FYI on bearing temps.

Discussion in 'Tires / Brakes / Bearings / Axles' started by mstriker, Aug 23, 2007.

  1. mstriker

    mstriker New Member

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    May 22, 2007
    I just recieved this answer back from Dexter about how hot is to hot:

    Thank you for visiting the Dexter Axle website and sending us your question.
    Heat needs to be isolated to determine if it is concentrated at the hub
    which would indicate a possible bearing problem, or if it is hottest at the
    drum which might indicate a brake issue.

    Normal operating bearing temperatures 140 to 175 degrees F.

    Normal operating brake temperatures can easily reach 150 to 400 degrees F,
    even up to 600 degrees F in heavy use situations.

    Humans typically find 150 degrees F too hot to touch and this would be
    normal temperature for both systems.

    CAUTION: Using your hand to test component temperatures may cause serious
    burns. There are devices on the market that are very inexpensive $20 that
    you safely point at an object to measure it's temperature.

    Excessive bearing temperature would possibly be caused by lack of
    lubrication, failure of lubricant, or improper bearing adjustment.

    Excessive brake temperatures may be an indication of a brake dragging or not
    releasing when braking is done. Check that the magnet lever arm is well
    lubricated and free to return when released.

    A cold brake may also need to be investigated as it may indicate that it is
    not functioning at all. Heat is a normal by-product of the braking process
    and if there is no heat there may be no braking going on

    Mike & Sandy
    `98 Coleman SeaPine
    `04 Suzuki XL-7
  2. Blkymom

    Blkymom New Member

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    Jan 15, 2006
    Alberta, Canada
    Good information, thank you!

    Tammy, Clint & Boys
    '77 BA1200
    '93 Jeep Grand Cherokee *new TV*
  3. achurch2k

    achurch2k New Member

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    Feb 21, 2006
    Glendale, Arizona
    Yes, it is great information. My bearings never seem to get above luke warm temperature, so if I touched a hot bearing hub I might have freaked out. Does anyone have bearings that run hot?


    1996 Coleman Cheyenne
    1999 VW Eurovan
  4. Fly

    Fly New Member

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    Jan 14, 2007
    At rest areas and when taking on fuel I always try to do the "walk around" check and very carefully touch the hubs (as well as the tire tread). Of course, during the hot summer months on a long trek, always a little warmer than on other cooler times of the year. One time, after having driven through a crash scene where there were still framents of glass and car parts, we continued on but had this "feeling" that I had better pull in somewhere and give things a check over. And good thing I did! Had a slow leak in one of the PU tires from a piece of glass and when I touched that tire it was hotter than Hades! Had maybe lost half it's air pressure, but was to take the tire to my tire guru who did an inside patch and the tire was then offically moved to spare tire duty.


    '99 Starcraft 1706
    '02 GMC Sierra

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