Free generator 500-hour service procedure
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Free generator 500-hour service checklist (PDF-ready). Fuel filter, air filter, ATS testing, protection relays and alternator checks. Download free.
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See the first part of the generator 500-hour service procedure below. Download the full version above.
What is a generator 500-hour service procedure?
A 500-hour service is the second tier of scheduled preventive maintenance for a diesel generator. It is performed every 500 engine hours and is classified as an intermediate service. It includes all tasks from the 250-hour service plus additional fuel system, air intake, cooling, alternator, electrical protection and oil analysis tasks. The 500-hour service adds fuel filter and outer air filter replacement, coolant concentration testing, fan belt replacement, alternator brush and voltage regulator inspection, ATS testing, battery load testing, wiring inspection, protection relay testing and engine oil sampling. It is typically performed by a qualified generator technician or electrician.
The 500-hour service addresses components that operate beyond the capability of the basic 250-hour checks. Fuel system maintenance is critical at this interval because diesel fuel degrades over time, forming wax, sludge and microbial growth that can block injectors and starve the engine during an emergency start. In Australia, generators are subject to WHS Regulations 2011, and standby generators for essential services must comply with AS/NZS 3010. The 500-hour service record forms part of the compliance documentation required for regulatory inspections and insurance renewals.
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Benefits of using this generator 500-hour service procedure
- Reliable power when needed: fuel filter and air filter replacement ensures clean fuel and air supply, preventing starting failures and power loss under load.
- Early fault detection: oil sampling, protection relay testing and wiring inspection identify developing problems before they cause unplanned outages.
- ATS confidence: testing the automatic transfer switch verifies the generator will start and take load automatically during a real power outage.
- Extended component life: fan belt replacement, alternator brush checks and coolant concentration testing prevent premature wear on critical components.
- Compliance: documented service records demonstrate that generators are maintained to Australian Standards and WHS requirements.
- Lower total cost: regular intermediate servicing is far cheaper than emergency callouts or major rebuilds caused by deferred maintenance.
Benefits of digitising forms in MapTrack
When you digitise generator service procedures in MapTrack, you get:
- Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
- Automatically get alerts when faults are identified.
- Link every form digitally as a PDF to the relevant asset, location or person.
- Receive a digital PDF copy with every submission to your email.
- Ability to share forms digitally.
- Build conditional logic (show or hide questions based on answers).
- Take pictures or attach photos. Not possible with a paper-based form.
- Electronic signatures.
- Edit forms later without reprinting.
- Restrict permissions (who can view, complete or approve).
- Build forms with AI (describe what you need and MapTrack suggests the form).
- Trigger work orders automatically when a fault is logged during an inspection.
- Track service intervals by hours, kilometres or calendar date in one place.
- Attach supplier invoices and parts receipts to each maintenance record.
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What to include in a generator 500-hour service procedure
This generator 500-hour service procedure covers 7 key areas:
- Fuel system: replace fuel filter element, check fuel tank for water and sediment.
- Air intake: replace outer air filter element, clean and inspect air intake and exhaust louvres.
- Cooling system: test coolant concentration with refractometer.
- Drive / belts: replace fan belt (or inspect and retension).
- Alternator / voltage regulation: check alternator brushes and slip rings, inspect voltage regulator.
- Electrical / protection: test ATS operation, test battery under load (CCA), inspect wiring for heat damage, test all protection relays.
- Oil analysis: take engine oil sample for laboratory analysis.
How to use this generator 500-hour service procedure
- Complete the full 250-hour service procedure first (engine oil, filter, air filter inspection, fuel/water separator, coolant, load bank test, exhaust, electrical and enclosure checks).: Verify all 250-hour items are completed and documented before starting the 500-hour specific tasks. The cumulative service model requires all lower-tier items to be done first.
- Replace the fuel filter element. Check the fuel tank for water and sediment at the drain point.: Prime the fuel system after fitting the new filter to avoid air locks during start-up. Open the fuel tank drain valve and draw off a small sample. Check for water (clear layer beneath fuel) or sediment. Record the fuel condition on the service form.
