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Bull Gear

Discussion in 'Freightliner Forum' started by Jerryfrancis, Mar 5, 2013.

  1. Mar 5, 2013 #1
    Jerryfrancis

    Jerryfrancis Bobtail Member

    10
    1
    Jan 29, 2013
    Durham region Ontario
    0
    I have a Series 60 and I have fixed almost everything on this truck except the Bull Gear, I have a engine vibration that obviously is causing it to shake. only does this when im driving it not when im idling, anything else that I should look at?
    I just did the injectors, the head and the ECM
     
    Jerryfrancis, Mar 5, 2013
    Jerryfrancis, Mar 5, 2013
    #1
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  3. Mar 5, 2013 #2
    pawpaw1

    pawpaw1 Medium Load Member

    396
    145
    Sep 9, 2011
    Dallas,Ga.
    0
    Hummm . Harmonic Balancer ? Carrier Bearing ? U-joint ? I'd Guess carrier bearing , or u-joint. Start around 60 ? U-joint ,almost certainly . At most any speed , maybe hear a clanging sound , or other unusual noise ? Carrier Bearing. Loose wheels ,maybe , but doubtful.
    If your sure its the engine , how many miles on it ? Harmonic Balancer needs to be replaced by 500,000 miles , for sure.
     
    pawpaw1, Mar 5, 2013
    pawpaw1, Mar 5, 2013
    #2
    Jerryfrancis Thanks this.
  4. Mar 5, 2013 #3
    Jerryfrancis

    Jerryfrancis Bobtail Member

    10
    1
    Jan 29, 2013
    Durham region Ontario
    0
    The truck has 3 million km, motor was rebuilt at 2 million km.
     
    Jerryfrancis, Mar 5, 2013
    Jerryfrancis, Mar 5, 2013
    #3
  5. Mar 5, 2013 #4
    TruckingSurveyor

    TruckingSurveyor Light Load Member

    133
    43
    Jan 28, 2013
    Oregon
    0
    PawPaw1 has some good comments, if it happens at a certain road speed regardless of RPM or gear, likely behind the transmission, u-joints, carrier bearing, axles, wheels, etc., if it is strictly RPM related then likely in the engine and if that is the case the harmonic balancer is a good guess.

    TS
     
    TruckingSurveyor, Mar 5, 2013
    TruckingSurveyor, Mar 5, 2013
    #4
  7. Mar 5, 2013 #5
    losttrucker

    losttrucker Road Train Member

    1,436
    1,037
    Mar 9, 2008
    greenville,nc
    0
    Yea I had a "mysterious" unknown, couldnt find vibration ordeal for a week. Monday morning leaving the yard the u-joint broke and left the drive shaft lying in the road.

    First time in 5 years I ever had to ride a hook.......
     
    losttrucker, Mar 5, 2013
    losttrucker, Mar 5, 2013
    #5
    Pumpkin Oval Head and Jerryfrancis Thank this.
  8. Mar 5, 2013 #6
    Jerryfrancis

    Jerryfrancis Bobtail Member

    10
    1
    Jan 29, 2013
    Durham region Ontario
    0
    looks like i may be having to fix the harmonic balancer and bull gear, everything else that was mentioned has been fixed and looked at , unless it may be something else, ....................Thanks for the reply everyone, every suggestions helps
     
    Jerryfrancis, Mar 5, 2013
    Jerryfrancis, Mar 5, 2013
    #6
  9. Mar 5, 2013 #7
    jbourque

    jbourque Heavy Load Member

    924
    553
    Oct 25, 2012
    south english iowa
    0
    a bull gear is tough to change. 1 case bud lite, better part of a afternoon, b/s time with old friends good day.
     
    jbourque, Mar 5, 2013
    jbourque, Mar 5, 2013
    #7
    Jerryfrancis Thanks this.
  10. Mar 6, 2013 #8
    rebel127

    rebel127 Light Load Member

    296
    149
    Feb 28, 2011
    monroe ct
    0
    The clutch can also cause rpm related vibrations.
     
    rebel127, Mar 6, 2013
    rebel127, Mar 6, 2013
    #8
    Jerryfrancis Thanks this.
  11. Mar 6, 2013 #9
    TIGERSHARK3060

    TIGERSHARK3060 Bobtail Member

    2
    1
    Mar 6, 2013
    0
    If the bull gear has 1 mil miles on it. Replace it period. If the bull gear fails. You will be doing a whole inframe on the engine which at 1 million miles I would do anyway.
     
    TIGERSHARK3060, Mar 6, 2013
    TIGERSHARK3060, Mar 6, 2013
    #9
    Jerryfrancis Thanks this.
  12. Mar 6, 2013 #10
    rebel127

    rebel127 Light Load Member

    296
    149
    Feb 28, 2011
    monroe ct
    0
    Very true!!!
     
    rebel127, Mar 6, 2013
    rebel127, Mar 6, 2013
    #10
    Jerryfrancis Thanks this.
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