plan on checking the coolant also, but with only 41 hrs on it, I figured that would be to specs.

  4. #4
    Platinum Member ritcheyvs's Avatar
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    Nov 2011
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    754
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    Kittrell, NC
    Tractor
    Kioti DK45S

    Default Re: DK50HST Running Hot

    It may be cliche, but if you have coolant, the radiator isn't blocked, and the fan and pump are turning; thermostat is about all that's left.
    Scott
    Kioti DK45S, KL451 loader, Howse 601S cutter, Phoenix M72S mower, Deere BB5072 Box Scraper, Fit Rite Hydro Top Link

  5. #5
    Elite Member MotorSeven's Avatar
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    Aug 2005
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    3,850
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    NE TENN (Hancock Co)
    Tractor
    Kioti DK40SE Hydro

    Default Re: DK50HST Running Hot

    Make sure the pre-screen(s)-there are two- on the radiator are clean. Then look between the oil cooler and the radiator for a mouse house..... you have to really contort yourself to check that. I chased a mild overheat thing for a couple of days before I found the nest because you can't see that area very easily.
    2008 KIOTI DK40Se Hydro
    1978 Sling Blade/wood handle

  6. #6
    Gold Member acme97's Avatar
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    May 2011
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    326
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    Cottageville, SC
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    Kubota L35, Kioti DK50SE

    Default Re: DK50HST Running Hot

    Quote Originally Posted by MotorSeven View Post
    Make sure the pre-screen(s)-there are two- on the radiator are clean. Then look between the oil cooler and the radiator for a mouse house..... you have to really contort yourself to check that. I chased a mild overheat thing for a couple of days before I found the nest because you can't see that area very easily.
    Good point, I did clean the screens, but didn't see a mouse nest so to speak. I think I'll take a closer look and use the compressor to blow things out, or the shop vac.

  7. #7
    Elite Member Coyote machine's Avatar
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    May 2009
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    4,246
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    Southern VT
    Tractor
    '10 Kioti DK 40se/hst KL-401 FEL, loaded tires, KB-2485 bhoe, Tuffline TB160 boxblade, Woods QA forks, MIE Hydraulic bhoe thumb & ripper tooth, Igland 4001 winch, & GR-20 Log Grapple. Woods BBX72" Mower. Diamondplate aluminum canopy.

    Default Re: DK50HST Running Hot

    The thermostat could easily be a problem if it's stuck closed and doesn't open on temp being reached. Here's what I'd do. Before starting it, AFTER checking radiator fluid level, and expansion tank fluid level run it lightly up to normal operating temp. See if it comes to normal range on gauge. Keep the AC off for now while diagnosing. Check to see if there is any fluid in the expansion tank after running it up to 'normal' temp. If whatever fluid was in the ex tank is now gone the radiator has sucked it up. Carefully, with a rag on the radiator cap and with gloves on your hands turn the rad cap 1/2 turn and see if there is any pressure or fluid wanting to escape from beneath the cap. If so, then let her cool to ambient temp and then remove the cap and recheck fluid level. Then you can try running it with the radiator cap off at idle and see if there is noticeable flow of coolant in the radiator. If not then the t-stat is probably not opening, and replacing it would be a good place to start. Once you remove the stat you can drop it in 180+ degree water and see if it opens or stays shut.
    There are two other things that might be wrong- the gauge or its temp sender could be reading wrong, but considering the 80 degree ambient temp and using the AC I suspect not on these items.
    Try to assume nothing and if you can't find the solution DO NOT use the tractor until you do find the cause. It is unlikely with the low hours that it's a head gasket, but anything can happen. Some 50HP Kioti's had a head gasket problem- but I can't recall which particular series/model at the moment. Maybe someone else can chime in on this....
    2010 DK-40se/hst, Kioti KL-401 FEL, (with reversible Kioti cutting edge), 72" Ratchet Rake. Fit Rite Top-N-Tilt hydraulics & diverter valve. HLA Series 2000 7' snowplow, Aquiline MPC rear chains.

    Scag Wildcat: Kawasaki 26HP, with bagger system. Dr. brush mower, & 42" lawn deck, Dr. self propelled, 6.5HP Trimmer mower. Pro-Mow 3 gang mower, no HP.

    Bunch of STIHL chainsaws: 011x 2, MS192T, MS200T, MS180C, MS230, MS270 (Wood Boss), 038 Farmboss, '86 anniversary edition.

  8. #8
    Super Member grsthegreat's Avatar
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    Jan 2011
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    6,428
    Location
    north idaho
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    dk45se hst cab

    Default Re: DK50HST Running Hot

    i second the cleaning of the radiator fins and front grills, screens.

    I have seen this same thing happen to my tractors.... especially after mowing the fields.

    caution needs to prevail so you dont damage fins of radiator.
    currently own
    2011 Kioti DK45SE HST CAB tractor/loader, Jimna 6" - 3 point wood chipper, 60" JD Brush Hog, JD 60" Rototiller, 3 point post hole digger with hydraulic assist, 3 point spring tooth rake, Fimco 55 gallon weed sprayer with 12 foot boom, 3 point hydraulic wood splitter (home built)
    Quick Attach 79" loader mount snowblower & rear powerpack
    Quick Attach 84" Snow Blade
    Quick Attach 42" pallet forks

  9. #9
    Gold Member acme97's Avatar
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    May 2011
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    326
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    Cottageville, SC
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    Kubota L35, Kioti DK50SE

    Default Re: DK50HST Running Hot

    Good advice on all the options. Unfortunately it'll be a few weeks before I'm back to the place. Now working out of Jacksonville! If you guys think of any more things just yell them out. K

  10. #10
    Bronze Member LastSTRAW's Avatar
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    May 2011
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    Nova Scotia
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    Kioti DK50SE with Cab, Ford 4610, Ford 2110, Ford 860, Hough Payloader, 1945 International Bull Dozer

    Default Re: DK50HST Running Hot

    It shouldn't happen on a new tractor but check your oil just in case. My neighbour's 4600 was overheating last year. He couldn't find a coolant leak until he checked the oil and found lots of it there. Had to replace to head gasket at $$$$$.

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