Short answer
Build the schedule from the engine and generator makers’ manuals and the testing standard that applies to your site, such as NFPA 110. Typical programs combine frequent inspections, regular exercise under load, and periodic oil, filter, coolant, and fuel service.
Frequent inspections
Walk-around checks commonly cover oil and coolant levels, leaks, block heater operation, battery condition, fuel level, and alarms. Your manual and standard set the frequency.
Exercise and load testing
Generators are exercised on a schedule set by your testing standard and engine maker. Run under adequate load or use a load bank to avoid light-load problems.
Periodic service
Oil and filter changes, fuel filter changes, coolant testing, air filter inspection, and belt and hose checks follow the maker’s hour and calendar limits.
Annual and long-term items
Fuel testing, coolant replacement at the maker’s interval, transfer-switch testing, and a full load test are common annual or multi-year items. Record everything.
Frequently asked questions
How often should a standby generator be serviced?
At the intervals the engine maker and your testing standard set; many sites inspect frequently and service at least annually.
What does NFPA 110 require?
NFPA 110 sets installation, maintenance, and testing requirements for emergency and standby power systems. Use the current edition and your authority having jurisdiction’s interpretation.
Should I change generator oil every year?
At least at the engine maker’s calendar limit, which is often about a year for standby units. Check the manual.
General maintenance information. Always follow your vehicle or equipment manufacturer’s requirements and the current product data. Questions? Email [email protected].
