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Over time the soil spring will loose efficiency.  This will cause the front end to “float” while driving down the road.   This article outlines replacement of the front coil springs and airbags on the P30 Motorhome Chassis

 Precautions:

Ensure the rig is parked level or near level, rear wheels chocked.

Ensure you have adequately rated jack stands, minimum of three.

Upon removal of the lower ball joint, the lower control arm must be braced to prevent the installed spring from “launching”.

“Snug Tight” is to tighten with reasonable force with the correct size wrench.

 It is recommended to have a “floor” jack and hydraulic jack.

 Instructions:

 Jack up and support one side of the rig.

Remove the tire, store fasteners back on the hub or in a container to prevent misplacement.

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 Remove the Lower shock absorber mounting bolt.

 Detach the stabilizer bar from the lower control arm.

Place floor jack under the lower control arm..

(As a safety precaution you could installs a chain through the spring and lower control arm)

 Raise the jack, this will remove the tension on the lower control arm.

 Support the break assembly with a jack stand or hydraulic jack.

 Remove the Lower ball Joint retaining cotter pin.

 USE EXTERRM CAUTION TO PERFORM THE FOLLOWING:

Loosen the Lower ball Joint retaining nut and back off a few threads. With a 1” diameter brass rod, 4’ to 6” long, rap the top of the Lower ball Joint with a 2 pound hammer to break it free from the taper lock.

 Remove the Lower ball joint nut, clean and store.

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 Support the break assembly to prevent this from lowering with the control arm.

Lower the control arm SLOWLY and remove the spring from the housing.

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 Clean and inspect the area. Remove the safety chain if required.

 Inspect the lower ball joint for wear by moving it around in the assemble, look for less than 1/8 inch off play. Replace as required.

 Verify orientation of the spring (which end is up) and install the Air Bag into the new spring, ENSURE the Schrader valve is facing down.

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 Install the spring into the housing assembly and slowly jack the lower control arm up. Line up the Lower ball joint as you progress.

USE EXTREEM CAUTION AS THIS MAY LIFT THE RIG FROM THE JACK STAND.

 

 Install the retaining nut, tighten snug tight, ENSURE to realign the cotter pin hole, adjust as necessary. DO NOT OVER OR UNDER TIGHTEN THIS NUT.

 Install the Lower shock absorber and mounting fastener(s) snug tight.

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 Install the Tire/Rim. Torque fasteners evenly in a star pattern to 90 Ft. Lbs.

Verify torque in a clock wise pattern until no movement is observed.

 Install the retaining nut, tighten snug tight, ENSURE to realign the cotter pin hole, adjust as necessary. DO NOT OVER OR UNDER TIGHTEN THIS NUT.

 Install the Lower shock absorber and mounting fastener(s) snug tight.

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 Install the Tire/Rim. Torque fasteners evenly in a star pattern to 90 Ft. Lbs.

Verify torque in a clock wise pattern until no movement is observed.

Repeat instructions for opposite side.



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Comments

# COOPERHAWK
Sunday, January 21, 2007 12:16 PM
Nice Job! Hope I don't have to do it, but now I could.
# klattu
Sunday, January 28, 2007 4:48 PM
Whew!
Would not wat to do that again.
Glad mine alread has them.

Looks like I'll be 'going in' for front wheel bearings.
They sound rough.
Anyone know parts # ?
Do you ask for P-30 parts?
Or 1 ton GM truck parts?
# OldFed
Friday, March 30, 2007 8:36 AM
Where did you get your airbags and what was cost
# Tori
Saturday, September 08, 2007 8:08 PM
Does any one know how much air pressure should be in the front air bags for the P30? I had mine replaced a year ago and do not remember how much pressure to keep them at. I have a 37' Winnebago Elandan. I do not know what brand the bags are.
# es Surfer
Sunday, September 09, 2007 10:41 PM
Hi Tori,
I think they should not have less than 10PSI. They should be pressurized according to the load. Here is a link to a lot of information about the P30 Chassis. http://www.offroadtoybox.com/RV/P-Chassis-AlignmentProcess.pdf

I hope this helps,
Es Surfer
# wripley
Thursday, April 24, 2008 2:09 PM
Pleased as punch that I found this DIY article on replacing the air bags on a P30 chassis. I wanted to do it myself but was not too sure if it could be done safely at home. But this is good. Sure glad that there are a bunnch of do-it-yourselfers out there.
Tuesday, October 21, 2008 4:10 PM
I just put new front airbags in my Airstream 345 MH, which is much easier than replacing the coil springs AND airsprings as noted in this how-to. It takes some muscle, but the bags can actually be removed and installed through the hole in the A-arm at the bottom of the coil springs. It took about an hour and some mild swearing, but certainly much less work than replacing the coil springs . . . of course if you need new coil springs as well, you might as well put in new bags while the springs are off the vehicle.

As far as inflation rate goes, the bags are going to vary with vehicle weight. The rating on my 345 is 70 PSI on the front bags.
Scott

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