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Old 10-21-2014, 06:13 PM   #15
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I do have air leveling, but this air release is coming from the bottom of the dryer. 1st time I heard it, I was putting fresh oil in. Standing right there, I could put my hand under the dryer and feel it.
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Old 10-21-2014, 06:26 PM   #16
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Originally Posted by 96 Wideglide View Post
I do have air leveling, but this air release is coming from the bottom of the dryer. 1st time I heard it, I was putting fresh oil in. Standing right there, I could put my hand under the dryer and feel it.

Certainly not normal. The purge signal comes from the air governor and occurs when the pressure in the system hits the air governor cut off pressure. Obviously this can only happen when the engine is running. If the valve is purging at random then something is going on with the purge valve on the dryer.


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Old 10-21-2014, 07:50 PM   #17
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Yeah, thats what I thought !
Asked Meritor, and they say,' that can happen'. If it does'nt completely drain your tanks overnite, should'nt be a problem !!
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Old 10-22-2014, 08:43 AM   #18
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Yeah, thats what I thought !
Asked Meritor, and they say,' that can happen'. If it does'nt completely drain your tanks overnite, should'nt be a problem !!

Never heard of this or suspected it could happen. There is a check valve at the input to the wet tank which is first in line from the dryer. If it is functional then this shouldn't be possible. Maybe if the check valve is leaking pressure back toward the dryer, it causes the purge valve to cycle. They also call the purge valve the "unloader" valve so after it fires there should not be any pressure in the system behind the air tanks until the air governor turns on the compressor.

Next time you have service you might consider using a big truck shop & let them look at the air system. If you find out anything be sure to post.

I'm flummoxed and curious.

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