Air pressure not building up

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by BlackKw900, Feb 28, 2021.

  1. BlackKw900

    BlackKw900 Bobtail Member

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    Feb 12, 2021
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    Good morning guys
    I’m in need of help I have a w900 that it’s not building air pressure, I just replace the air compressor and governor and give it a go and still not building air, so next took air dryer apart to clean it up and still not the same, I have check for air leaks and couldn’t find any.
    Thanks for help
     
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  3. xsetra

    xsetra Road Train Member

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    What motor?
    Did you remove the outlet from compressor or inlet hose to air dryer and check for air pressure?
     
  4. baha

    baha Road Train Member

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    If you can't hear air leaking from any place, pull line off back of air comp. and ck for air coming out of it, if nothing replace gov. with new not rebuilt one?
     
  5. Deere hunter

    Deere hunter Road Train Member

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    Check and see if you have a one-way valve stuck they do that from time to time.
     
  6. BlackKw900

    BlackKw900 Bobtail Member

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    Feb 12, 2021
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    Detroit 60 series, yes air is coming out of compressor
     
  7. BlackKw900

    BlackKw900 Bobtail Member

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    Feb 12, 2021
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    Check for air leaks and couldn’t find any, already replace compressor and brand new gov
     
  8. BlackKw900

    BlackKw900 Bobtail Member

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    Feb 12, 2021
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    Hey Deere hunter, how do I do that and where can I find it?
    Thanks
     
  9. Deere hunter

    Deere hunter Road Train Member

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    You’ll have a one-way valve into your primary tank that way the air goes into the tank but won’t come back out after you shut the truck off. they stick some are down by the tank some ate right at the compressor.
     
  10. Deere hunter

    Deere hunter Road Train Member

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    Lots of times you can free them up with WD-40 but it’s probably better just to replace it if that’s your problem
     
  11. Deere hunter

    Deere hunter Road Train Member

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    On my Peterbilt they are on the tanks right underneath the doors. I don’t know what you have
     
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