Clunking noise

Discussion in 'Mack Forum' started by 1717rsc, Aug 8, 2021.

  1. 1717rsc

    1717rsc Bobtail Member

    Jun 10, 2021
    I have a 2014 cxu613 mack . When taking off from stop I hear a clunking noise coming from my driver side steer usually does it at take off and when I’m coming to a stop and just coasting I hear it at low speeds like 5mph . Also just usually does it loaded and probably Mid day to end of day I guess by mid day it’s probably hot enough . I did stop when loaded at a truck stop and had a guy try to see we’re it was coming from and he said he couldn’t hear it but I could feel it then he put his hand on tire and felt it jump he said it was my bearings . Well left dropped of load 1 hr later I stop and feel that hub and it’s hotter then the other one so I guess it is my bearing . Any suggestions any other test I can do to verify it is bearing. Also come to find out this is a unitized hub . Mack only sells the whole hub $800 bucks . Has anybody changed one of these also I did find the bearing online for like 200 has anybody changed just the bearing o this unitized hubs .
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  3. King Michael

    King Michael Light Load Member

    Nov 20, 2018
    I suggest you take it to a mechanic that specializes in front ends.
    Hub rarely goes bad. Bearings are replaceable. If hub does seemed damaged slightly, Emory cloth will clean it up. (Emory cloth is a special type of sand paper)
    Caution... Emory cloth is extremely abrasive on metal(though it doesn't seem so by touch)
    Go to a trusted mechanic, again better if he deals with front ends, stay away from dealer if possible.

    Lastly, before throwing parts at it, check springs, shackles, shackle pins, and king pins.
    King pin can only be checked when tire is off the ground
  4. Chrisjohn97

    Chrisjohn97 Bobtail Member

    Aug 12, 2021
    Did u have lug nuts come loose recently on that hub? Or take a lug nut off and check if the hole for the stud in the rim is slotted. If it is then your lug nuts are either loose or they were loose on the last truck that rim was on. Then check the landings on the hub where the inside hole on the rim sits on the hub. You’re checking to make sure the landing is the same height it’s whole length. If there’s a groove in it you have or had loose lug nuts at one point or another. If neither of those options show a problem, check springs and shackles and everything king Michael said
    baha Thanks this.
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