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There is such a concept as 'too much grease' but that depends on the cold and working viscosity of the grease in question, and the tolerances within the gears. Imagine a sliding scale between too little and too much - maximum grease (ie. packed until no air remained) would impinge movement not aid it. Too much could increase mechanical drag not reduce it The advice here is good for gears as well as bearings http://www.streetdirectory.com/travel_guide/119954/technology/greasing_bearings___how_much_is_enough63.html