Why does a bent louver actuator crank arm lock the blades

Plain-English answer

If an actuator hums but the blades stay frozen, the problem may be linkage alignment, a bent crank arm, a jammed torque bar, or frame distortion—not the controls alone.

Disconnect power/control as required, manually verify blade travel, and inspect the linkage. Replace bent hardware or reseat the linkage on the proper flat/shaft position, then cycle the actuator only after the blades move freely.

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Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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