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christoph 03-30-2010 09:56 AM

Coil springs w/air bellows
We have a 94 Itasca. It seems a little mushy in the front when turning sharp and quick stops. I noticed the air bellows in the coil springs and they have the tire style needle valves. What is a good
pressure setting for these?

whem2fish 03-30-2010 10:41 AM

dont know your rig but my front end weighs 5300 lbs i run 60 psi
is it a p-30 or p-32 il check back

christoph 03-30-2010 10:45 AM

p-30 or p-32 what is that? tire rating?

whem2fish 03-30-2010 10:50 AM

is it a ford or chevy

christoph 03-30-2010 11:05 AM

Chevy w/454 auto xmission

whem2fish 03-30-2010 11:14 AM

what i thought 50-60 psi im at work give me about i hr ill give you a helpful link p-30,p-37,p-37 refers to the chassie

christoph 03-30-2010 11:20 AM

gvwr 11,800 gawr front 4,300 lbs rear 7,500 lbs. can't find any chassi info
other than vin#.

Clay L 03-30-2010 11:25 AM

I had a 96 motor home on a 95 P30 chassis. The vehicle owners manual described how to set the pressure in the airbags.

The owner’s manual gives the following ranges:

4,300 LB front suspensions = 10 psi to 50 psi
5,000 LB front suspensions = 40 psi to 50 psi
5,300 LB front suspensions = 50 psi to 80 psi
5,500 LB front suspensions = 60 psi to 100 psi

For the proper adjustment it says to inflate the air bags to the maximum pressure for your vehicle, load the motor home, park on a level surface and then reduce the air pressure as needed to level the motor home but don’t reduce it below the minimum.

I have seen other schemes for adjusting the pressure per ride quality, but the 1995 Chevrolet Forward Control Chassis owner’s manual said to do it as shown above.

I don't know if it's accurate or not but other posts have said the pressure in the bags affects the alignment and you should have it checked when you get the pressure set. The manual did not mention that however.

whem2fish 03-30-2010 11:30 AM

yours is very close to mine i dont know how to make a link for you to click on here is every thing you need to know about you chassis
a break down from vin your air pressure, how to check ride hight
when i bought my rv front were blown i instaled new ones what a difference then i added rear ones
ill check back dave

whem2fish 03-30-2010 11:32 AM

my link didnt work where letters are missing this should read p-chassis-allighnmentprocess.pdf
sorry dave

christoph 03-30-2010 11:56 AM

Thanks for the timely info. Its been a great help!

whem2fish 03-30-2010 12:34 PM

dont know how to fix my link i do all my repairs myself that site explains a lot on the gm chassis if you ever have questions ask this is the best site with lots of helpful people

christoph 03-30-2010 01:11 PM

Thanks again.


tedlou 03-31-2010 07:23 AM

I have a 1990 Mallard with a Chevy P30, 454 V8 with an auto. I too had a mushy feeling in the front when going around a corner. It felt like I was being pushed off the road when passed by a big rig at highway speeds. It looked like it was sagging in the front on a level lot. I thought about replacing the bags and springs but decided to replace just the springs with heavy duty springs and I trashed the air bags. Now my RV sets level, the ride is great and it corners very well. The big rigs don't push me around any more either. I personally would recommend replacing your springs and ditching the bags.

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