Air Dryer Purging Problems

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Trucker0101, Jun 16, 2019.

  1. Trucker0101

    Trucker0101 Bobtail Member

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    Jun 16, 2019
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    Air dryer was leaking air out of the bottom port after air reached cut out pressure and it purged normally. Changed air dryer thinking the purge valve was the problem (cost the same as the valve alone). Didn't work, same leak after new dryer. I then discovered built up pressure in the small purge line coming from the governor (this is where the leaking air in the dryer was coming from). Took the governor off and found someone put a plug in between the air compressor and the purge port on the governor (where the gasket between governor and compressor is). I removed the plug and installed the governor correctly. But now the system does not purge at all! Pressure rises normally and seems to cut out at 125-130 psi but no purging. Could it be the unloader valve in compressor? What do you guys think?

    Detroit 60 engine
     
  2. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    If you get the rattle snake sound from the purge valve after cutout, this air is usually coming from the compressor itself as the unloaders are not working and the compressor continues to pump air which is now just dumping out the open purge valve.
     
    Trucker0101 Thanks this.
  3. Trucker0101

    Trucker0101 Bobtail Member

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    Jun 16, 2019
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    Okay thanks, guess ill try an unloader kit next and see if that works
     
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