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Volvo 780 Drive axle PSI for max legal weight?

Discussion in 'Questions From New Drivers' started by Midnightrider909, Mar 3, 2021.

  1. Mar 3, 2021 #1
    Midnightrider909

    Midnightrider909 Road Train Member

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    I just picked up a load that has 40,500 pounds in it and there’s nowhere to get scaled and it looks like most of the weight s toward the front and in the middle so I’m not too worried about the trailer tandem axle weights and I’ve got 53 psi reading on the drive axle airbags. Am I legal to run this load?
     
    Midnightrider909, Mar 3, 2021
    Midnightrider909, Mar 3, 2021
    #1
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  3. Mar 3, 2021 #2
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Probably. Any truck I ever drove had to be somewhere around 60 psi, give or take a couple pounds.You need to start writing down what your airbag pressure is at various weights. When you find out the pressure when you are at max weights on the tractor, it will make things a lot easier on you.
     
    kemosabi49, Mar 3, 2021
    kemosabi49, Mar 3, 2021
    #2
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  4. Mar 3, 2021 #3
    Snailexpress

    Snailexpress Road Train Member

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    My rear 34000 with pressure around 56psi. Empty 15 psi
     
    Snailexpress, Mar 3, 2021
    Snailexpress, Mar 3, 2021
    #3
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  5. Mar 4, 2021 #4
    Midnightrider909

    Midnightrider909 Road Train Member

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    Thanks! It looks like anything over 56psi is the danger zone.
     
    Midnightrider909, Mar 4, 2021
    Midnightrider909, Mar 4, 2021
    #4
  7. Mar 4, 2021 #5
    Snailexpress

    Snailexpress Road Train Member

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    Yes it is.
     
    Snailexpress, Mar 4, 2021
    Snailexpress, Mar 4, 2021
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  8. Mar 4, 2021 #6
    Allinone777

    Allinone777 Bobtail Member

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    On a Volvo 56-58 psi. And it's very depend on how it's loaded 56psi is a safe number
     
    Allinone777, Mar 4, 2021
    Allinone777, Mar 4, 2021
    #6
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  9. Oct 25, 2022 #7
    Stringb8n

    Stringb8n Road Train Member

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    I've got a 780 volvo, and empty with a flat trailer my air suspension has 12psi. I imagine that means my ride height might be out of adjustment? Truck rides rough as hell, feels jumpy and bouncy a lot.
     
    Stringb8n, Oct 25, 2022
    Stringb8n, Oct 25, 2022
    #7
  10. Oct 25, 2022 #8
    Snailexpress

    Snailexpress Road Train Member

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    I have reefer trailer what is heavier on the front.
     
    Snailexpress, Oct 25, 2022
    Snailexpress, Oct 25, 2022
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  11. Oct 25, 2022 #9
    abyliks

    abyliks Road Train Member

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    Scale empty, weight / psi = xx pounds per psi

    72 truck 84 trailer is 34/34, 154 psi total with the light weight suspension under my reefer, 85/80 = 165 on my dump puts me at 99k

    don’t know why in this day and age with everything being on air these are not standard on all equipment
     
    abyliks, Oct 25, 2022
    abyliks, Oct 25, 2022
    #9
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