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Think of how fast the bevel gear is turning (fastest) then spur (next fastest), then sector (slowest gear). Bearings may have some wobble to them at these kinds of speeds considering low reduction rate + high motor speed. That may be what causes your gears to get chewed up.
Bushings have no other parts to move or wobble, so tilting of your gears is not as likely to occur.
Shimming may or may not be an issue. Hard to say unless you see it in person.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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