Kubota standby generator vibrates excessively during operation, causing rattling noises from the enclosure.

Safety first: Do not place hands near moving belts or fans while the engine is running. Wear hearing protection if noise is high.

• Inspect mounting: With the engine off, check that all engine and alternator mounting bolts are tight. Look for torn or oil-soaked rubber mounts and replace as needed.
• Check base frame: Ensure the generator base is securely anchored to a solid foundation and that all anchor bolts are tight.
• Fan and pulley: Inspect the engine cooling fan and pulleys for missing blades or weights. Replace damaged components.
• Rotor balance: If vibration is severe and speed-dependent, the alternator rotor may be out of balance. This requires professional balancing or alternator replacement.
• Coupling alignment: On sets with a flexible coupling between engine and alternator, verify alignment per Kubota specifications using a dial indicator or feeler gauges.