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Grinding noise

Discussion in 'Questions From New Drivers' started by Jcleve, Jul 18, 2019.

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  1. Jul 18, 2019 #1
    Jcleve

    Jcleve Bobtail Member

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    I've been driving for less than a year. Recently my 2016 Mack pinnacle day cab I started having a grinding noise from the gearbox. This happens in the upper gears 8th 9th and 10th mainly. It happens when I'm trying to accelerate in any one of those gears when I press the throttle go be a loud grinding noise and a spike in RPMs and no increase in power. On the plus side there's no loss of power. Any ideas would be greatly appreciated
     
    Jcleve, Jul 18, 2019
    Jcleve, Jul 18, 2019
    #1
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  3. Jul 18, 2019 #2
    COBB2070

    COBB2070 Medium Load Member

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    Get the gear box oil changed. Probably going find a good bit of metal in there.
     
    COBB2070, Jul 18, 2019
    COBB2070, Jul 18, 2019
    #2
    okiedokie and Lepton1 Thank this.
  4. Jul 18, 2019 #3
    starmac

    starmac Road Train Member

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    A spike in rpms??
     
    starmac, Jul 18, 2019
    starmac, Jul 18, 2019
    #3
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  5. Jul 18, 2019 #4
    Jcleve

    Jcleve Bobtail Member

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    When I'm driving an eighth, 9th or tenth and I press the throttle the grinding noise begins in the RPMs will jump 2 to 300. I assume that's because I'm applying throttle obviously but the power is not providing torque. That's just my guess.
     
    Jcleve, Jul 18, 2019
    Jcleve, Jul 18, 2019
    #4
  7. Jul 18, 2019 #5
    Jcleve

    Jcleve Bobtail Member

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    I'll recommend that to the mechanic when I bring it in. It's a company truck I just don't want to be on the side of the road
     
    Jcleve, Jul 18, 2019
    Jcleve, Jul 18, 2019
    #5
    COBB2070 Thanks this.
  8. Jul 18, 2019 #6
    Intothesunset

    Intothesunset Road Train Member

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    Bad clutch , bad gears.
     
    Intothesunset, Jul 18, 2019
    Intothesunset, Jul 18, 2019
    #6
    magoo68, FlaSwampRat and Jcleve Thank this.
  9. Jul 18, 2019 #7
    Brandt

    Brandt Road Train Member

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    RPM spike would be the clutch slipping. Maybe clutch is making noise. I never had one make noise but when they wear out they slip
     
    Brandt, Jul 18, 2019
    Brandt, Jul 18, 2019
    #7
    MartinFromBC, okiedokie, Lepton1 and 1 other person Thank this.
  10. Jul 18, 2019 #8
    starmac

    starmac Road Train Member

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    If the rpms are truly rising, without the truck speeding up, it will be something to do with the clutch. I can't explain the grinding noise, but if it is gaers and it slips, you would be dead in the water.
     
    starmac, Jul 18, 2019
    starmac, Jul 18, 2019
    #8
    MartinFromBC, Intothesunset and Jcleve Thank this.
  11. Jul 18, 2019 #9
    Jcleve

    Jcleve Bobtail Member

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    Putting it into the shop tomorrow. I just wanted an idea how to explain it to the breakdown Department. Thanks for all the advice. I had a feeling was along those lines but I wasn't certain
     
    Jcleve, Jul 18, 2019
    Jcleve, Jul 18, 2019
    #9
    MartinFromBC, COBB2070 and Intothesunset Thank this.
  12. Jul 18, 2019 #10
    FoolsErrand

    FoolsErrand Road Train Member

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    May just need the clutch rod adjusted. Does the clutchbrake work?
     
    FoolsErrand, Jul 18, 2019
    FoolsErrand, Jul 18, 2019
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    MartinFromBC Thanks this.
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