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Peterbilt / 6NZ Vibration

Discussion in 'Trucks [ Eighteen Wheelers ]' started by jaysolomon, Sep 22, 2010.

Page 5 of 5
  1. Jul 26, 2018 #41
    truck 307

    truck 307 Light Load Member

    178
    315
    Aug 11, 2014
    0
    I agree on the camper. Motor mounts done 3 years ago and I checked to be sure they aren't the light pink ones that are hard as steel and cause all vibrations and noises to transmit through cab. The new mounts are the old school black style.
    I'm calling CAT today re balancer swap out. I'm sure I'll be asked to bend over.
     
    truck 307, Jul 26, 2018
    truck 307, Jul 26, 2018
    #41
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  3. Aug 3, 2018 #41
    truck 307

    truck 307 Light Load Member

    178
    315
    Aug 11, 2014
    0
    Replaced tranny and PTO ( drive bearungs worn )much of my problems gone but still vibration once I'm up over 30 mph, loaded / empty, all the same.
    I was told by Peterbilt my ride height should be 8.5", measured from bottom of frame to center ( weld line) on axle housing, which it is.
    Dumped air for 2 seconds when vibration exists to test, no change.
    Leveling valve is 2 years old .
    U joints seem good, no play. Hanger bearing also good.
    Is there a adjustment for front drive which some air valve controls other than levelling valve ?
    Don't get me wrong, what I mean is, I know the leveling valve controls ride height, but does that air pressure from the leveling valve go to an other valve which controls the height of the forward drive axle?
     
    truck 307, Aug 3, 2018
    truck 307, Aug 3, 2018
    #41
    SAR Thanks this.
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