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Old 01-19-2020, 05:59 AM   #1 (permalink)
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Default Extra shim between main gear and lower bearing block

I have a second hand logo 700 that I just took apart to change the main shaft and found that the last owner added an extra shim to the bottom of the drive train between the main gear and bottom bearing block. Manual does not show one here and also says main gear should have 1mm of axial play. With the shim there is no play but I don't really see how it would negatively affect flight. Obviously it was working well like this. Question, now should I leave the shim or take it out ?
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Old 01-19-2020, 09:37 AM   #2 (permalink)
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Remove it. The small play allows slight movement to keep the herringbone gears meshed perfectly. They are sensitive to being perfectly centered.
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Old 01-20-2020, 08:28 PM   #3 (permalink)
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+1 on removing it! You got to let the main gear float up and down during rotation. If everything is bound up you will most likely put too much stress on the gears and probably create some bad vibrations. Good luck!!
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Old 01-21-2020, 09:54 AM   #4 (permalink)
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I know some people who do that because “otherwise the one way bearing will destroy itself during overspeeds”. I don’t really believe that and i would suggest to follow the manual and have the suggested 1mm play. They suggest it for a reason
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