Motor shaft runout is checked to make sure of proper __________.

• A. Alignment of mating components
• B. Run out
• C. Torque
• D. Speed

Answer: (A)

Motor shaft runout is checked to verify that the motor shaft and the components it connects to are aligned to spin on a common axis. When runout is within tolerance, the shaft, pulley, coupling, gear, or belt-driven parts sit true with each other, ensuring smooth torque transmission and reducing uneven bearing loads and vibration. If runout is excessive, it indicates misalignment or mounting issues that can lead to wear, overheating, and premature failure. Torque and speed are determined by the motor and drive system, not by runout, so the purpose of the check is purely to confirm proper alignment of the mating components.