Kubota generator shuts down with E18; controller indicates 'Oil Temperature High' or 'Engine Oil Overheat'.

Safety first: Allow the engine to cool fully before touching any oil lines or components. Hot oil can cause burns.

• Check oil level: Verify oil level on the dipstick and top up with the correct Kubota-specified oil if low.
• Inspect oil cooler: Locate the engine oil cooler (air-to-oil or coolant-to-oil). Clean external fins with compressed air and check for blocked coolant flow if integrated with the cooling system.
• Check for overload: Review the load profile during the shutdown. If the generator was running at or above rated capacity for long periods, reduce load or upsize the generator.
• Sensor check: Inspect the oil temperature sensor and wiring. Test sensor resistance vs. temperature and replace if out of specification.
• Engine health: Persistent oil overheat may indicate internal engine issues (bearing wear, restricted oil passages) and should be evaluated by a Kubota service technician.