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General with a long screwdriver or small iron bar against Bending bearing cover, ear post with a screwdriver handle, you can hear the sound coming out of the bearing rotation. Normal three roll bending machine for high frequency continuous motor sound, and the sound bearing short of oil or failure of intermittent rattling sound. If the high frequency sounds mixed with slight intermittent rattling sound explanation bearing little oil, but does not affect the operation, usually 1-3 months to open no problem, intermittent low-rattling