air ride height

Discussion in 'Kenworth Forum' started by plowboy1637, Sep 2, 2012.

  1. plowboy1637

    plowboy1637 Bobtail Member

    Feb 1, 2012
    durand mi.
    Could anyone tell me how to properly measure the air ride height on a 03 w-900 with ag-400 air ride. Like where to measure and what measurement, have heard a lot of different ways and measurements and was wondering which way is right.
  2. Worthken

    Worthken Light Load Member

    Jun 2, 2012
    Delmas South Africa
    have you tried a search on the forum. There was a discussion about this not long ago. Members Bender, and Pablo would possibly be able to point you in the right direction.
  3. Hanadarko

    Hanadarko Independent Owner/Operator

    Oct 1, 2009
    I was just about to say that.
    For the sleeper, I use a level but for the rig, I eyeball it.
    There is a thread on here with some comments and I believe measurements too...if you want to get that specific...
  4. Les2

    Les2 Road Train Member

    Jul 25, 2008
    kicked back in my lazyboy...
    If you call KW they will tell you what the height is and where to measure it...
  5. flc120

    flc120 Heavy Load Member

    Jul 11, 2012
    Miami,FL (yeah i know :( )
    i usually air bags to where the suspension raises the frame just right where the top of the tire meets the top of the frame. unless you have a different rim size listed from factory or youre a car hauler.
    Hanadarko Thanks this.
  6. KWmech

    KWmech Light Load Member

    Jun 16, 2012
    Usually 8.5" from the center line of the axle to the bottom of the frame rail
  7. rollin coal

    rollin coal Road Train Member

    Mar 29, 2008
    Get the spec's from your local service dept. They can print them off for you. Mine (AG380) says on level ground in unladen condition 8.5" (this from memory and the previous poster) from the bottom of the frame rail to the center of the rear axle housing (read that the center of the axles themselves). The center of the axle housing is NOT the weld along the middle of the two half sections of the axle housing tubes slapped one on top of the other - remember the axle housing is angled upwards - if you measure to that weld as the "center" you will be off... It is the center of the housing but not the axles themselves.... Takes about 5 minutes to call up and find out the correct spec that 8.5" number above is dead on centered between the low and high end of what is allowable - there is about a 1/2" to play with.
  8. cowcatcher

    cowcatcher Light Load Member

    9 3/4"- 9 7/8" from bottom of frame to center of axle housing.
  9. cumminsISB

    cumminsISB Light Load Member

    Feb 5, 2011
    D'Lo, Ms
    Not to beat a dead horse but.....Mine has got to be off. Measured from bottom of frame rail to weld. Just to be sure what you are saying is to measure from bottom of frame rail to the center of the axle...little indention on it from the front side?
  10. rollin coal

    rollin coal Road Train Member

    Mar 29, 2008
    There's really no mark or indentation on mine. I measure from the bottom of the frame rail to the center of the weld on the back of the housing. Then measure down to the center of the weld on the front side of it. Split the difference between the two. So if the difference is 1" then on the backside of the housing you should measure to 1/2" above the center of the weld. That puts you in the exact center of the axle. Hope it makes sense. Would be easier to show you than try to explain on a forum.
    cumminsISB and Dirty-Low-Walker Thank this.
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