A good example of why you need aligned parts Alignment is a critical step of building and repairing rotating equipment, such as motors and pumps. A badly aligned pump will  leak ,  vibrate , and destroy itself quickly. Overlooking alignment will end up costing you money in the future in the form of destroyed and damaged equipment. It’s very important to consider the method of alignment, as laser vs dial indicators have different advantages and disadvantages.  Laser Indicators