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Blue Nile trucker

Air not building

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Hello everyone 

  I’ve got 2007 Mack chn613 that’s been really good to me for the past few years but now it just stoped building air at all I’ve checked the air governor looks fine asking anyone that can tell me what the problem might be and how to fix it? THANKS! 

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Yup, when I had my original 673 pump rebuilt they told me that was included.

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So, removing the governor line from the compressor does not make it build air?

Has the coupler broken and the pump not turning?


Remove the intake line, spin motor with starter and see if you feel any suction.  

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1 hour ago, Freightrain said:

So, removing the governor line from the compressor does not make it build air?

Has the coupler broken and the pump not turning?


Remove the intake line, spin motor with starter and see if you feel any suction.  

I just checked and there is no suction at all so I think I might have bad air compressor here thanks

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2 hours ago, Blue Nile trucker said:

I just checked and there is no suction at all so I think I might have bad air compressor here thanks

Or the coupling has sheared it's drive teeth. They are phonelic composition and if not renewed with the compressor change, are highly suspect.

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