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  1. #1
    RC poster
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    Jul 2016
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    Exclamation traxxas x maxx weird sound

    Hello all.

    I have bought an x maxx for my kid and while I'm testing it I hear a weird sound from the motor at low speed.
    this sound only comes when it starts to move but then it doesn't make that sound.
    here is the video.
    https://youtu.be/CE1XEWYgoUQ

    is this sound Normal?

    thank you for your advice /help

  2. #2
    RC Champion traxxasfan21's Avatar
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    That sound is not normal. I would check the drivetrain for any binding because that could cause the motor to make that sound trying to overcome the resistance.
    Too much power is just enough

  3. #3
    RC Champion soundmaster's Avatar
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    nope not normal

  4. #4
    RC Qualifier
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    May 2016
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    Wonder if the motor bearings went out on the motor. Sounds like my vxl motor when its bearings crapped the bed.
    V1 BL5/2028, V2 max6/5882, Erevo, Summit, Rustler.

  5. #5
    RC Champion jeteffect's Avatar
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    Quote Originally Posted by saary View Post
    Hello all.

    I have bought an x maxx for my kid and while I'm testing it I hear a weird sound from the motor at low speed.
    this sound only comes when it starts to move but then it doesn't make that sound.
    here is the video.
    https://youtu.be/CE1XEWYgoUQ

    is this sound Normal?

    thank you for your advice /help
    Not normal. Sounds like drivetrain. It is easy to take gear cover off to see both spur and pinion.

    Gears not meshed? Is motor solid - bolts tight - does the motor mote side to side, back forth at all?

    With the cover off its easy to see while driving slow to observe. Let us know what you see.

    Also, screw on the pinion may need to be tighted.

    Hope these tips help.

  6. #6
    RC Champion rizz0d's Avatar
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    I'd say that's normal. Sounds like you are giving it just the tiniest amount of throttle. If i give mine like 2% throttle from a stop, it makes that noise until the motor finds it's timing. This is a sensorless brushless system, ESC has no clue where the rotor is so it just fires blindly until it gets going. Does it do this if you accelerate with like 40% throttle from a stop?
    rizzodtheRCvlogger - www.youtube.com/user/rizz0d

  7. #7
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    Jul 2016
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    I have opened the cover and I think everything looks for me Normal. I will be attaching videos for you guy for further advice. I think I was too soft on the throttle like what rizz0d said only at 2% to 5% of the throttle when this sound comes.
    https://youtu.be/S73VGe1kjKQ
    https://youtu.be/n67DqaZpz0s
    https://youtu.be/lqBIPpO-0uo

    No it doesn't

    Quote Originally Posted by rizz0d View Post
    I'd say that's normal. Sounds like you are giving it just the tiniest amount of throttle. If i give mine like 2% throttle from a stop, it makes that noise until the motor finds it's timing. This is a sensorless brushless system, ESC has no clue where the rotor is so it just fires blindly until it gets going. Does it do this if you accelerate with like 40% throttle from a stop?
    no it doesn't
    Last edited by Double G; 07-07-2016 at 06:37 PM. Reason: merge, clutter reduction

  8. #8
    RC Champion rizz0d's Avatar
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    just don't take off that slow and you'll be good.
    rizzodtheRCvlogger - www.youtube.com/user/rizz0d

  9. #9
    RC Competitor
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    Mine does same sound with 2% throttle but give it 20% and more it sounds normal, in my opinion seems fine

    Sent from my 0PJA10 using Tapatalk

  10. #10
    RC Champion Redsawacs's Avatar
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    Make sure you have the new updated firmware on the ESC.

    That noise is called "cogging" and it is typical on brushless sensorless motors. It is not good for the ESC to experience extended cogging - if you continue to make it do that when not moving, you're going to damage the ESC.
    "RED"

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