Need some expert air bag leveling advice

[Scott & Heather]

Dave5c, what are you driving again? MCI?


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[Scott & Heather]

gg04, I don't have the front manual set yet so I have no idea


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[sledhead]

no problems in over 10 years . before I removed my org. valves I measured the height at the 1st bumper strip and to get the coach at the same level this is the air pressure I need when driving
but as luvrbus would say jello bags due bounce  ( and now he has some on his coach )

dave

[Dave5Cs]

Scott laughing at your question what do I drive. Yes MCI MC 5C Saudi coach.
We also have only had to use our riser block a few times. If you measure the distance of travel from full down to full up on a standard coach it is almost 4 inches at the axles. But if you consider the overhanges front to back which is another 6 to 8 feet depending on your coach and you drop the tail or rear axle bags as low as they will go mine almost puts the bottom of the bumper on the ground and the front bags all the way up 4 inches at the front axle plus the overhangs. You measure it from the ground will be between 7 to 12 inches. So that is quite a bit of adjustment and side to side is enough to level it out.
Dave5Cs

[brmax]

hmm, low riding

[RichardEntrekin]

Scott,

Did you ever figure out why the drastic difference in side to side air bag pressure required to level your coach?

[Jim Eh.]

Scott, have you ever checked the ride height with all the bags deflated? That would be my starting point.

If I remember correctly the whole reason for the tag axle was for stability reasons. If you increase the air pressure on the tag axle it transfers MORE weight onto the steer axle (drive axle acts like a fulcrum). On my coach there is a traction switch that decreases the tag axle air pressure (by about 30% if memory serves me correctly) for times that you are stuck. It in effect transfers more weight onto the drive axle for increased traction. Regardless of the tag axle air pressure there is no effect on side to side balance.

It may be a little bit of work but if you have easy access to your pressure gauges try swapping them side to side and see if you pressures read differently.

There are only two things that make the vehicle lean - pneumatic difference or mechanical difference (incorrectly matched bags, suspension mounting point differences, grossly overloaded to one side, twist in the body , etc.)

[Lin]

I won't be able to hold my hand steady enough.

[Scott & Heather]

I have not yet sorted this out. With all bags deflated completely the coach sits level if on a level surface. To keep the coach level during driving, this is what I have to have the settings at:

Drivers bags: 75psi
Curbside bags: 70psi
Tag bags: 58 psi

If I drop the tag bags to 40psi, the curbside drops out of level. It's weird. I am loaded heavy on that side with washer, dryer, kitchen cabinets, 40 gallon water heater, and 150 gallon fresh tank.

Other side has full tile shower with mortar shower pan, stove, both bathrooms, black tank, and that's about it. So the only thing I can think of is that I'm heavy curbside. I need to scale just that side of the coach to confirm this.


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[daddysgirl]

This might be irrelevant, but is it possible (in addition to being heavy on one side) that the 8" roof raise and tire size could contribute to this problem?
Just a thought.

[gg04]

You will not have control until you can control the front bags. Your fighting the factory controls, you adjust they resist.  rdw

[Scott & Heather]

Roof raise won't cause it to lean. Tire size is the same all around and it did this when I had 22.5's on the coach before I switched over to 24.5's. I raised the roof 9" on my MCI 9 bus and never had this issue. I really think I'm over weight on that side


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[Dave5Cs]

Scott which oil do you use?!...
Dave

[Oonrahnjay]

Scott which oil do you use?!...
Dave 

     Yeah, 15W-40 will make it lean like that.

[eagle19952]

     Yeah, 15W-40 will make it lean like that.

as will Delvac