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2009 Cascadia with Detroit Series 60 14L, air compressor won't build more than 40 psi

Discussion in 'Freightliner Forum' started by whskypete, Jul 16, 2014.

  1. Jul 16, 2014 #1
    whskypete

    whskypete Bobtail Member

    28
    1
    Sep 17, 2013
    0
    I have a Freightliner Cascadia with a Detroit Series 60 14L with about 750K miles, air compressor was replaced about 2 years ago and the air dryer done about 4 months ago. Air compressor will not build above 35-40 psi. I have replaced the air gov and by passed the air dryer and still not successful. I want to be sure the air compressor is the problem before I replace it. Any ideas would be greatly appreciated.
    Thank you
     
    whskypete, Jul 16, 2014
    whskypete, Jul 16, 2014
    #1
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  3. Jul 16, 2014 #2
    baha

    baha Road Train Member

    4,137
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    Jul 25, 2013
    ga
    0
    CK. the air line out of comp. leadihg to 1st air tank, then small air line leadihg to tank out of side of gov. they will only leak with comp. trying to build air,
     
    baha, Jul 16, 2014
    baha, Jul 16, 2014
    #2
  4. Jul 17, 2014 #3
    whskypete

    whskypete Bobtail Member

    28
    1
    Sep 17, 2013
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    The primary discharge line is fairly new (about 4-6 months) but I will check it anyway. I will also look at the small line from the tank to the side of the gov. thank you
     
    whskypete, Jul 17, 2014
    whskypete, Jul 17, 2014
    #3
  5. Jul 17, 2014 #4
    wore out

    wore out Numbered Classic

    14,330
    173,843
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    Just a ol dumb country boy way but if you pull line off compressor and can hold your thumb over it while its pumping then its the compressor. If not then as stated you have governor issues of some kind
     
    wore out, Jul 17, 2014
    wore out, Jul 17, 2014
    #4
  7. Jul 18, 2014 #5
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,779
    1,725
    Jun 14, 2009
    romulus,mi
    0
    it is usually the secondary discharge line.the primary is made from a braided,high temperature teflon line.the secondary is your standard,non braided type.problem is that it is joined behind engine and above transmission.you can't hear it leaking with engine idiling,let alone when you are rev'ing it up.good luck.
     
    QUALITYTRUCK, Jul 18, 2014
    QUALITYTRUCK, Jul 18, 2014
    #5
  8. Jul 18, 2014 #6
    whskypete

    whskypete Bobtail Member

    28
    1
    Sep 17, 2013
    0
    Found the problem, it was the compressor. Installed the Detroit Diesel air compressor, fired up the engine and psi was able to build right away.
    Thanks for the ideas.
     
    whskypete, Jul 18, 2014
    whskypete, Jul 18, 2014
    #6
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