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D6T Getting Hot

Discussion in 'Dozers' started by Mark S, May 5, 2022.

  1. Mark S

    Mark S Active Member

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    Here is the situation I am running into.
    2010 D6T, 8,700 hours. I am pushing sand and lots of it.

    all fluid levels ok.

    I bought the machine used and it came out from a fly ash operation.

    I have cleaned/lightly power washed the radiator multiple times and have removed a lot of fly ash chunks that were in between the radiator fins.

    the machine runs great for about two hours. Temp levels stay consistent. Then, after about 2.5 hours the machine temps get to the large tick on the gauges and then goes above them. If I’m pushing and running the machine they just keep going up. Temps are never in the red, but they also can’t bring themselves down unless I idle the machine for 15 minutes. I can run for about 20 minutes and up they go again.

    could this be due to more blockages from the ash or something else?

    thanks
     
  2. Vetech63

    Vetech63 Senior Member

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    Post your serial number of the machine. Have you checked anything yet other than what you have done with washing out the core?
     
    mg2361 likes this.
  3. Mark S

    Mark S Active Member

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    KJL01125

    I have not checked anything other than what I mentioned.

    I forgot to mention that both temps start to get hot, both engine and transmission.
     
  4. Nige

    Nige Senior Member

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    When you say “idle the machine for 15 minutes” that is at low idle speed, correct.? Have you ever tried running the engine in neutral at about 1500rpm or so.? How fast do the temperatures come down then.?

    Also have you had the belly guards down and cleaned underneath the engine and transmission.? If that machine was operated in fly ash it probably is long overdue a clean downstairs.
     
    nicky 68a, mg2361 and Vetech63 like this.
  5. Nige

    Nige Senior Member

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    The more I think about it the more I suspect that your problem could most likely be a lack of air flow through the cooling package, because not only do you have the radiator cores in there but also air-to-air coolers for the powertrain oil and the hydraulic system as well. If you have A/C the condenser is probably shoehorned in there somehwere as well.

    I can't help but think that at some point the hardnose will have to come off and the whole cooling package will need to be disassembled to clean it, but let's try every possible avenue short of doing that first.
     
    nicky 68a and DB2 like this.
  6. Mark S

    Mark S Active Member

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    I was referencing low idle when I said idle.

    I tried the 1500 rpm in neutral and it didn’t seem to help much.

    Do I have to remove the belly pan to clean in there or do I stick a power washer in there to try and clean it?
     
    Vetech63 likes this.
  7. Nige

    Nige Senior Member

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    That seems to suggest a possible air flow (as in lack of) issue. Do you have access to an infra-red (non contact) thermometer.?
    I would remove them if it was mine because your tractor has sealed bottom guards. What you can do pressure washing down the side of the engine will be extremely limited. There are a total of 3 pieces that need to come down, from the front right the way back to the one under the rear gear case at the back end of the machine, and they will be heavy with accumulated dirt so you need to be VERY careful with them. The front two are pivoted on one side and can be tilted down using a lever puller hoist from above so they won't have to come right off to get them clean.
     
    nicky 68a, Vetech63 and ugis like this.
  8. Mark S

    Mark S Active Member

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    I looked into the belly pans through the space up front and they look clear and clean.

    I also took a video of a belt from the fan that goes over to some type of mechanism next to the oil filler tube. It seems as though the belt is slipping on this item. Would that be contributing to this issue at all?

    again, I apologize for my lack of knowledge, this is my first dozer.
     
  9. Nige

    Nige Senior Member

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    Can you take some photos of the inside of the belly pan so we can all see.?
    Also please post a photo of the belt that you are referring to.
     
  10. Mark S

    Mark S Active Member

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    I can try and get photos of the pan tomorrow.

