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Transmission cooler question.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by circle h, Jul 21, 2022.

  1. Jul 21, 2022 #1
    circle h

    circle h Light Load Member

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    I have a 2004 KW W900 daycab with a Cat C-12 and a rto16910cas2 transmission. I don't know the rear ratio of the top of my head, but in tenth I'm doing 1500 at 60. The truck previously did a lot of hours with a pto. I have removed the pto and am using it as a farm truck hauling grain. I was just about to pull the transmission and replace the clutch. It has a water to oil trans cooler. I suggested to my son that we change it to an air to oil cooler so we could never have a water in the transmission disaster. He asked why we would even have a cooler with the pto removed.
    So my question is do I need to have the cooler hauling 80k 20 miles and 30k coming back all day?
     
    circle h, Jul 21, 2022
    circle h, Jul 21, 2022
    #1
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  3. Jul 21, 2022 #2
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I bypassed mine cuz it sprung a leak. I just keep an eye on the temperature.
     
    Diesel Dave, Jul 21, 2022
    Diesel Dave, Jul 21, 2022
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    Bean Jr. and circle h Thank this.
  4. Jul 21, 2022 #3
    lester

    lester Midwest's #1 Feed Hauler

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    No you don't need a cooler
     
    lester, Jul 21, 2022
    lester, Jul 21, 2022
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  5. Jul 21, 2022 #4
    circle h

    circle h Light Load Member

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    Thanks for the answers. It took my kid to say "we don't have coolers on any other trucks" for me to think about it. Simple is better in my mind.
     
    circle h, Jul 21, 2022
    circle h, Jul 21, 2022
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    Bean Jr. and Diesel Dave Thank this.
  7. Jul 21, 2022 #5
    kranky1

    kranky1 Road Train Member

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    I’d think the only time that transmission would build up any amount of heat would be loaded in overdrive for hours on end. Watch the temp but you should be fine with no cooler.
     
    kranky1, Jul 21, 2022
    kranky1, Jul 21, 2022
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    Big Road Skateboard and circle h Thank this.
  8. Jul 22, 2022 #6
    Brettj3876

    Brettj3876 Road Train Member

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    No you don't. Those short trips it won't even get above 130 I bet. I don't have a cooler on a RTOO 14613 and even in the big hole it will stay about 190-195 on a hot day running up around gross
     
    Brettj3876, Jul 22, 2022
    Brettj3876, Jul 22, 2022
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    circle h Thanks this.
  9. Jul 22, 2022 #7
    circle h

    circle h Light Load Member

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    Thanks for the input. I am going to eliminate the water side of the cooler. It will be easier than removing it altogether.

     
    circle h, Jul 22, 2022
    circle h, Jul 22, 2022
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    Big Road Skateboard Thanks this.
  10. Jul 22, 2022 #8
    armo

    armo Light Load Member

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    bud nobody can answer to your question. buy trans oil temp gauge kit and install it. monitor readings and you will find out cooler is needed or not...
     
    armo, Jul 22, 2022
    armo, Jul 22, 2022
    #8
    circle h Thanks this.
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