Generator vibrates excessively during operation, causing rattling noises or movement.

Safety first: Keep clear of moving parts while the generator is running. Shut down before tightening any hardware.

Steps:

• Check mounts: Inspect rubber isolators between the generator frame and base. Replace any that are cracked, oil-soaked, or collapsed.
• Tighten hardware: Verify that all frame-to-pad anchor bolts are tight.
• Engine performance: Listen for misfires or uneven running. Replace spark plugs and check ignition components if misfire is suspected.
• Rotor balance: If vibration persists with good mounts and smooth engine, alternator rotor balancing or replacement may be required by a specialist.