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Air system problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by labratrans, Jan 20, 2011.

Page 1 of 3
  1. Jan 20, 2011 #1
    labratrans

    labratrans Bobtail Member

    24
    2
    Sep 9, 2010
    Toronto, ON
    0
    Hey guys,

    Got a problem with air loss / build up. When using the air system heavily, e.g. when backing up in a tight spot heavy, using the brakes a lot etc. the pressure goes down quite quickly to below 90 and then takes a long time to build up to normal even if RPMs raised to 1400.
    No air leaks when the engine is off.
    Dryer cartridge replaced ~ 3 months ago

    Any ideas where to look ?
     
    labratrans, Jan 20, 2011
    labratrans, Jan 20, 2011
    #1
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  3. Jan 20, 2011 #2
    Flying Finn

    Flying Finn Heavy Load Member

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    Jun 22, 2010
    Ontario, Canada
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    Your compressor or governor would be a good spot to start.

    Define "long time", is it over the 1 minute build up time at idle from 90 to 135?
     
    Flying Finn, Jan 20, 2011
    Flying Finn, Jan 20, 2011
    #2
  4. Jan 20, 2011 #3
    labratrans

    labratrans Bobtail Member

    24
    2
    Sep 9, 2010
    Toronto, ON
    0
    Governor is brand new too.
    Takes about 3-4 minutes
     
    labratrans, Jan 20, 2011
    labratrans, Jan 20, 2011
    #3
  5. Jan 20, 2011 #4
    Flying Finn

    Flying Finn Heavy Load Member

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    Jun 22, 2010
    Ontario, Canada
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    This truck should be at a mechanics and OOS by our regs. Probably your compressor is shot, or there is a restriction in the wet system somewhere.

    Put it in a shop before someone gets killed.
     
    Flying Finn, Jan 20, 2011
    Flying Finn, Jan 20, 2011
    #4
  7. Jan 20, 2011 #5
    labratrans

    labratrans Bobtail Member

    24
    2
    Sep 9, 2010
    Toronto, ON
    0
    Been to 2 shops, they can't figure it out
     
    labratrans, Jan 20, 2011
    labratrans, Jan 20, 2011
    #5
  8. Jan 20, 2011 #6
    canuck in da truck

    canuck in da truck Road Train Member

    4,352
    2,601
    Aug 6, 2010
    western pa
    0
    air system is not very complex---i would suggest taking it to reputable shop not joes taco stand &truck repair
    it sounds like either the compressor isnt putting out enough --or possibely a blockage in the system
    as the compressor ages it will pass oil--and when the oil cools it hardens --kinda like charcoal --its possible that coould be the probelm
     
    canuck in da truck, Jan 20, 2011
    canuck in da truck, Jan 20, 2011
    #6
  9. Jan 20, 2011 #7
    labratrans

    labratrans Bobtail Member

    24
    2
    Sep 9, 2010
    Toronto, ON
    0
    Yes, that's exactly the problem.

    When a Volvo dealer tells me they can't fix it because they can't recreate it in the shop i feel like driving this truck through their showroom...

    It does not happen all the time. When I'm on the highway it does not do that. I can see the pressure in the primary go down to 100 psi and then back to cutoff pressure, so that's normal I think.
    It does it when I do a lot of back and forth, e.g. when backing up in the Bronx someplace
     
    labratrans, Jan 20, 2011
    labratrans, Jan 20, 2011
    #7
  10. Jan 20, 2011 #8
    Flying Finn

    Flying Finn Heavy Load Member

    972
    558
    Jun 22, 2010
    Ontario, Canada
    0
    Have you done the air build up test? to see if it is in spec?
     
    Flying Finn, Jan 20, 2011
    Flying Finn, Jan 20, 2011
    #8
  11. Jan 20, 2011 #9
    canuck in da truck

    canuck in da truck Road Train Member

    4,352
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    Aug 6, 2010
    western pa
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    hmmm ok--you would think volvo techs should be expirienced enough to figure it out
     
    canuck in da truck, Jan 20, 2011
    canuck in da truck, Jan 20, 2011
    #9
  12. Jan 20, 2011 #10
    The Admiral

    The Admiral Heavy Load Member

    894
    561
    Jul 18, 2010
    Akron,Ohio
    0
    Maybe a bad pancake (brake chamber diaphram) Pull your hand valve down and walk around the trailer,listen for air leak.
     
    The Admiral, Jan 20, 2011
    The Admiral, Jan 20, 2011
    #10
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