Mack air compressor not kicking back in till 60 psi

Discussion in 'Mack Forum' started by EarlBob, Aug 8, 2021.

  1. EarlBob

    EarlBob Bobtail Member

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    Aug 8, 2021
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    On the air system, builds up till air dryer blowers off then not building again till pressure drops to 60 psi then builds again till blow off and repeats process, has new compressor, governor, and dryer
     
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  3. King Michael

    King Michael Light Load Member

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    Nov 20, 2018
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    Adjust the governor on air compressor.
    If not serviceable, replace it.
    If internal governor, replace air compressor.
    Skill level... medium
    Time to try fix... 15 minutes
    Time to replace... 1 hour
    Patience level... Low
     
  4. EarlBob

    EarlBob Bobtail Member

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    Aug 8, 2021
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    I've been fighting this thing for a week now, new compressor, and air dryer 3rd governor on it now. Adjusted governor to 120 psi blow off but still compressor doesn't kick in till pressure is at 60 psi
     
  5. King Michael

    King Michael Light Load Member

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    Nov 20, 2018
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    Sorry to say, your gonna hafta bite the bullet and take in to a shop.
    Sorry I couldn't help more.
     
  6. Chrisjohn97

    Chrisjohn97 Bobtail Member

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    Aug 12, 2021
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    Do you have an air fan clutch? Is the fan clutch leaking air by any chance? My thought is that maybe it’s leaking more air than the compressor can make. And once it gets to 60lbs the fan clutch can’t get air again until the air is built back up again? Kinda a long shot but I’ve seen something similar on a western star.
     
  7. EarlBob

    EarlBob Bobtail Member

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    Aug 8, 2021
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    I appreciate the replies but it turned out I got 3 bad governors from the parts store. Went to a different store got a different brand of governor. Must have been a bad batch of them.
     
  8. Chrisjohn97

    Chrisjohn97 Bobtail Member

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    Aug 12, 2021
    0
    Ahhhhh, that does happen with mass manufactured parts, glad to hear you figured it out
     
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