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Dump truck PTO stops raising box when my foot is on the brake

Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by Dera209, Jul 22, 2022.

  1. Jul 22, 2022 #1
    Dera209

    Dera209 Bobtail Member

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    Mar 25, 2021
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    Hi would anyone know why the PTO would stop raising the box when foot is on the brake . It works fine with the parking brake applied.
     
    Dera209, Jul 22, 2022
    Dera209, Jul 22, 2022
    #1
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  3. Jul 22, 2022 #2
    abyliks

    abyliks Road Train Member

    4,027
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    May 2, 2010
    ludlow MA
    0
    What year truck and what kind of pto? Either spool valve is sticking or it’s got some kind of nanny system in it to stop it if it’s not stopped
     
    abyliks, Jul 22, 2022
    abyliks, Jul 22, 2022
    #2
    Dera209 Thanks this.
  4. Jul 22, 2022 #3
    Dera209

    Dera209 Bobtail Member

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    Mar 25, 2021
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    Thank you for responding I will definitely check what you mentioned. Its a 2020 peterbilt 567 super tag dump truck. Not sure about the kind of pto but it came equipped from the factory. It has eaton automatic transmission. I bought the truck used with 170k miles .
     
    Dera209, Jul 22, 2022
    Dera209, Jul 22, 2022
    #3
  5. Jul 22, 2022 #4
    abyliks

    abyliks Road Train Member

    4,027
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    May 2, 2010
    ludlow MA
    0
    If it’s factory and an automatic I’m going to say it has some kind of nanny system on it to prevent it from dumping without the brakes on
     
    abyliks, Jul 22, 2022
    abyliks, Jul 22, 2022
    #4
    wis bang Thanks this.
  7. Jul 25, 2022 #5
    Todd727

    Todd727 Medium Load Member

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    Jun 7, 2021
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    Something seems off. I don't see how you could do asphalt without being able to feather the brake and spreading gravel would be a PITA with an auto that you couldn't feather the brake.
     
    Todd727, Jul 25, 2022
    Todd727, Jul 25, 2022
    #5
    Dera209 Thanks this.
  8. Jul 25, 2022 #6
    Dera209

    Dera209 Bobtail Member

    41
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    Mar 25, 2021
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    Hahaha you already know the struggle man but I'm making it work. My mechanic said there could be a setting on the engine which prevents it from working with the brake. For that I would have to find someone with a computer to connect and see if thats the case.
     
    Dera209, Jul 25, 2022
    Dera209, Jul 25, 2022
    #6
  9. Aug 9, 2022 #8
    GenesisTransport

    GenesisTransport Bobtail Member

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    Mar 30, 2020
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    Hit the throttle while holding the brake
     
    GenesisTransport, Aug 9, 2022
    GenesisTransport, Aug 9, 2022
    #8
    Dera209 Thanks this.
  10. Aug 9, 2022 #8
    GenesisTransport

    GenesisTransport Bobtail Member

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    Mar 30, 2020
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    You have to throttle up to use the pto with your foot on the brake.I’ve got a 2020 Pete 567 with auto trans and do asphalt and all types of work with it. Your truck should be in neutral, it won’t work in a drive gear
     
    GenesisTransport, Aug 9, 2022
    GenesisTransport, Aug 9, 2022
    #8
    Dera209 Thanks this.
  11. Jun 21, 2025 #9
    emptrans0823

    emptrans0823 Bobtail Member

    1
    0
    Jun 21, 2025
    0
    Hello im having the same issue. I know throttling works but is there a way to bypass the nanny system? Thank you
     
    emptrans0823, Jun 21, 2025
    emptrans0823, Jun 21, 2025
    #9
  12. Jun 21, 2025 #10
    Dera209

    Dera209 Bobtail Member

    41
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    Mar 25, 2021
    0
    I've learned to live with it.
    But it is posible you're gonna have to change parameters on the ECM.
     
    Dera209, Jun 21, 2025
    Dera209, Jun 21, 2025
    #10
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