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Old 09-24-2020, 05:51 PM   #1
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1998 Dynasty air tanks and levelling

Junior member asking some basic stuff here and really appreciate advice.
We have a 4 point auto level system HWH. Once I found the unplugged power connector to the control pad all is working.
Paul Maddox was of great help sending me the manuals to study. He also said the levelling system gets its air from the primary tank?
So my questions are as follows
1. Is the primary tank also called the wet tank?
2. When my air gauges go to nothing in 24 hours of sitting how does this system still work and continue to self monitor every 30 minutes?
3. Does it have its own compressor or is there still air on the primary tank even though the gauges read zero ?
4. Last question is that I know I need to check both primary and secondary air tanks from time to time even though there is a dryer on the rig. Is it safe enough to crawl under the rig without blocking it to check the blow valve on the wet tank (at the rear of rig nearest to compressor) Good practice says I need to do this daily. I farmed long enough to understand good maintenance but a bit confused around the air suspension being part of the primary tank and concerned around the warnings of not messing with airbag levels without proper blocking.
5. If I have to block the rig where and how is the best way to do this?
My secondary tank has a cable pull installed so can check daily without crawling underneath.
Thanks in advance for any info as to how the air suspension works and if it has anything at all to do with the air brake tanks. ?
Apologies for the dumb questions I read the HWH Manual but still does not compute how it works.
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Old 09-24-2020, 06:03 PM   #2
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Your primary tank is your front dry tank. It may be a split tank, which means a single tank with a bulkhead separating it into wet tank, and primary dry tank.
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Old 09-24-2020, 06:50 PM   #3
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Hi JMCruiser; Glad to see you got power to the HWH panel. As 96 posted the front tank could be a split tank. My 2000 Windsor and my now 01 Windsor has just that, a split tank up front and a single tank in the rear. In the HWH Air Leveling Instructions, it should say that when you auto level, after the system has finished leveling the system goes into sleep mode and rechecks that the unit is level every 30 minutes. This is the way the HWH air leveling worked on my previous 2000 Windsor. Not sure on your year of Dynasty, but on my 2000 Windsor I had a Thompson air compressor located up front below the coach floor between the front wheels. Look behind the front wheels up at the coach floor and if it is there you will see a compressor with air lines and 12V power lines going to that compressor. If the compressor is operational it will come on and fill any air bags that have gone out of level. Any air bags that have lost some air will trigger the level in the control box to relevel the coach by turning on that Thompson air compressor.

I used to test my Thompson air compressor by turning the HWH panel on and depress the RAISE button. This turns on the leveling air compressor and when you are sitting in the drivers seat you can hear it run. Again, this is how things worked on my 2000 Windsor with the HWH Air Leveling System. I did have to replace that compressor as it was bad. Took me 2 years to discover this as I was self educated on the system and had an extended warranty to pay for that replacement. The compressors were not cheap at about a grand, $1,000.

I am under the coach at times and I always crack the drain valves on the air tanks to see if there is any moisture in the tanks. On both coaches I have never gotten anything out of the tanks so that tells me that the air dryer is doing it's job. I also have not blocked the frame as letting such a small amount out of air out of the tanks would not let the air out of the air suspension as there is a pressure protection valve that keeps the air in the air suspension. I think I got that right. If not others here will correct.

Hope this answers some of your questions and have a great evening! P.S. I miss the air leveling that I had on my 2000 Windsor. My 01 Windsor has hydraulic and I liked the air better. Just me!
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Old 09-24-2020, 08:48 PM   #4
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Got a question 8.3Oilbirner. I think I have what you had A split tank up front and one in the rear. I had a truck shop add in an airline for a hose. They said no need to have 2 valve cocks for the tank and used that port for the airline hose. If its a split tank do I not need to have two petcocks to drain the splits?
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Old 09-24-2020, 09:32 PM   #5
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Good evening JMCruiser; To my knowledge, yes. The 2 drains on the one tank are to drain moisture, water, from each tank section. If they installed an air line now in one of the drain ports and you want to keep that line I would just hook up an air nozzle to that line and periodically exhaust some air from that line. Should be the same as turning the petcock to drain water, moisture from the tank. This is just my opinion. Might want to see what others say, but don't know any reason why this procedure would not work!
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Old 09-25-2020, 04:23 AM   #6
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Tapping a line into a drain port of your primary air tank has some risks.

No good shop should do it.

A few things;

Water can collect in a low spot and freeze, possably causing the line to burst. Probably why they use fitting on the top and sides of the tank. Not the bottom.

The line can get damaged and you lose all of your air while driving. Its sticking down out of the tank !!
Losing all of your air causes the parking brake comes on, leaving you stuck on the road.
That's why all taps off the tanks, not used for brakes, have pressure protection valves. They shut off the flow at 70 PSI or so, leaving you some air in your tanks. You will at least have air for your brakes to get to a safe place or shop.

There is a lot of thought and design in air brake systems with safety in mind. Doesn't take much to mess it all up.
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Old 09-27-2020, 09:52 AM   #7
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Thanks for the advice twinboat. I have a ? If I ask the shop to put the pet cock drain back and take the hose off , where should that hose be connected to system so it provides air to a hose and do they need to put a pressure protection valve in at the same time ?
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Old 09-27-2020, 10:04 AM   #8
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Have them Tee into a line after a pressure protection valve, already installed.
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Old 09-27-2020, 10:14 AM   #9
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Good morning JMCruiser; I should have asked this question when you posted your question about the air line added to your front air tank. By any chance does your Dynasty already have an air line? Both Monaco Windsor's I have owned have an air chuck located in the area where the propane tank is mounted. It has a Yellow Cap or cover over it. This is where I have an air hose set up and I just remove the Yellow Cap and insert the fitting into the air coupler that is mounted on the sidewall of the propane compartment. Not sure what year and what models Monaco added this feature, but I have seen this line on a lot of Monaco coaches. This line is not to be confused with the air line that a tow truck would hook up to supply air to release the spring brake. That line is usually up front in the gen. compartment and some late model Monaco coaches have both air lines in the gen. compartment. Just asking!
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Old 09-27-2020, 10:26 AM   #10
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Morning 8.3oilbuner. Glad you asked that question. Yes there is an air hose hook already there and I did not see it. I asked the truck shop to put one in and they used the petcock drain to install They found the other one and did not call me , just installed the second one ? twinboat has me thinking I need to take this new hose off and put the drain cock back and use the air hose line that was already installed but I was to dumb to spot. You must think I am pretty green at all of this and you would be right. I do very much appreciate all the help this forum gives me. Over time I will learn more and more ...thats the part I am enjoying . Take care and stay well enjoying a great fall . cheers
John J
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Old 09-27-2020, 05:56 PM   #11
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Hi John; Well, I am sure a lot of us started out that way. It never hurts to keep on asking as that help sharpen our minds! I lurked here for quite a while until I figured that I had enough hard knocks under my belt to start contributing. I never stop learning. I don't think too many judge here so keep on asking. Even I do now and then and there are many here way ahead of me!

By the way, a 1998 40' Dynasty Duke was the first DP I drove. I was coming out of a truck & camper so 40' was way too large for us. Very nice coach. Even after all these years the Dynasty's are top notch in my book. I wanted something shorter so went with the Windsor. Almost the same except for some extra bells & whistles. Have a great evening!
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