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Topic: Re: HWH issues (2008) (Read 165 times) previous topic - next topic - Topic derived from HWH issues (1998)

Re: HWH issues (2008)

On my 2008 it appears that the pressure switch for the compressor maintains a set pressure mostly to be available for the slide bladders. When the system calls for air to inflate a bag for leveling the compressor runs even if the pressure switch is satisfied. I have had it in near excess slope conditions run the compressor trying to raise a corner and actually pop open the pressure relief valve. At some point excess slope or low battery will cause the auto level to give up.
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148

Re: Re: HWH issues (2008)

Reply #1 –
A couple of ways to test if the pump is functioning. One turn the key on for your slides. If the amber light stops flashing it's made the vacuum switch. The only way it can do that is for the pump to run. You can go outside while you're waiting and see if it's running. The other easy one is open the air drain for your slide seal tank and see if the pump runs.
2008 Nimbus 342
Build# 6464
ISM 500
Allison 4000 w/retarder
2021 Jeep Grand Cherokee

Re: Re: HWH issues (2008)

Reply #2 –
Quote from: Dennis H –
On my 2008 it appears that the pressure switch for the compressor maintains a set pressure mostly to be available for the slide bladders. When the system calls for air to inflate a bag for leveling the compressor runs even if the pressure switch is satisfied. I have had it in near excess slope conditions run the compressor trying to raise a corner and actually pop open the pressure relief valve. At some point excess slope or low battery will cause the auto level to give up.
Dennis,
Not to hijack the thread but I've seen the same issue. My question is. Why does the HWH system ask for air that it is not using. If the pump is supplying air to the airbags for leveling purposes. How would it hit the pressure relief valve without being level. It should show excess slope and shut down. I've had this intermittent issue and it's frustrating to troubleshoot.
2008 Nimbus 342
Build# 6464
ISM 500
Allison 4000 w/retarder
2021 Jeep Grand Cherokee

Re: Re: HWH issues (2008)

Reply #3 –
Quote from: Res777 –
Dennis,
Not to hijack the thread but I've seen the same issue. My question is. Why does the HWH system ask for air that it is not using. If the pump is supplying air to the airbags for leveling purposes. How would it hit the pressure relief valve without being level. It should show excess slope and shut down. I've had this intermittent issue and it's frustrating to troubleshoot.

In my case the coach was trying to lift the left front corner. Problem was that it was out of room for further suspension travel. The bag was being pressurized with all the compressor was allowed with the relief popping. I was parked on soft, wet ground and I think that after it leveled, (barely) the left front sank and then the system tried to adjust. The coach was twisted enough that some of the bay doors were mis-aligned. I won't try that much adjustment again.
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148

Re: Re: HWH issues (2008)

Reply #4 –
Quote from: Chuck & Jeannie –
Have to be aware that, in this thread, we have participants with coaches made a decade apart.  The OP has a 1998 U320.  We have members Dennis and Res777, both trying to help, but they both own 2008 Nimbus models.  I suspect (but don't know for a fact) that there may be differences in the way the aux air compressor functions, and the way the air tanks and air lines are connected/routed, in those different model year coaches.

I'm thinking it might be helpful in these "air system" discussions if members would mention what leveling system they have as a preface to their comments.  That way we will know if we are talking about similar systems, or totally different systems.  Might help all of us learn more about how the different HWH leveling systems operate.

As for me, my comments are based solely on my experience with the HWH 600 Series leveling system in a 1993 U280.  TIFWIW

See the link below for a quick overview of the different HWH leveling systems and how to identify:

https://hwhcorp.com/ml17785_01_nom_pr_lesy.pdf


Absolutely. Why I often mention my coach model and year. Also, my coach is a 4 slide, with only 2 key switch stations. Each station has a rocker switch to select driver or passenger side. My system needs to confirm level before a slide can be opened, and al the slides have to in before the trans will go in gear or the parking brake gets released.
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148