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Old 11-21-2015, 10:27 PM   #1
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Question in draining air tanks

In reading the owners manual on our 2006 HR Navigator, it states that the air tanks should be drained once a month. But it does not say anything about refilling them at this point in the instructions. In a totally different section it does talk about "external charging" of the air system. I'm assuming from what I read that air should be reintroduced into the tanks through the air dryer and not externally due to moisture. Can anyone shed any light on this? Only owned this coach a couple of months.
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Old 11-21-2015, 11:03 PM   #2
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I could be wrong on your setup, but the draining of the tanks they are probably referring to is the manual purging of water condensation. There should be a purging lanyard for each tank, probably inside the front wheel well if it's a Freightliner chassis. You don't have to drain the tanks of all air, just open the purging valve long enough to blow out any collected water. The air tanks will automatically reinflate when you start the engine.
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Old 11-21-2015, 11:24 PM   #3
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Quote:
Originally Posted by Lt Dan View Post
I could be wrong on your setup, but the draining of the tanks they are probably referring to is the manual purging of water condensation. There should be a purging lanyard for each tank, probably inside the front wheel well if it's a Freightliner chassis. You don't have to drain the tanks of all air, just open the purging valve long enough to blow out any collected water. The air tanks will automatically reinflate when you start the engine.
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Old 11-21-2015, 11:24 PM   #4
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[QUOTE=Lt Dan;2834451]I could be wrong on your setup, but the draining of the tanks they are probably referring to is the manual purging of water condensation. There should be a purging lanyard for each tank, probably inside the front wheel well if it's a Freightliner chassis. You don't have to drain the tanks of all air, just open the purging valve long enough to blow out any collected water. The air tanks will automatically reinflate when you start the engine.[/QUOTE


That makes sense. It's a Roadmaster but I bet that's what manual is referring to. Will take a look tomorrow.
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Old 11-21-2015, 11:29 PM   #5
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Quote:
Originally Posted by sunset4k View Post
In reading the owners manual on our 2006 HR Navigator, it states that the air tanks should be drained once a month. But it does not say anything about refilling them at this point in the instructions. In a totally different section it does talk about "external charging" of the air system. I'm assuming from what I read that air should be reintroduced into the tanks through the air dryer and not externally due to moisture. Can anyone shed any light on this? Only owned this coach a couple of months.
Not going to hurt anything leaving the tanks empty. I would'nt run the engine just to fill the air tanks.
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Old 11-22-2015, 05:29 PM   #6
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There is no need to "drain" the tanks unless you are planning to work on the air systems to repair the air bags, air dryer or brakes. Purging moister was already discussed by OP. The air compressor on the engine continously refill the system. when system is full you hear air self purging. " CSSISSHHHH" I would not leave the tanks set empty of pressure because it may take a while to refill to be able to release the park brake to move the MH. The refill by "external charge" is if you lost your air do to a brake in the lines or some other catastrophic event and needed to fill the air to release the park brake. this is done with road service or at a shop in the event the motor won't start.
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