    I’ll try to attach a photo of the belt I’m referring to.
    209577BD-1E26-4529-B6DF-9B6BC1CA7C63.jpeg
     
  11. Nige

    Nige Senior Member

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    That’s the aircon compressor belt. It doesn’t drive the radiator fan. I think the main radiator fan is hydraulic drive, let me check.
     
    Vetech63 likes this.
  12. Mark S

    Mark S Active Member

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    The hydraulic temp never gets too hot.

    on the radiator itself, I see three different types.

    is the one in the engine compartment on the right side looking out the hydraulic radiator? That’s pretty clean.

    then if I look in the front grills, there’s one type of radiator on the left, is that the transmission? It’s maybe 12” wide or so.

    then in the middle and to the right of the front, is that the engine radiator?

    I thought I came across a cooling system picture on here, but it wasn’t exact to my machine.
     
  13. Nige

    Nige Senior Member

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    It’s difficult to find a single drawing that shows all the elements of the cooling package unless it’s for training purposes and I don’t have that. Again if you post a photo I can annotate it for you.

    As I asked above do you have an infra-Red thermometer.?
     
    Delmer and Vetech63 like this.
  14. ahart

    ahart Well-Known Member

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    Might check the temperature drop across the powertrain cooler, if it’s heat soaking the cooling system, it will have a hard time keeping up. If that turns out to be the case you will need to run the machine until the overheating begins and check torque converter inlet/outlet pressures along with transmission lube pressure. Certainly sounds like your powertrain is generating heat faster than your cooling system can get rid of it. Remember, the transmission temp on the dash is referring to the torque converter outlet temp. This is the temp of the oil entering the cooler.
     
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  15. ahart

    ahart Well-Known Member

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    Also, looking at the front of the tractor through the grille, the far left core is your aftercooler, all the ones to the right of it are radiator cores. On the inside by the fan guard is your hydraulic cooler, the powertrain cooler is mounted under the turbocharger on the right side of the engine block.
     
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  16. Nige

    Nige Senior Member

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    I know we had all sorts of issues with our D6Ts keeping the radiators clean. What can look clean from the front of the tractor looking through the grille or from the engine compartment looking forward was not the whole story. The areas behind the baffle indicated by the 4 arrows were favourite spots to get full of material that severely restricted airflow through the radiator.
    upload_2022-5-6_1-22-53.png
     
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  17. Mark S

    Mark S Active Member

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    I don’t have a thermal temp gauge. It I can get one.

    should I take the temps in different places? Any temp I’m looking for?
     
  18. Mark S

    Mark S Active Member

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    Would it be ok if I ran the dozer until it got hot, then idle it down to cool, and hop in the excavator to use that for a couple hours. Then hop back in the dozer for an hour or two?

    that’s until I can get it fixed. We’re under a time crunch and can’t get the dozer in the shop at the moment.

    what damage am I possibly doing if I take it up to hotter temp but don’t run it there?
     
  19. Nige

    Nige Senior Member

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    Take the temps of the hoses connected to those two big tubes shown coming out of the bottom of the radiator in the illustration above. The one on the left side of the tractor is the inlet, the one on the right is the outlet..
     
    Vetech63 likes this.
  20. tctractors

    tctractors Senior Member

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    This Tractor looks like it could do with a Good Service and all the panels and grill plates stripping then steaming out, your fuel filter looks to be full of puss, if you cannot see light through the cooler fins then wind off the fan is not removing any heat, the dirt pegging is near always greatest on the lower right hand side looking in through the side doors, a temp gun is handy but if the rad is pegged a bit of rag used as a flag waved about with the fan running at 3/4 speed will tell you a lot on air movement, the low idle cooling better than at half speed is not the common thing so this needs checking for more detail, if you have a heat gun the top to bottom of the radiators can be checked all points of a compass with often an 8 -10 deg change, washing out with a steam cleaner often gets the best results but guards etc need to be stripped off first, to pull off the nose group you will need metric bolts to draw the nose pins. tctractors
     
    John C., nicky 68a, oarwhat and 2 others like this.