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Air suspension ride height not level

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kenllah, Apr 2, 2019.

Page 1 of 3
  1. Apr 2, 2019 #1
    Kenllah

    Kenllah Light Load Member

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    Have a 1998 international 9400. I've been having vibrations issues with it when loaded. I measured the suspension bump stop gap distances today on level ground. They are all just a hair over 2.5 inches except the passenger rear, it is 1.75 inches. Loaded truck.
    I have changed the spring, air bag, and leveling valve.
    Any ideas what would cause this. Frame appears straight. It's not cracked or broke.
    Teflon wear pads look good.
    Believe it's hendrickson suspension with the Z springs
     
    Kenllah, Apr 2, 2019
    Kenllah, Apr 2, 2019
    #1
    Rideandrepair Thanks this.
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  3. Apr 2, 2019 #2
    Rideandrepair

    Rideandrepair Road Train Member

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    Did you check the spring bushings? On my Truck the right rear was worn the most, due to more torque to that wheel, I suppose. I’ve noticed that on other Trucks like mine (Freightliner).
     
    Rideandrepair, Apr 2, 2019
    Rideandrepair, Apr 2, 2019
    #2
  4. Apr 2, 2019 #3
    Kenllah

    Kenllah Light Load Member

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    There are no bushings
     
    Kenllah, Apr 2, 2019
    Kenllah, Apr 2, 2019
    #3
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  5. Apr 2, 2019 #4
    Rideandrepair

    Rideandrepair Road Train Member

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    I should have said spring hanger bushings.
     
    Rideandrepair, Apr 2, 2019
    Rideandrepair, Apr 2, 2019
    #4
  7. Apr 2, 2019 #5
    Kenllah

    Kenllah Light Load Member

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    No bushings at all
     
    Kenllah, Apr 2, 2019
    Kenllah, Apr 2, 2019
    #5
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  8. Apr 2, 2019 #6
    Rideandrepair

    Rideandrepair Road Train Member

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    You mean they’re wore completely out they’re gone? I’m talking about the bushings that the Eye bolt goes through, on front of the air spring.attached to the spring hanger.Your Truck should have them.
     
    Rideandrepair, Apr 2, 2019
    Rideandrepair, Apr 2, 2019
    #6
  9. Apr 2, 2019 #7
    Kenllah

    Kenllah Light Load Member

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    There are no bushings on this hendrickson suspension. Never have been. Airliner suspension on freighter is different design
     
    Kenllah, Apr 2, 2019
    Kenllah, Apr 2, 2019
    #7
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  10. Apr 2, 2019 #8
    Goodysnap

    Goodysnap Road Train Member

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    Is the drive line in phase? Dont think measuring ride height at the bumpers is correct. Right height is usually measured axle center to bottom of frame? Not certain on the spec for this chassis. @Heavyd.
     
    Goodysnap, Apr 2, 2019
    Goodysnap, Apr 2, 2019
    #8
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  11. Apr 2, 2019 #9
    Kenllah

    Kenllah Light Load Member

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    It's out there too. I measured it a while back . Don't have the numbers but I do remember it was off by a similar amount. Drive line has never been separated. Yes it's in phase. Only happens when loaded
     
    Kenllah, Apr 2, 2019
    Kenllah, Apr 2, 2019
    #9
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  12. Apr 2, 2019 #10
    062

    062 Road Train Member

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    It may be a bad spring if it’s only on one side and only when loaded. @Tug Toy had one a couple weeks ago.
     
    062, Apr 2, 2019
    062, Apr 2, 2019
    #10
    Rideandrepair Thanks this.
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