Free generator 500-hour service procedure
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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Updated 26 Oct 2026
Generator 500-Hour Service Procedure
Intermediate service - diesel generator (stationary and portable)
Fuel System
Air Intake
Cooling System
Drive / Belts
Alternator / Voltage Regulation
Electrical / Protection
Oil Analysis
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Short answer
A generator 500-hour service procedure records a diesel generator's intermediate service: the 250-hour tasks plus fuel and outer air filters, coolant concentration, fan belt, alternator brushes, transfer switch test, battery load test, protection relay checks and an oil sample. Typical manufacturer schedules set it every 500 engine hours. Regulation 213 of the model WHS Regulations requires maintenance by a competent person following the manufacturer's recommendations.
Checked against Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011) on by the MapTrack templates team. How we check templates
Key takeaways
- The MapTrack generator 500-hour service procedure contains 13 checks across 7 sections. Sections covered: Fuel System, Air Intake, Cooling System, Drive / Belts, Alternator / Voltage Regulation, Electrical / Protection, Oil Analysis.
- Model WHS reg 213 requires generator maintenance by a competent person following the manufacturer's recommendations; it does not itself require records.
- A generator running 24 hours a day reaches 500 hours in about 21 days.
- Test the automatic transfer switch through a full transfer and retransfer, and record the result.
- Take an oil sample at each 500-hour service so wear and contamination can be trended.
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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 plant under the WHS laws, so regulation 213 requires them to be maintained and inspected by a competent person following the manufacturer's recommendations, and AS/NZS 3010 covers how standby generators for essential services are installed. The 500-hour service record is the evidence of that maintenance 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.
- Email the right people when a form is submitted, with an automation you set up.
- File every completed form against the asset, location or person it covers.
- Download any completed form as a PDF, with failed answers listed at the top.
- Fill in forms offline; they upload when the device is back online.
- 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.
- Set who can view, fill in or edit forms with user roles.
- Upload a paper form (PDF, Word, Excel or a photo) and MapTrack's AI builds a digital version for you to check.
- Raise a work order from a submitted form with an automation you set up.
- 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, by date or meter reading. Each submission is stored as a timestamped PDF against the asset record.
Get the free templateEnter your email above to download the full generator 500-hour service procedure as a PDF.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 long daily hours, 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.
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Frequently asked questions
Applicable regulatory standards
This template is a starting point. Check the current requirements that apply to your equipment, work and location. The template alone does not establish compliance.
| Standard | Edition | Clauses this template relies on | Source |
|---|---|---|---|
| Model Work Health and Safety RegulationsRequires competent-person maintenance following the manufacturer's recommendations; it does not itself require service records. | Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011) |
| Safe Work Australia (drafted by the Parliamentary Counsel's Committee) |
| Electrical installations - Generating setsInstallation standard for generating sets, including those supplying safety and essential services. | AS/NZS 3010:2017 (incl. Amd 1:2020) |
| Standards Australia and Standards New ZealandSold by the publisher |
| Model Code of Practice: Managing risks of plant in the workplaceGuidance on maintenance and repair of plant following manufacturer instructions. | November 2024 version (reviewed May 2018; amended 2021, 2023 and 2024) |
| Safe Work Australia |
Model Work Health and Safety Regulations
Edition: Model WHS Regulations as at 5 December 2025 (cited within as the Work Health and Safety Regulations 2011)
Requires competent-person maintenance following the manufacturer's recommendations; it does not itself require service records.
- reg 213: Plant must be maintained, inspected and, if necessary, tested by a competent person, following manufacturer or competent person recommendations; annual inspection applies only if neither is practicable.
Safe Work Australia (drafted by the Parliamentary Counsel's Committee)
Electrical installations - Generating sets
Edition: AS/NZS 3010:2017 (incl. Amd 1:2020)
Installation standard for generating sets, including those supplying safety and essential services.
- 3.5: Additional requirements for permanently connected generating sets supplying safety and essential services
Standards Australia and Standards New ZealandSold by the publisher
Model Code of Practice: Managing risks of plant in the workplace
Edition: November 2024 version (reviewed May 2018; amended 2021, 2023 and 2024)
Guidance on maintenance and repair of plant following manufacturer instructions.
- Section 3.6: Maintenance, repair and cleaning of plant, following manufacturer instructions and by competent people.
Each source was read at its publisher and the page checked on 26 October 2026. The publisher's current text is the authority.
Generator 500-hour service procedure preview
The numbers behind this generator 500-hour service procedure
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<div style="max-width:480px;font-family:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;border:1px solid #E5E7EB;border-radius:12px;padding:20px;background:#ffffff;">
<p style="font-size:12px;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;color:#071D49;margin:0;">Free template</p>
<p style="font-size:18px;font-weight:700;color:#071D49;margin:6px 0 0;">Generator 500-hour service procedure</p>
<ul style="margin:12px 0 0;padding-left:18px;color:#374151;font-size:14px;line-height:1.6;">
<li style="margin:4px 0;">Fuel system: replace fuel filter element, check fuel tank for water and sediment.</li>
<li style="margin:4px 0;">Air intake: replace outer air filter element, clean and inspect air intake and exhaust louvres.</li>
<li style="margin:4px 0;">Cooling system: test coolant concentration with refractometer.</li>
<li style="margin:4px 0;">Drive / belts: replace fan belt (or inspect and retension).</li>
<li style="margin:4px 0;">Alternator / voltage regulation: check alternator brushes and slip rings, inspect voltage regulator.</li>
<li style="margin:4px 0;">Electrical / protection: test ATS operation, test battery under load (CCA), inspect wiring for heat damage, test all protection relays.</li>
</ul>
<p style="font-size:13px;color:#6B7280;margin:14px 0 0;padding-top:12px;border-top:1px solid #E5E7EB;">Free <a href="https://www.maptrack.com/templates/generator-500-hour-service" style="color:#071D49;font-weight:600;text-decoration:none;">Generator 500-hour service procedure</a> by MapTrack</p>
</div>Free to reuse, including commercially. This template is published under a Creative Commons Attribution 4.0 licence. Copy it, adapt it, put it on your own site or in your own docs. All we ask is that you credit MapTrack with a link back to this page. The snippet above already includes that credit, so if you use it as-is you’re covered.
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Writing about this topic? You’re welcome to quote this checklist. Here’s the wording to use so your readers can find the original.
The MapTrack generator 500-hour service procedure contains 13 checks across 7 sections.
- Short attribution
- MapTrack Generator 500-hour service procedure, https://www.maptrack.com/templates/generator-500-hour-service
- Reference list
- MapTrack. (2026). Generator 500-hour service procedure [Checklist template]. Retrieved from https://www.maptrack.com/templates/generator-500-hour-service
Free to reuse with credit under a Creative Commons Attribution 4.0 licence. If you’d rather link straight to it, the page is https://www.maptrack.com/templates/generator-500-hour-service.
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