I recently destroyed a bearing spindle on my 54" deck. Hit a stump and broke the bearing housing. All fixed with used and new parts.
Is it possible you hit something and cracked the spindle housing? Is a shaft/pulley deflecting under operational load? Is a pulley deflecting on the shaft?
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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