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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Tikvah on May 05, 2013, 05:36:25 AM

Title: Air Problem - Video
Post by: Tikvah on May 05, 2013, 05:36:25 AM
I think my relief valve is blowing, but I don't know anything about this system

Dave

http://youtu.be/akZZ9YVRx5k (http://youtu.be/akZZ9YVRx5k)

In the video I said it shuts off at 95.  Obviously I miss-spoke... it shuts off near 110
Title: Re: Air Problem - Video
Post by: Van on May 05, 2013, 05:55:34 AM
Going through the same scenario with a C-3 at work. we'll start trouble shooting Mon, should be interesting to say the least. will let ya know what we find out.  ;)
Title: Re: Air Problem - Video
Post by: Jriddle on May 05, 2013, 07:17:52 AM
When your bus is running and you are building air the relief will go off and then the bus compressor will unload or stop building air.
Your shop compressor is set at a higher pressure than your bus relief is set and the sound you hear is your shop compressor continuing to try to build air. It has no way to unload or know that your bus system is full.  
I’m not sure what pressure your relief is set at but in video it looked low. Your system seems to be working fine. (For being connected to your shop compressor.)
John
Title: Re: Air Problem - Video
Post by: Scott & Heather on May 05, 2013, 08:45:10 AM
Does it do that when bus is airing up without shop compressor? Normal startup, air build and run? If so, could be your relief valve is dirty. Mine is filthy and really needs to be cleaned..so it releases and doesn't seal quickly and takes a minute to close back up...
Title: Re: Air Problem - Video
Post by: Scott & Heather on May 05, 2013, 08:47:41 AM
Does it do that when bus is airing up without shop compressor? Normal startup, air build and run? If so, could be your relief valve is dirty. Mine is filthy and really needs to be cleaned..so it releases and doesn't seal quickly and takes a minute to close back up...
Title: Re: Air Problem - Video
Post by: Ralph7 on May 05, 2013, 09:44:36 AM
     That is your air dryer and it sounds like that , LOOK at all the moisture comming out!!!!
     The dryer may need a change or the valve may be dirty.
     Mine unloads at 120.   
     When was the last time you drained the rear tank( tank near the differentinal)????
    Do you live in an area of high humidity?
     
Title: Re: Re: Air Problem - Video
Post by: Seangie on May 05, 2013, 04:33:07 PM
Dave,

I just had the same exact problem.  Mine was a bendix AD2 dryer with the safety release on the side.  The safety was rated for 150 and would pop at 95 or so and would not turn off.  Check it by getting under there and getting your hands on the safety release.  If there is air shooting out the safety release valve go get a new one for about 10$ and swap it out.

Here is a pic of mine (super easy to service on an eagle ;) )
(http://img.tapatalk.com/d/13/05/06/7u7apu4a.jpg)

-Sean

PS - Do like John said and double check that your shop compressor is not pushing more than 120 (or more than the dryer is set to cut out at)  if it is then John is correct in that the compressor is still pushing air.  Get your hands on it to figure out which valve the air is coming out of.


 www.herdofturtles.org  (http://www.herdofturtles.org)
1984 Eagle Model 10S
Title: Re: Air Problem - Video
Post by: Scott & Heather on May 05, 2013, 04:33:51 PM
Sorry, but I didn't see moisture coming out???? Looked at the video twice.


Sent from iPhone via Tapatalk
Title: Re: Air Problem - Video
Post by: Tikvah on May 06, 2013, 03:58:05 AM
Good information. 
I haven't started the bus yet this year, but I plan to start it this week and drive to Muskegon.  I'll let you know what it does when I start it.

I have a new tank behind the last bay.