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Old 05-04-2014, 09:23 PM   #1
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Air tanks

Just wondering about dumping the air tanks. How often? etc. I live and travel mostly in the Pacific North West, if that makes a difference? My mechanic slide under my rv and pulled on the chords hanging down and dumped all the air out, but I don't want to crawl under my rv every time they need to be dumped.

Any input or information out there for me?

Thanks,

Park Ranger
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Old 05-04-2014, 09:30 PM   #2
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Put longer cords on them so you can reach them from outside but make sure they don't drag or dangle to low. I purg mine before and after a trip.
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Old 05-04-2014, 09:37 PM   #3
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most RVs the cords are installed in the frame where you can pull from the gen bay standing out side

if yours is not setup this way i am sure you can edit it to do this as i had to do the same thing

not sure on the time line alot well say on every long trip
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Old 05-05-2014, 07:26 AM   #4
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Air tanks

Thanks for the response. Looks a tough to get to and how to get out to wear they can be reached? Guess I will have an RV guy look at it.
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Old 05-05-2014, 08:15 AM   #5
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Freightliner says to drain the tanks for 15 seconds every 6 months.
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Old 05-05-2014, 08:40 AM   #6
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Hi Park Ranger,
Consider dumping the air once a year. The air should be dumped completely. Any water in the tanks will drain out only after the PSI is down to 0. If you get any water after the first year, consider dumping the air in six months. Find a schedule that suits where you live and how the coach is used. The objective is to remove water from the tanks. My coach spends the winters in south Florida and the summers in eastern Tennessee and traveling the USA. In 9 years, I have never seen any water come out of the tanks. I dump the air once a year when the annual maintenance is done.
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Old 05-05-2014, 10:19 AM   #7
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How Often to Purge Air Tanks

My owners manual says to purge the tanks daily when in active use.

They made it simple with a toggle switch on the side dash to execute. No lanyards to pull.
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Old 05-06-2014, 08:49 AM   #8
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Thumbs up Air tanks

Wow that's a relief to know that I don't have to dump them that often.

Thanks for the feedback!
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Old 05-10-2014, 12:13 PM   #9
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How often does the Commercial trucker dump his air....Daily. Why......water build up in air tanks will cause rust. Of course we must deal with weather, temp, humidity, use to determine how often to dump air in a MH. I leave my air taps open when parked to let the moisture and oil blow by to drain.
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Old 05-10-2014, 02:01 PM   #10
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Air tanks

on my HWH automatic levelling control panel there is a button "Air Dump". Is that what we're talking about? i don't believe I have any lanyards to dump the air, at least I've never seen them.
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Old 05-10-2014, 02:19 PM   #11
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Quote:
Originally Posted by alpha99 View Post
on my HWH automatic levelling control panel there is a button "Air Dump". Is that what we're talking about? i don't believe I have any lanyards to dump the air, at least I've never seen them.
The air tanks are isolated from the air suspension by a pressure valve that will shut down air to the suspension at 65 psi or so ; this is to save air for brake operation in the event of a air spring ( bag ) blow out. So the air dump button will not purge the tanks.
My lanyards were coiled up on top of the tanks, not run out by Newmar or either of the POs, I ran them to a spot where I could reach them with the awning pull down rod.
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Old 05-10-2014, 08:22 PM   #12
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In the course I took to get my air endorsement on my driver's license it was stated the tanks had to be drained daily.
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Old 05-10-2014, 09:41 PM   #13
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With daily use, air tanks should be drained daily, especially in cold weather. That said, if you are getting water out of your secondary storage tanks, the desiccant air filter should be replaced ASAP. HDT repair shops have told me that if you allow moisture/water to get into your air brake system get out your wallet or CC, it is an expensive repair. Replacing the desiccant air filter every 2 years is much cheaper and easier. Remember hearing your air system "pop" when the compressor reaches cutout pressure? That "pop" is the air system backwashing the desiccant filter with filtered air, it blows captured moisture back out of the filter with air from your storage tanks.
Since about the 1990's, air systems usually have automatic drains as well as cable-pulls to manually drain them.
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Old 05-11-2014, 12:58 AM   #14
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Some great free downloads from Freightliner. Too big to post here but if your interested.
Freightliner Custom Chassis

Click " See RV Chassis "
Then " Owner Information "
Download the pdf. files " Motor home Maintenance tips"
and " Knowing your RV chassis "
Some of the info is of course Freightliner only, but some info on the systems is generic.
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