CH613 hop/shake

Discussion in 'Mack Forum' started by cmulli56, Sep 22, 2019.

  1. cmulli56

    cmulli56 Bobtail Member

    Sep 22, 2019
    Hey guys, I have an 03 613 day cab that started to develop a shake in both the steering wheel and seat. Brought it into a commercial alignment shop and they went through the whole thing. Removed axle shafts, inspected and greased drive shafts, checked alignment on the whole system and adjusted air levels. They said it should probably need new tires, so I went and ordered 10 new tires, Hercules to be exact. I know they’re not Michelin’s/Firestone’s but the truck also only runs interstate. And we’ve always had great luck with them. It was better, no shaking or hopping but now recently it has been doing it again. I guess I don’t know what it could be, when I look back I can see the back axle hopping when it’s over 60 mph, loaded it’s more worse, empty not as much but it’s still there. I can feel it in the seat and then see it on the mirrors. The only thing I can think of is either taking the steer tires in to get balanced, or purchasing Centramatic balances. Unless it is something that is internal. Any help is greatly appreciated, I’m 23 and getting into hauling and it sucks having to pay $100+ an hour to figure out a shake and getting nothing resolved. Thank you!
  2. RaRa

    RaRa Light Load Member

    Jan 17, 2018
    maybe it has a bent wheel?
  3. Dave1837

    Dave1837 Light Load Member

    Nov 16, 2019
    Sounds like a bearing in the rear end
  4. "semi" retired

    "semi" retired Road Train Member

    Apr 16, 2014
    high plains colorado
    Harmonic balancer? Engine/trans mounts, weight flew off the driveshaft(s) or U-joints. Bent rim, did you run over something or hit a curb? I'd find it quick, you don't want to start a funky pattern with new tires.
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