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If you have a heavy enough floor jack to keep the body suspended high enough to stretch the airbag to full length, you'll need it. Jack up the body. In the Peterbilts, I can't remember whether the air line goes in from the top or the bottom... if it's that air ride suspension specifically designed for dump trucks, probably the top. The air line should be connected with a quick connect - stick a slotted screwdriver into the outer sleeve as you push in the air line, until you click the unlocking mechanism. Once that's done, it should expose a hex nut. Unbolt that nut. From that point, you should be able to remove the air bag by turning it counterclockwise. Install the new airbag, and follow the above steps in reverse order.

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Q: Replace air bag on peterbuilt dump truck?
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