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Topic: Hwh (Read 886 times) previous topic - next topic

Hwh

Ok here we go, Hwh goes into travel mode just fine. Parked on a level concrete pad, attempting to raise the coach to install safety stands right side comes up as it should, left Side lacks about a inch of coming up high enough to put y th he stands in. No combination of control pad buttons will make it happen raise front, raise rear, raise left. Ideas? Keep in mind it will come partially up.

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Reply #1 –
There was a thread on this subject not too long ago. I wish I remembered the answer.  I bet Michelle when she sees this she will find it.

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Reply #2 –
Just a guess, left front raise solenoid o-ring leaking with higher pressure.  LR trying to do all the work for that side.

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Reply #4 –
Engine running when trying to raise?
What is system air pressure at max (right after dryer purges)?

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Reply #5 –
Yeah I've had that issue for a while. Usually it's the driver side then I rebuilt the six pack and it was better but I still have some leaks and different places so that is my assessment. In the past I've had to wrap a rope around the stand and while holding the raise button pull the rope to get the stand out. But first you have to get the stand in don't you?

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Reply #7 –
Turbojack, I did find that post. Thanks

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Reply #8 –
It's a puzzle...
With air system at 130, both "weak" corners (LF and LR) are seeing the same supply pressure as the "strong" side (RF and RR).
If it was a "leak" in a raise solenoid causing the problem, it would have to be an identical leak in both front and rear HWH manifolds.
If it was a "leak" somewhere else, it would have to be a hose (or other component) that is common to both LF and LR corners.
If it was a mechanical problem, like binding suspension linkage, it would (once again) have to be present at both ends of coach.
If there was NO problem last time you tried to insert your stands, but there IS a problem now, something had to change.  What?
It's a puzzle.

 :help:

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Reply #9 –
Chuck, it has always in the last few years been harder to get the left side all the way up. Although I haven't had any issues while we have been out all summer. I going to break out the books and start checking to see if there is anything common to both front and rear.

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Reply #10 –
If you get the coach up as much as you can and shut it down does one corner leak down ahead of the other corners?

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Reply #11 –
John, no it doesn't takes days for it to leak down.

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Reply #12 –
I had trouble getting the left front up high enough to get the block in and the last few times its
been the right front.

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Reply #13 –
I will be watching this thread as I have the same problem but its the right front in my case.

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Reply #14 –
Bruce you say you're parked on a level pad but in my experience even a slight amount of slope side to side can significantly affect how high up that side will get on the suspension.  Assuming that every air bag is seeing the same pressure, they all have an equal load capacity and therefore the only thing that could affect the height would be the load that any individual bag (or side) was seeing.  The other thing I've figured out is that the air pressure regulator under the front end is there specifically to keep the front end from lifting too high.  I've seen others comment that it's there to prevent the front end from lifting too quickly but I dismiss that because it wouldn't matter how fast it raises.  What does matter is that the only thing limiting how high the front end raises is the length of the shocks.  I've proved this because my shock mounts were bent from overextension of the suspension.  The way to control that is by limiting the air pressure to the front six pack (to around 60psi).  The back doesn't matter as much because the rear end is much heavier and usually if you use the HWH control to raise the suspension (mine latches in) you leave it in raise mode until the safety stands fit under the rear suspension.  Of course if the front regulator is set too high (or malfunctioning) the front end is trying to stretch the shocks while you wait for the rear to come up high enough to get the safety stands in.  Don't underestimate the power of these air bags at 120+ psi.  Back to your problem, you could try to swap your coach around in the same spot so the right and left sides are reversed and see if the problem swaps sides or not.  Just a thought.

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Reply #15 –
I had this problem when I first got my got my u320. Once I fixed the major air leaks it went away.

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Reply #16 –
The concrete pad is dead level

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Reply #17 –
weight distribution in the coach?  Maybe one side loaded heavier?

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Reply #18 –
Would it matter if a leveling valve was not in the same position as the rest

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Reply #19 –
By "leveling valve" I assume that you mean "ride height valve"?  It shouldn't matter because he's trying to raise the coach to install the safety stands.  He either has a latching "raise" button on the HWH panel or if its a momentary switch, he has to hold the raise button until the coach is high enough (different models of HWH control panel work differently).  In that case the system is simply supplying full air pressure to the six pack which distributes it to the air bags.  The ride height valve is completely bypassed in this case.