Generator is excessively noisy during operation compared to normal

Safety: Disable automatic start. Keep hands and tools away from moving belts and fans while the engine is running.

• Identify noise source: Run the generator with the enclosure open (if safe) and listen carefully to locate whether the noise is from the engine, alternator, or exhaust.
• Inspect exhaust system: Check for loose clamps, cracked flex joints, or broken hangers. Tighten or replace components as needed.
• Check engine and alternator mounts: With the engine off, inspect rubber mounts for cracking or separation. Tighten mounting bolts to CAT torque specs.
• Look for contact points: Ensure no sheet metal, conduit, or wiring is vibrating against the engine or frame.

Loud knocking, metallic banging, or sudden changes in noise may indicate internal engine damage and should be investigated by a CAT technician immediately.