Can we talk about the Detroit Bull Gear?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hanadarko, Mar 27, 2012.

  1. Kristrans

    Kristrans Bobtail Member

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    Jun 7, 2017
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    I did over 1.9 miles
     
  2. dlstruck

    dlstruck Medium Load Member

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    Sep 8, 2016
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    Here is my bull gear. The valve lash was still in spec and the bull gear had almost no play. It's not something that I would've caught just by taking an accessory drive off. This came off a 97 FLD with 1.5 million. Not sure if it was ever replaced or not.

    [​IMG]

    On a side note, in 2003 Detroit went to a compact geartrain and it's a lot beefier. That's what both a Detroit mechanic and the guy who I bought my remanufactured bull gear from told me. Apparently those don't have a taper bearing anymore and don't fail. I will confirm this when I take my 2003 apart to fix an oil leak behind the front cover.
     
  3. Truckin2Eat

    Truckin2Eat Medium Load Member

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    Jul 2, 2013
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    My 06 Columbia detriot bull gear went bad. And it was smoking like a freight train every morning start up for about 3 to 5 min.
     
  4. dlstruck

    dlstruck Medium Load Member

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    Sep 8, 2016
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    Good to know. What went bad on it, the bearings? And how was it causing it to smoke?
     
  5. Truckin2Eat

    Truckin2Eat Medium Load Member

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    I had to replace bearing and all. Guy said it jumped timing. New bull gear solved everything.
     
  6. dlstruck

    dlstruck Medium Load Member

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    Sep 8, 2016
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    Did it jump from the bearing being so loose or did it break teeth?
     
  7. 86coe

    86coe Bobtail Member

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    Jan 26, 2018
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    Could you email me the service manual?
     
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