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Gearbox Timing Dilemma

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  • Gearbox Timing Dilemma

    Ok, I have a gearbox with some timing issues.

    4-1 at zero degrees.

    2-1 slightly past zero.

    1-1 slightly before zero.

    All internal timing marks line up correctly.

    Timing mark on MD/Scissors cam does not line up with follower at 90 degrees.

    Machine runs fine, but has a spotting issue scince the deck shift out of time with the 2-1. (pins wobble) The deck has a slight forward shift when starting from zero and will jam if timing isn't advanced slightly. It has been like this for a long time, but now I'd like to fix it since I have time.

    What do you all think? Twisted keys in 1-1 AND 4-1? [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] I replaced 2-1 yesterday with no change.
    <span style="font-style: italic">Sometimes it is best to use good advice from many individuals to achieve the ultimate result.</span>

  • #2
    Re: Gearbox Timing Dilemma

    Adam:
    Most likely twisted one to one key. As concerning the two to one, they will be short a few degrees at the rake crank, when in lowest position. Therefor, will appear slightly advanced at 0.
    Roscoe.
    rfm

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    • #3
      Re: Gearbox Timing Dilemma

      sounds like the 1:1 is twisted to me too. Had the similar symptoms on #1 [img]/content/btubb/images/%%GRAEMLIN_URL%%/mad.gif[/img] , turned out that the 1:1 key was sheared fron the shaft.
      Best of luck [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]
      Mark
      (919) 757-1789

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      • #4
        Re: Gearbox Timing Dilemma

        I have one like that to. I try not to think about it too often. One of these days I keep telling myself.
        Marty

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        • #5
          Re: Gearbox Timing Dilemma

          Thanks guys, it was a twisted key in the 1-1 spur gear. Runs great now.

          Now I only have 6 more 1-1s in need of work.
          <span style="font-style: italic">Sometimes it is best to use good advice from many individuals to achieve the ultimate result.</span>

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