2006 387 c-15 air compressor continues to purge air!!!

Discussion in 'Peterbilt Forum' started by bstromback2002, Jan 17, 2014.

  1. bstromback2002

    bstromback2002 Light Load Member

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    May 12, 2012
    wi
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    After the compressor is done building pressure and it purges the air dryer it continues to pump air out the purge on the air dryer. Sometimes just for a minute sometimes till the next pressure building cycle starts. Any ideas??? Someone told me maybe the unloader valve on the top of the compressor head.
     
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  3. jameslawton

    jameslawton Light Load Member

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    May 1, 2013
    Tulsa OK
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    check the air line from gov to air dryer if it leaks it will cycle also might be time to replace cartridge and purge valve on dryer
     
  4. Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    Wyoming
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    When's the last time you changed the cartridge (air dryer filter)?
     
  5. bstromback2002

    bstromback2002 Light Load Member

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    I changed the cartridge early summer late spring.
     
  6. Cat sdp

    Cat sdp . .

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    Orion's Belt
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    I see your location is listed as WI..... Could freezing be the problem ?
     
  7. bstromback2002

    bstromback2002 Light Load Member

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    No it does it even when I'm in Florida.
     
    Cat sdp Thanks this.
  8. pop's

    pop's Light Load Member

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    Feb 3, 2013
    Yulee FL.
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    Change the purge valve.
     
  9. Cat sdp

    Cat sdp . .

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    Orion's Belt
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    If your always losing air out of the purge valve of air dryer the problem is in the dryer. I've never had any luck paying someone else to rebuild a dryer. Your better of just going with a new one .



    New cartridge , purge valve and heat element all at once.....
     
  10. bstromback2002

    bstromback2002 Light Load Member

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    May 12, 2012
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    I talked with someone at the dealership and he suggested the unloader valve since the purge valve is supposed to be open when the compressor is not suppose to be building pressure. The kit is only $88 so I'm going to give that a try. And a new dryer cartridge.
     
  11. KC Guardrail

    KC Guardrail Light Load Member

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    Dec 7, 2013
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    Nice. Come here for advice, then go against the advice and do what the parts jockey suggests. Please let us know how it turns out.
     
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