- Replace the outer air filter element. Clean and inspect air intake and exhaust louvres.: Inspect the air filter housing seal before fitting the new element. Remove debris from air intake and exhaust louvres using compressed air. Ensure louvres open and close freely if motorised.
- Test coolant concentration with a refractometer. Adjust if outside the 45-55% range.: Draw a coolant sample from the radiator or expansion tank. A concentration of 50% ethylene glycol provides freeze protection to minus 36 degrees Celsius and boil protection to 129 degrees Celsius. Adjust by adding concentrate or deionised water as required.
- Inspect and replace the fan belt if it shows cracking, glazing or excessive wear. Retension if the belt is still serviceable.: Inspect the belt surface for longitudinal cracking, glazing, fraying or material loss. Replace if any defects are found. If the belt is serviceable, measure and adjust tension to the manufacturer specification, typically 10 to 15 mm deflection at the midpoint between pulleys.
- Check alternator brushes and slip rings for wear. Inspect the voltage regulator for correct output.: Measure brush length and compare to the manufacturer minimum. Inspect slip ring surfaces for scoring, grooving or discolouration. Check the voltage regulator output by measuring terminal voltage at rated speed, which should be within 2% of the rated voltage.
- Test the automatic transfer switch (ATS) by simulating a mains failure. Verify start signal, load transfer and retransfer.: Simulate a mains failure by opening the mains supply breaker. Verify the ATS sends a start signal, the generator starts and reaches rated voltage and frequency, and the ATS transfers the load. Restore mains power and verify the ATS retransfers the load and the generator returns to standby.
- Load test the battery using a CCA tester. Inspect all wiring and connections for signs of heat damage or loose terminals.: Use a digital battery tester to measure cold cranking amps and compare to the battery rating. A reading below 75% of rated CCA warrants replacement. Inspect all wiring looms for chafing, heat damage, melted insulation or loose terminals. Tighten all connections.
- Test all protection relays: over-current, under-voltage and over-speed. Record trip settings and actual trip points.: Use a relay test set or the controller built-in test function to verify each protection relay trips at the correct set point. Record the set point and actual trip value for over-current, under-voltage and over-speed relays. Adjust if outside the manufacturer specification.
- Take an engine oil sample before draining (or from the drain stream). Label with date, hours and machine ID. Send for laboratory analysis.: Collect the sample in a clean bottle from the drain stream or a dedicated sample port while the oil is warm. Label with the generator fleet ID, date, hours and sample location. Send to an accredited laboratory for viscosity, water content, soot level and wear metal analysis.
- Record any defects or recommendations in the notes section. Set the next service due hours. Sign off and update the generator's maintenance log.: Classify defects as critical, major or minor. Calculate the next 250-hour, 500-hour and 1,000-hour service points from the current meter reading. Update the generator service sticker and fleet management system. Sign off with technician name and qualification.
In MapTrack, you can schedule and track maintenance digitally. Each submission is stored as a timestamped PDF against the asset record.
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Back to download formHow often should you complete this service procedure?
A 500-hour service should be performed every 500 engine hours. For site generators running continuously, this interval may arrive every 4 to 8 weeks. The service carries forward all 250-hour tasks. For standby generators with low running hours, the annual calendar-based service typically triggers before the 500-hour mark. In MapTrack, set up meter-based maintenance triggers so work orders are generated automatically as each generator approaches its next service point.
For prime power generators running continuously, the 500-hour interval may arrive every 3 to 4 weeks. In these applications, fuel quality management is critical, and the 500-hour fuel filter change should be paired with a fuel sample for laboratory analysis. In MapTrack, meter-based triggers ensure every generator in the fleet reaches its 500-hour service window on time.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS/NZS 3010 (Generating Sets)
- AS 2790 (Transportable Generating Sets)
- WHS Act 2011
- WHS Regulations 2011
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