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Thread: Motion Sound Kbr3d rotor problem

  1. #1
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    Motion Sound Kbr3d rotor problem

    I purchased a used KBR3d earlier in the summer. I have a problem with the spinning high rotor rubbing 2 mounting bolts. It has a new drive belt. I have new o-rings too but I can't figure out how to pull out the rotor shaft out to look. 1/16 of an inch or less would solve it. Do I have to pull out the horn driver from underneath? From what I've read its a similar mechanism to the Pro145 or the Pro3x. Looking for some direction. It's all apart, chassis is removed and on my bench resting on a couple of 2x4s...

    Thank you,

    Mike Skory
    Lansing, MI

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  2. #2
    Lifetime Member Enzo's Avatar
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    I know the old Leslie, but I don't know this mechanism.

    But, could you add another rubber O-ring under the things to lift the motor a tiny bit?

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    That's exactly what I was thinking Enzo. Or maybe the new o-rings being slightly little fluffier would do the trick. 1/32 " would clear it. But I can't see how to get it apart. Motion Sound is not responding. My next option (other then brute force) is to remove the horn driver from underneath in hopes I can see a little more.

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    Motion Sound KBR-3D

    I heard back from Motion Sound. Super helpful! Normally the plastic horn pulls straight up and off with just a little pressure Mine was stuck solid. It took a lots of pressure, wiggling and prying. Was sure I was going to break it! I found a total of 7 o-rings. 3 small 007N70, 2 medium and 2 larger. Grainger had the smalls but ordered the others for me today.

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    The 3 small 0-rings are on top to buffer a top support bracket. The 2 larges go around the 2 bearings (I think). the 2 mediums keep the bearings from rubbing against the plastic of the horn. The mediums were fused to the plastic horn. One from the top and one from the bottom. I want to notate this because I found so very little repair info on line. Will post again after I get the rest of the o-rings.

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  5. #5
    Lifetime Member Enzo's Avatar
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    Good hardware stores and places like Lowes and Home Depot usually have selections of O-rings. They would be in that section of hardware with the cardboard drawers full of odd pieces, like thumb screws, clevis pins, etc.

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  6. #6
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    Fixed! Basically I replaced all 7 o-rings into the same positions. Except instead of 3 smalls at the top, I put 2 smalls at the top and one at the bottom to raise it a little. Drilled 3 small holes to re positions the plastic top shaft holder.

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