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Symptoms include significantly increased overall machine vibration, faster bearing temperature rise, belt flapping, and loose frame anchor bolts. Remove the pulley/flywheel for on-site dynamic balance correction, keeping residual unbalance within G6.3.

Common causes: incorrect pulley groove type, non-parallel or misaligned pulleys, excessive or insufficient tension, dust contamination on the feed side, and pulley grooves worn into a bell mouth. Correct pulley parallelism and tension to the specified value.

Check gear backlash and contact pattern. The contact pattern should cover at least 40% along tooth height and 70% along tooth width. If backlash is too small or too large or contact is biased, adjust bearing housing shims or re-scrape the gears.