Jacks Must Be Used To Air Up Coach

[GaryKD]

This just started, right out of the blue sky. When the coach has been parked (air dumped) for more than a day, the coach will not air up. The dash gages show normal driving pressure but there is no air in the bags. I lower the jacks and lift the coach a few inches. The bags then fill with air. I have been under the coach and followed the lines. I see no problems with the line routing or any place a line could be crimped. I am only able to get under the coach when it is aired up.

Any ideas will be appreciated.
thanks,

[GaryKD]

This just started, right out of the blue sky. When the coach has been parked (air dumped) for more than a day, the coach will not air up. The dash gages show normal driving pressure but there is no air in the bags. I lower the jacks and lift the coach a few inches. The bags then fill with air. I have been under the coach and followed the lines. I see no problems with the line routing or any place a line could be crimped. I am only able to get under the coach when it is aired up.

Any ideas will be appreciated.
thanks,

[racer0624]

Gary,

If you have an HWH system I may have an answer for you as I had the same problem. Also sometimes the coach would air up but the jacks stayed down. Nappanee found that the ground connection(s) for the HWH system were all "cruddy" looking. They cleaned those connections and I've had no more trouble.

I don't know where Wellington is but when we're not on the road our coach is 2 blocks of the Gulf. Could-it-be???

John, 2005 4502 EXDP

[Brigadoon]

I've discovered that after dumping but not putting the jacks down, that I have to hit the store button and let the system do it's thing before the bags will air up. Perhaps yours is the same.

[GaryKD]

John & Terry, I'll try both of your suggestions. It might take some time to get an answer back to you, to make matters worse, this is an intermitent problem. thanks

[racer0624]

My problems were intermitent too Gary. In fact when I tried to demo the problem for Newmar techs. the system worked flawlessly. Repeated cycles over several days could not make the system malfunction. My Onan power slide compartment, also part of the HWH system would occasionally not work. A suggestion by HWH led to Newmar techs. locating the poor grounds.

John, 2005 4502 EXDP

[Pusherman]

Gary,

I have the HWH system on a Freightliner chassis. There is a signal to the system to air the bags when you release your park brake.

Try it. I had a problem with my '00 Journey, and I would release the park brake, reset it, and the coach would air up.

[JerryKelly]

I experience the same problem when I just dump the air. To air up, I would have to release and reset the park brake. I don't dump the air anymore, unless I have to. This problem does not occur when I use the automatic leveling program.

[GaryKD]

Don & Jerry,
I tried the parking brake suggestion with no change in the symptom.

I do have an additional clue. I need to raise only the front of the coach (with the jacks) for the coach to start to air up. If I raise just the rear, there is no change in the symptom. I tried determining where the HWH ground wire(s) might be, but I could not make heads or tails of all the wires. I will try again later.

[Brigadoon]

Gary,
Speaking of clues, one thing that I did not mention in my post might be the same for you. The only time this situation occurs for me is when I dump but do not put the jacks down. I then have to hit the store button to let the system "store" the jacks. Now for my clue, when I do that I sometimes hear the jacks clunk into the stored position. This leads me to believe that the jacks have dropped slightly down out of the stored position and need to be snugged back up into the stored position before the system will air up the bags.

By the way, I only hear the front jacks clunking into position.

That's my guess as to what's going on with my system.

[PairoDocs]

Our DSDP spent some time at the Cummins Onan Spartan repair facility due to the same problem. I would dump the air to make getting up the steps easier and the air bags would not refill even though the gages indicated they were doing so...the coach would not come up. We would lower the jacks and store them, thinking we were triggering the air bags to fill. This seemed to do the trick, so I took it in for service. After 3.5 hours of time at the service center (for which I was charged $393.00) the answer came forth. It required the local guys talking to Newmar and Spartin. Please pass this on...
The air bags will not refill unless the "store" button is pushed due to the presence of some type of relay. Spartan was unaware of the need to sequence the store button, and I guess Newmar filled them in. (By the way Newmar covered the $393.00 even though I was out of the warranty period.)

Speaking of "air bags"
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>ranch just outside Roswell, New Mexico.
>
>This is a well-known incident that many say has long been covered up by the
>U.S. Air Force and the federal government.
>
>However, you may NOT know that in the month of March 1948, exactly nine
>months after that historic day, Albert Arnold Gore Jr., Hillary Rodham,
>John
>F. Kerry, William Jefferson Clinton, Howard Dean, Nancy Pelosi, Dianne
>Feinstein, Charles E. Schumer, and Barbara Boxer were born.
>
>See what happens when aliens breed with sheep? This piece of information
>may clear up a lot of things.

[GaryKD]

Thanks to all who are responding with a HWH connection to air bags filling. My coach does not work this way. Since taking delivery, there has never been any connection between the HWH and air leveling systems. The process of:
1. Retracting the jacks (wait for the jacks to auto turn off).
2. Start the engine.
3. Waiting for the coach to air up (as the final walk around is done)
no longer works.

I must now:
1. Start the engine.
2. Raise the front jacks to a higher position than is required for the coach to be level.
3. Wait for the coach to air up.
4. Store all jacks (with the store button).
5. The HWH system will automatically turn off.

There is also no connection between the parking brake and the air system.

[OpaRon]

Doesn't the audible warning signal drive you crazy when you raise the jacks and the engine running? It would drive me to another coach! (Or at least to the factory.) OpaRon

[GaryKD]

OpaRon,
You are correct! . The warning beep does drive me crazy . This is why I am desperate to get the fix so I can go back to the original process. Store the jacks first, then start the engine.