Suspension lean solved...what I learned

[Gregory OConnor]

Scott, maybe it was the distorted bag. weak tires fill taller with
the same air pressure

Greg
pt40 Romoland California

.a > Scott Forman wrote:
>
> >Thought I would share my findings with the group regarding the
> >leaning air suspension I have talked about here lately.
> >
> >I got the coach back yesterday after having a rough-looking airbag
> >replaced on the left front (for review-the front axle was listing
to
> >the left while the rear was properly level). The old bag that was
> >replaced appeared to still be holding air (no audible leaking
noise
> >and no bubbling when soaped), but did have a large tear in the
outer
> >bladder that had exposed the inner bladder to the environment.
> >Holding air or not, I figured its days were numbered, so I opted
to
> >replace.
> >
> >The suspension now operates correctly. Since the only thing that
has
> >changed is the replaced bag, I have developed a theory on what was
> >causing my lean:
> >
> >I suspect that the torn bag was seeping air even though I could
find
> >no evidence of it. As a result of this, I believe that when the
> >suspension was airing up from a dump position and the front
leveling
> >valve was calling for air to lift the front axle, air would fill
the
> >right side bags faster than the left side, casuing the lean. The
> >front leveling valve only knows up and down, not side to side, so
it
> >just keeps pumping until a height is reached. If it lifts
unevenly,
> >it doesn't care, it just wants to reach a height. So the right
side
> >was getting over-inflated before the left could catch up.
> >
> >Meanwhile, on the rear axle, the rear valves that control side-to-
> >side were oblivious to what was happening. The lean was
pronounced
> >in the front, but 30 feet back at the rear axle, the lean was much
> >less dramatic, so the rear valves, though functioning correctly,
> >weren't adjusting enough to correct it.
> >
> >So that's my theory based on what I have learned. My escapades
> >chasing gremlins in the air suspension have given me a lot of
respect
> >for the complexity and engineering that went into the system.
It's a
> >living thing...it breathes, it consumes, and when you can't find
the
> >problem, it seems like it hates. Many different things that all
have
> >to work together or the whole thing fritzes out.
> >
> >Scott Forman
> >'Tiger Pride'
> >82 FC35RB
> >Memphis
> >
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> >
> >Yahoo! Groups Links
> >
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