Free emergency standby generator annual service procedure

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Free standby generator annual service checklist (PDF-ready). Engine service, alternator test, load test and NFPA 110 / AS 2941 compliance. Download free.

Jarrod Milford

Commercial Director

Updated 3 May 2026

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Benefits of using this emergency standby generator annual service procedure

• Proven reliability: a 2-hour full load test proves the generator can sustain continuous operation under maximum demand, not just start and run unloaded.
• Safety system verification: testing all safety shutdowns (high temp, low oil, overspeed, overcrank) confirms the generator will protect itself and connected systems during a fault condition.
• Engine longevity: annual oil, filter and coolant changes prevent the slow degradation that standby generators experience from infrequent use and long idle periods.
• Fuel quality assurance: draining and cleaning the day tank, polishing stored fuel and replacing deteriorated fuel lines prevents the most common cause of fail-to-start events: contaminated fuel.
• Compliance certification: the annual service is typically required for renewal of the compliance certificate under NFPA 110 and AS 2941. Without it, the building authority may issue a deficiency notice.
• Insurance and liability: documented annual service records protect building owners and facilities managers from liability if the generator fails during an emergency.

How to use this emergency standby generator annual service procedure

1. Notify building management and schedule sufficient time (6-10 hours). Ensure a qualified generator technician is assigned. Arrange a load bank if the building load is insufficient for 100% testing.: Issue a building notice at least 48 hours in advance advising occupants that the generator will be under test. Confirm the load bank delivery and connection plan. Verify the technician holds the required electrical licence for the jurisdiction.
2. Complete all monthly test items first (auto-start, 30-minute run, engine monitoring, transfer switch, alarms). Use the monthly test procedure as a checklist.: Run through the standard monthly test checklist to confirm auto-start, transfer switch operation, engine monitoring and alarm verification are all satisfactory before proceeding to annual-only tasks.
3. Perform the diesel engine full service: drain engine oil, replace oil filter, replace fuel filters, replace air filter, replace coolant or test glycol concentration.: Use the manufacturer-specified oil grade and filter part numbers. After filling with new oil, run the engine for five minutes and recheck the level. Test coolant glycol concentration with a refractometer and replace the coolant if the concentration is outside the 40 to 60 percent range.
4. Perform the alternator insulation resistance test (megger on all windings). Record readings and compare to previous years.: Disconnect the AVR before testing. Apply 500V DC for one minute to each winding (phase to ground) and record the reading in megohms. A minimum of 1 megohm is generally acceptable. Compare results with previous years to identify any downward trend that indicates moisture ingress or insulation degradation.
5. Conduct the full load test: connect the load bank (or use building load), run at 100% rated output for a minimum of 2 hours. Record voltage, frequency, amps and kW at regular intervals throughout the test.: Apply load in increments of 25 percent, allowing the engine to stabilise at each step. Record voltage, frequency, current and kilowatts every 15 minutes throughout the two-hour test. Monitor coolant temperature and oil pressure continuously. The test validates cooling system capacity under sustained full load.
6. Test all safety shutdowns individually: simulate high coolant temperature, low oil pressure, overspeed and overcrank conditions. Verify the generator shuts down and the correct alarm is raised for each condition.: Each shutdown must be tested by simulating the actual fault condition, not by bypassing the sensor. Verify the engine stops, the correct alarm is displayed on the controller and the event is logged. Reset each alarm and confirm the generator returns to standby mode before testing the next shutdown.
7. Service the transfer switch: exercise auto and manual operation, clean contacts, check voltage and frequency sensing. Service the fuel system: drain and clean the day tank, replace deteriorated fuel lines, perform fuel polishing if the generator has been in long-term storage.: Exercise the transfer switch through multiple auto and manual transfer cycles. Inspect contacts for pitting or carbon buildup and clean with an approved contact cleaner. Drain the day tank completely, inspect for sediment or water and flush. Replace any fuel lines showing cracking, hardening or discolouration.
8. Perform the battery load test (replace if CCA is below spec). Inspect exhaust back-pressure, vibration isolator mounts, radiator (clean core, check hoses, pressure test) and fire damper.: Load-test the battery with a dedicated battery tester and compare the CCA reading against the manufacturer minimum specification. Measure exhaust back-pressure with a manometer at the test port and compare to the maximum allowable. Clean the radiator core with compressed air and pressure-test the cooling system to the cap rating. Verify the fire damper operates freely.
9. Complete the compliance inspection per NFPA 110 / AS 2941. Update the compliance certificate and log book. Record any defects, recommendations or parts replaced in the notes section. Set the next monthly test and annual service due dates and sign off.: Review the NFPA 110 and AS 2941 checklists to confirm every compliance item has been addressed. Update the compliance certificate with the service date, technician details and next due date. Record all test results, parts replaced and any recommendations for capital works in the notes section.

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