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16 SERVICE AND MAINTENANCE Troubleshooting Guide DANGER Before servicing unit, wait for all moving parts to come to a complete stop. Turn engine off and remove the spark plug wire. PROBLEM POSSIBLE CAUSE CORRECTION Loss of Vacuum. Unusual vibration or noise. Unit difficult to close. 1. Blower, hose or hood inlet clogged. 2. Bags full. 3. Fan blades bent or broken. 4. Poly mesh plugged. 1. Solid object jammed in unit. 2. Loose or missing bolts on unit. 3. Bent or damaged fan. 1. Obstructions keep