Poorly aligned shafts and machine seating are responsible for many machine problems such as vibration and premature breakdowns. Tests have shown that incorrect alignment is the cause for around 50% of machine breakdowns as loading of shafts are dramatically increases due to the reaction forces created within the coupling. Mounting of slewing ring bearing in proper structure is crucial to properly distributing bearing load and stress. Flatness runout will affect bearing performance is no conformance will in time affect the performance of the seals, pinions, gears, and bolts.