Unbalance is often the source of excess vibration in rotating equipment. Out-of-spec vibration will shorten the life of your bearings and fatigue other components. Dynamic balancing in the field can remove this potential damage.
This is one of the tools used in Root Cause Analysis, using the vibration signaure of your equipment to diagnose problems and recommend solutions.
Vibration surveys show the current and future condition of your equipment to provide a heads-up for preventative maintenenace planning.