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IH 1998 starts hopping

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ninehk, Aug 11, 2020.

  1. Aug 11, 2020 #1
    ninehk

    ninehk Bobtail Member

    20
    3
    Jun 10, 2020
    0
    It starts hopping when loaded mostly in reverse when trying to back into a door it just won’t stop hopping sometimes when starting on a incline but that’s randomly and when empty it still hops but only in sometimes. Could this be a clutch issue or a fifth wheel problem ?
     
    ninehk, Aug 11, 2020
    ninehk, Aug 11, 2020
    #1
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  3. Aug 29, 2020 #2
    whet1961

    whet1961 Bobtail Member

    18
    10
    Jul 19, 2016
    0
    Check your motor mounts, front and rear. My '98 9400 IH with an N14 cummins hops and carries on when I take off loaded on a hill goin forward, but I can take off backwards loaded up a hill and it's smooth as silk. I replaced the clutch and didn't help so someone suggested the motor mounts. the one on the passenger side is broken and I'm replacing them both right now. It's a nasty job on this truck. I'll let you know if it helps. I've had this problem with other IH's I've driven when I was a company driver for other outfits. Seems like it might be common for these.
     
    whet1961, Aug 29, 2020
    whet1961, Aug 29, 2020
    #2
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