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Air building too slow, purge valve question

Discussion in 'Freightliner Forum' started by MercerDriver, Nov 12, 2014.

  1. Nov 12, 2014 #1
    MercerDriver

    MercerDriver Light Load Member

    69
    7
    Sep 3, 2010
    Atlanta, GA
    0
    Long story, short.

    Had the truck parked for about 10 weeks.

    Started it up, air building a lot slower than it used to.
    Also, all of a sudden, at 130 psi, the purge valve kocks in and stays open till gauges show approximately 110 psi. Then the cycle repeats.

    What is causing the purge valve to stay open and dump air out ???

    Detroit 60, 12.7. Governer mounted on air dryer unit.
     
    MercerDriver, Nov 12, 2014
    MercerDriver, Nov 12, 2014
    #1
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  3. Nov 12, 2014 #2
    skateboardman

    skateboardman Road Train Member

    6,232
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    Jan 14, 2012
    flatbed heaven
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    when purge valves and stays open have ya tapped on it to get it to close. sounds a malfunctioning purge valve, it can possibly replaced separately without the entire dryer being replaced. does it have a cartridge filter, if so that baby needs to be replaced on a regular basis
     
    skateboardman, Nov 12, 2014
    skateboardman, Nov 12, 2014
    #2
  4. Nov 12, 2014 #3
    062

    062 Road Train Member

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    What make of dryer?
     
    062, Nov 12, 2014
    062, Nov 12, 2014
    #3
  5. Nov 13, 2014 #4
    MercerDriver

    MercerDriver Light Load Member

    69
    7
    Sep 3, 2010
    Atlanta, GA
    0

    It's a Bendix with the cartridge on top and governer that bolts right to it.
     
    MercerDriver, Nov 13, 2014
    MercerDriver, Nov 13, 2014
    #4
  7. Nov 13, 2014 #5
    062

    062 Road Train Member

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    Oct 20, 2013
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    Probably purge valve,I have a wabco that was doing the same thing. But mine was caused by road debris,hit a piece of metal dinged purge valve,cracked regen housing. If it's constantly cycling you can stop at hardware store and get some pipe fittings to bypass it until you can fix it
     
    062, Nov 13, 2014
    062, Nov 13, 2014
    #5
  8. Nov 20, 2014 #6
    bravoo67

    bravoo67 Light Load Member

    252
    34
    Mar 15, 2012
    Brooklyn NY
    0
    Did you fix it ?

    Have exactly the same problem but on Volvo with Bendix AD-9 air dryer..

    it purges at 125 psi , purge valve slowly leaking to 120 psi ( can see it on gauges ) and cycles again :(


    Do you know what could it be ?

    Thank you!
     
    bravoo67, Nov 20, 2014
    bravoo67, Nov 20, 2014
    #6
  9. Jan 13, 2015 #7
    dustinbrock

    dustinbrock Road Train Member

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    Apr 19, 2012
    saskatoon,sk
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    Are you guys in cold climates? I had the same happen to me with same dryer. Took of the big line off the compressor and put some ethynol in there and whammy! Purges like a somabich.
     
    dustinbrock, Jan 13, 2015
    dustinbrock, Jan 13, 2015
    #7
  10. Jan 13, 2015 #8
    dustinbrock

    dustinbrock Road Train Member

    1,306
    900
    Apr 19, 2012
    saskatoon,sk
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    Sorry. Methynol not ethynol
     
    dustinbrock, Jan 13, 2015
    dustinbrock, Jan 13, 2015
    #8
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