KW AG-400 bag replacement

Disconnect the leveling valve and raise the truck as high as it will go support the frame with jackstands and then let the air out of the bags with the valve. Sometimes you have to unbolt the lower shock mounts.

 

Ive had luck with plugging the air supply to each bag and raising it up and changing each bag one at a time,no jack stands you can use blocks between the axle and axle stop

 

Last march i used a blower nozzle on one bag, a helper and was able to replace all 4 bags using on bag to lift the frame enough to get the others out.


ETA:

Use a rubber tip blower nozzle.

 

No better way to do it! Even safer than jackstands.

 

I have ran the front drive axle up on blocks to change the rear bags, the run the rear drive on blocks to change the fronts. You might need the axle interlock engaged depending on how big your blocks are.

Bill

 

Another reason for disconnecting the leveling valve is that you will have to pick it up off of the blocks.

Same here.
Not sure on the AG400, but on my AG100, I left the brackets on the truck. Much easier unbolting it from the air bag than the frame.
Be sure to use thread sealant on the air fittings.

Another tip: I collapse the air bag in a vise, then tie it off with hay string. Makes it real easy to slip into place.

 

Hanadarko,an alternative way off doing it:
Dump the air from the bags.
Tie off all the airbags you want to replace on the same axle.
Then raise the airsuspension.
On a bobtail you should have no problem raising it.

I have also in the past used a block between the chassis and the axle.

And then there is the log method.
Raise the truck as high as it goes.
Measure the distance between the chassis and the ground.
Cut 2 logs out off a tree.
Put then at the back 2 corners off the chassis.
You do need a tree that you can cut

 

I have done the same. It also works for changing tires when I don't have a jack around.