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  • gearbox slop

    First time poster long time bolwtech surfer....Just wondering how you guys check which assy has the slop in it .Tonight I changed the 4to1 to find out it was the 1to1 to make a long day [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] thanks every one here at bowltech for all the great info

  • #2
    Re: gearbox slop

    Columbia:
    I usually check 4-1 play, at approx., 75 to 80 degrees, with deck on deck holding hook. No pressures on crank link or 1-1 cam at that point. It is also the point where the brass wheel exibits the most wear.Unplug mch, at that point and move the crank arm up and down to acertain wear.
    I usually check one to one slop at the point where deck has made its most rearward movement, if I am checking for a loose inside gear. If I'm checking for a loose mdsissors cam, right after 90 strike.
    Hope this is of some help.
    Roscoe.
    rfm

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    • #3
      Re: gearbox slop

      I cycle machine to around 110 degrees, 2nd ball. Unplug machine. Grab moving deck/scissor cam and try to rotate back and forth. If the cam moves, but nothing else does...bad keyway on 1:1 at the cam. If the cam and the 1:1 move, but the 2:1 does not, bad keyway at the gear on the 1:1. To check 2:1, put wrench on crank pin of the 2:1. If it moves, bad 2:1. Next, grab rake crank arm and try to move it. Watch the worm shaft and be sure it doesn't move in and out. Movement there shows bad worm shaft installation or on older style machines, wrong shimming at bearing retainer. If you have no movement at the worm shaft, but crank arm moves up and down, bad 4:1 keyway or worm wheel itself. Change 4:1. Hope all this helps...
      TSM & TSM Training Development
      Main Event Entertainment
      480-620-6758 for help or information

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      • #4
        Re: gearbox slop

        JBEES:
        I have found there to be as much as 1/4 in difference in 4to1 slop, between the measure taken at 75 degrees versus one taken at 90. or after.
        JMO.
        Your friend:
        Roscoe.
        rfm

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        • #5
          Re: gearbox slop

          Roscoe...what would you attribute that to? I'm not being sarcastic...just interested. You've done more of these than I have. I have found more wear at 110 to 135 or so due to that being the spot when the most backlash is thrown onto the worm wheel when the 2:1 begins to pick up the deck from standing pins.(Also 305, 180 degrees later...which is the same physical point on the worm wheel) Have seen worm wheels with almost no teeth left at that point where the worm gear contacts the worm wheel. What do you think?

          [ March 14, 2001: Message edited by: JBEES ]
          TSM & TSM Training Development
          Main Event Entertainment
          480-620-6758 for help or information

          Comment


          • #6
            Re: gearbox slop

            JBEES:
            4 to 1 failures have one thing in common, that being the relative position of the crank at the time of failure. They will either fail with the rake nearing the rear row of pins or with the deck nearly up from setting a new rack, both of which occur with crank at the 75 to 80 degree position in relation to 90 degrees. As you stated earlier, it could be 350, 260,170. But its always before true zero as far as crank position is concerened. The hardest pull on the gearbox is sweeping and lifting the deck at the same time, whuch is why most failures occur with the rake nearly back.
            Your friend:
            Roscoe.
            rfm

            Comment


            • #7
              Re: gearbox slop

              Thank you to all that responded, the info. will definatly be useful. [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]

              Comment

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