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Fan is not on level ground Turn off fan, and relocate unit to smooth level surface. 2. Loose pulley or belt Tighten Hex screw to tighten Motor Pulley. See page 3 for for belt tightening instructions. 3. Motor bolts are not secure Tighten Motor Safeguard bolts and 4 motor bolts. 4. Defective fan bearings Replace Fan Bearings. Pinnacle Products International, Inc. reserves the right to make any changes in materials, specifications, prices or design without notice. Pinnacle Products International,