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Transmission Hum

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Box-o-rocks, Jun 7, 2016.

  1. Jun 7, 2016 #1
    Box-o-rocks

    Box-o-rocks Bobtail Member

    7
    2
    Feb 28, 2016
    0
    I've got an RMO 13-145A tranny. Lately when deccelerating and in 7th position direct drive, sometimes in 7th overdrive position too, I get a harmonic hum with a buzzing sound. All else works normal. Only happens when coasting/ deccelerating between 35-45mph. Anyone had this experience? Im thinking a worn output shaft bearing, but wanted to get some input from the experienced folks in this forum. All help will be greatly appreciated.
     
    Box-o-rocks, Jun 7, 2016
    Box-o-rocks, Jun 7, 2016
    #1
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  3. Jun 13, 2016 #2
    dustinbrock

    dustinbrock Road Train Member

    1,308
    901
    Apr 19, 2012
    North Battleford, SK
    0
    I had similar issue with my volvo. turned out to be worn slipper pads causing my driveline angle to be off.

    Check fluid level, driveline angles/ride height, steady bearing.
     
    dustinbrock, Jun 13, 2016
    dustinbrock, Jun 13, 2016
    #2
  4. Jun 14, 2016 #4
    Box-o-rocks

    Box-o-rocks Bobtail Member

    7
    2
    Feb 28, 2016
    0
    Problem found, it was a worn pinion bearing in the rear rear differential.
     
    Box-o-rocks, Jun 14, 2016
    Box-o-rocks, Jun 14, 2016
    #4
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