Ringing sound?!?

Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by Hodginshauling, Jul 2, 2019.

  1. Hodginshauling

    Hodginshauling Bobtail Member

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    Hey everyone,
    Hoping to get some insight on a ringing sound my 1994 Ford L9000 8.3 Cummins Quad dump truck is making. We try to do what we can mechanic wise ourselves on the weekend so we don’t have any downtime on the truck.

    It is very high pitch and only occurs when the truck is moving. Doesn’t matter if loaded or not anytime the truck is moving it makes this noise and doesn’t if it’s sitting idle. Ive included a video of the sound.



    Any ideas?

    Thanks in advance.
     
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  3. drivingmissdaisy

    drivingmissdaisy Medium Load Member

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    Wheel bearings? I'd say thats bearings somewhere. Since it's not when its sitting I'd say drivetrain bearings somewhere. Maybe even the driveshaft, transmission, something going wonky there.

    It also apparently has a dog caught up somewhere in the drivetrain.
     
    Last edited: Jul 2, 2019
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  4. Blu_Ogre

    Blu_Ogre Road Train Member

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    Could something be dragging? Like a hung tire chain?
     
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  5. Espressolane

    Espressolane Road Train Member

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    Check the carrier bearing.
     
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  6. vikingswen

    vikingswen Road Train Member

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    Bicyclist stuck under neath ringing his bell?
     
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  7. Buck_webb

    Buck_webb Bobtail Member

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    Wheel bearings would be my guess
     
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  8. Hodginshauling

    Hodginshauling Bobtail Member

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    Jul 2, 2019
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    Thanks for the feedback. The high pitch whistle hurts my dogs ears, sorry for the barking in the video. My husband said it is in the engine or in that area. He did say he will check the carrier bearing. Thanks again! Will post if we figure it out.
     
  9. RustyBolt

    RustyBolt Road Train Member

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    If its coming from the engine bay, does it change with the RPMs? If so, could be a pully bearing. AC, alternator, belt tensioners, etc.
     
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  10. ErieMcDreary

    ErieMcDreary Medium Load Member

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    Take the belts off and start it up.
    DON'T ALLOW IT TO RUN LONG ENOUGH TO OVERHEAT!!!!!
    That will help locate the issue.
    If the noise is gone, you know it is from something that the belts turn. Alternator, water pump, one of the tensioners, etc.
     
    speedyk Thanks this.
  11. skellr

    skellr Road Train Member

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    How fast are you traveling in that video?
     
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