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239D cooling issue

Discussion in 'Compact Track/Multi Terrain Loaders' started by jrtraderny, Jun 12, 2019 at 3:34 AM.

  1. jrtraderny

    jrtraderny Well-Known Member

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    I've got a Cat 239D with just over 900 hrs on it , recently it's been running warmer than normal in the 203 - 208 degree range. It has the variable speed hydraulic fan that doesn't seem to be spinning fast enough to move enough air through the radiator. I've pressure washed the radiator multiple times to be sure it's clear now if I unplug the solenoid on the fan motor it will spool up and cool just fine any suggestions on how to test the solenoid or just replace it ? Also have been told that the hydraulic fan motor may need to be calibrated, any feedback on that ?
    Thanks,
    jr
     
  2. 92U 3406

    92U 3406 Senior Member

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    There's a fan speed spec for those hydraulic fans. I've had to calibrate a couple of them. You need a digital tachometer to read the fan speed. If its out of spec then you'll need CAT ET to run the fan speed calibration.
     
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  3. Vetech63

    Vetech63 Senior Member

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    You may want to pull that solenoid valve and make sure it isn't stuck partially open. Had that on a 299d
     
  4. KSGENE

    KSGENE Member

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    I actually just went thru this mess with my 259D. I had washed the radiator several times, CAT washed and blew it out, still got hot. I finally got a 90degree fitting for the end of my pressure washer, dropped the fan and washed up thru the radiator. You would not have believed all the crap that came out. I questioned CAT several times about the fan not spooling up. Apparently on these it isn't so much variable speed as it is a two speed. They said the only time it will speed up is when it is doing a regen. Even when my hi temp warning light came on it did not spool up. But, like you said, unplug the solenoid it goes full speed. I did have mine calibrated, nothing changed.

    This is the picture I took after i finally got the 90 degree fitting and started washing. About two hours later it was much better.

    [​IMG]
     
  5. KSGENE

    KSGENE Member

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    Do you need the seal kit to check the valve? Didnt want to pull it off and look with out the seal kit if so.
     
  6. Vetech63

    Vetech63 Senior Member

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    Not to check it. Only replace the orings if flat or damaged.
     
  7. jrtraderny

    jrtraderny Well-Known Member

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    I have a new solenoid valve coming just in case , will check old one when it gets here. I ran it today with the solenoid unplugged and the temp stayed around 185 but once in awhile would bump up to 190 or so with the ambient temp around 75 degrees that still bothers me a little. Installed new thermostat last Sunday with no difference in temps . Temps verified with an infrared temp gun. Cat dealer tech line suggested water pump impeller
    may be eroded ??? I'm sure the radiator is clear I've had my diagnostic camera in there and can see right through .
    Thanks for the input !!
    jr
     
  8. Vetech63

    Vetech63 Senior Member

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    I wouldn’t worry about temps around 190, the engine temp will change just a bit depending on the load conditions. Your issue is the amount of air going through the radiator.
     
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  9. jrtraderny

    jrtraderny Well-Known Member

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    Interesting that you'd mention the digital tachometer , I had the radiator raised on my 226B3 today and saw the reflective tape on one of the fan blades. Might just get my tach out and see if it still works .
     
  10. jrtraderny

    jrtraderny Well-Known Member

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    That's what I'm afraid of , when I put my mower on when it's 95 degrees out and run it in High Flow . 90 minutes one way to my Cat dealer may have to make the trip.
     
  11. jrtraderny

    jrtraderny Well-Known Member

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    That's what I didn't understand if the solenoid valve actually varied the oil flow or just dumped oil to the return. I've had my camera up in there and can't see any debris in the cores.
     
  12. jrtraderny

    jrtraderny Well-Known Member

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    Is this solenoid valve just either open or closed ? Or does it actually vary the flow ?
     
  13. Nige

    Nige Senior Member

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    A Serial Number would help to get exact information. Electrical Schematics differ between various Serial Number prefixes.
    From what I can see the 396-4882 solenoid is referred to as the "fan demand". It is driven by a PWM driver from the machine ECM, therefore the most likely scenario is that it is completely variable between 0 and 100% and will depend on coolant temparature. Otherwise I don't see a reason for it to be driven by a PWM driver.
    Edit: I was right. Taken from the machine Service Manual -
    "Hydraulic Demand Fan Control
    The control system will monitor engine coolant temperature, hydraulic oil temperature, intake manifold temperature, and ambient temperature to control and limit the fan speed. The monitoring is done by proportionally modulating the hydraulic oil pressure to the hydraulic fan bypass valve. This feature is also known as the engine cooling fan. This system will also run at maximum speed during a Diesel Particulate filter (DPF) regeneration cycle. This system will limit minimum fan speed to 1200 RPM anytime the Air Conditioning switch is ON."



    To test the fan speed appears to require Cat ET and a phototach - see attached.
     

    Attached Files:

    Last edited: Jun 17, 2019 at 1:35 PM
  14. jrtraderny

    jrtraderny Well-Known Member

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    Serial# BL901413
     
  15. Nige

    Nige Senior Member

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    Thanks for the information. I can confirm that the info I posted above is correct for your machine, the fan speed control solenoid is variable type and driven by a PWM signal from the machine ECM.

    If you want a copy of the Electrical Schematic click on my username and start a Conversation. Send me your email address and you're welcome to it.