How to do a tug test in an automatic allison transmission.

Discussion in 'Trucking Schools and CDL Training Forum' started by TruckerHart, Nov 3, 2021.

  1. TruckerHart

    TruckerHart Bobtail Member

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    I have an automatic truck with an allison transmission that automatically selects neutral when the parking brake is engaged. How do I perform a tug test with this transmission? It will not select a gear when parking brake is applied
     
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  3. ZVar

    ZVar Road Train Member

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    Why are you setting the tractor parking brake to do a tug test? All that tells you the tractor brakes are holding and nothing else.
    To tug test, you hook up, look to make sure the jaws are engaged, then pull forward to test if the jaws are fully closed and locked.
     
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  4. TruckerHart

    TruckerHart Bobtail Member

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    Thanks for responding, the tug test would be performed on both the trailer brakes and truck parking brake to test each individually.
     
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  5. TruckerHart

    TruckerHart Bobtail Member

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    From what I understand they are testing me not the truck but the brake test seems like it has these several distinct parts.
     
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  6. truckdriver31

    truckdriver31 Road Train Member

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  7. truckdriver31

    truckdriver31 Road Train Member

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    its okay. im here if you need me
     
  8. Malt Ball Cult

    Malt Ball Cult Light Load Member

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    Tug test is to test that the 5th wheel is properly engaged and locked, and has absolutely nothing to do with checking tractor parking brakes.

    Wow.
     
  9. TruckerHart

    TruckerHart Bobtail Member

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    Okay. I hope so. All the videos I watch say otherwise. Doubt it will be an issue. I’m going to take my test at 8:15 we’ll see
     
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  10. Malt Ball Cult

    Malt Ball Cult Light Load Member

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    Well you just go right ahead and tell experienced drivers the job. Good on you.
     
  11. TruckerHart

    TruckerHart Bobtail Member

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    I didn’t. I was asking. Thanks
     
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