Free generator 250-hour service procedure
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Free generator 250-hour service checklist (PDF-ready). Engine oil, filters, load bank testing, exhaust, electrical and enclosure checks. Download free.
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See the first part of the generator 250-hour service procedure below. Download the full version above.
What is a generator 250-hour service procedure?
A 250-hour service is the first tier of scheduled preventive maintenance for a diesel generator. It is performed every 250 engine hours and is classified as a minor service. The procedure covers engine oil and filter replacement, air filter inspection, fuel system maintenance, coolant checks, load bank testing at multiple load steps, exhaust system inspection, battery and electrical checks, emergency stop testing and enclosure condition assessment. Unlike a daily or weekly visual check, the 250-hour service involves actual maintenance actions: draining and replacing fluids, replacing filters, running performance tests and verifying control panel operation. It is typically performed by a qualified generator technician or electrician.
The 250-hour service is the first line of defence in generator reliability. Generators that sit idle between outages accumulate moisture, fuel degrades and batteries lose charge, so regular servicing is essential even when the engine hours accumulate slowly. In Australia, generators used as standby power for essential services are subject to AS/NZS 3010, and all generators on construction sites must comply with WHS Regulations 2011. The 250-hour service provides documented evidence that the generator is being maintained to manufacturer specifications.
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Benefits of using this generator 250-hour service procedure
- Reliable power when needed: regular oil, filter and coolant maintenance ensures the generator starts and runs at full capacity during power outages or peak demand.
- Prevents wet stacking: load bank testing at each service burns off carbon and fuel residue that accumulates when generators run at light load.
- Extended component life: clean oil and correct coolant concentration reduce wear on engine, alternator and cooling system components.
- Lower repair costs: a 250-hour service costs a fraction of an emergency breakdown repair. Catching issues early prevents cascading damage.
- Compliance: documented service records demonstrate that generators are maintained to Australian Standards and WHS requirements, supporting insurance and regulatory obligations.
- Resale value: a complete service history with documented 250, 500 and 1,000-hour services increases the generator's value at resale.
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 250-hour service procedure
This generator 250-hour service procedure covers 6 key areas:
- Engine: drain and replace engine oil (15W-40), replace oil filter, inspect air filter, drain fuel/water separator, check coolant level and concentration, inspect radiator and hoses, inspect fan belt tension and condition.
- Exhaust system: check exhaust for smoke and leaks, inspect exhaust flex couplings.
- Electrical: check battery terminals, voltage and electrolyte, check control panel operation and alarms, test emergency stop, check earth connections.
- Load testing: run load bank test at 25%, 50%, 75% and 100% rated load.
- Mechanical: check vibration isolation mounts, inspect fuel lines and connections.
- Enclosure / canopy: inspect vents, louvres and latches.
How to use this generator 250-hour service procedure
- Shut down the generator and allow the engine to cool. Isolate the generator from the electrical supply. Ensure the area is well ventilated.: Switch the generator to off mode and open the main circuit breaker. Isolate from the electrical supply using the designated isolation point. Allow at least 15 minutes for the engine to cool. Ensure the service area has adequate ventilation for exhaust fumes during load testing.
- Record the equipment details and current hour meter reading at the top of the service procedure form.: Capture the generator serial number, fleet ID, make, model, rated output (kVA/kW), fuel type, site location and controller type. Cross-check the hour meter reading against the last service to confirm the 250-hour interval.
- Start with the engine section: drain the old engine oil, replace the oil filter, fill with new oil to the correct level, then inspect the air filter, drain the fuel/water separator and check coolant level and concentration.: Use 15W-40 CI-4 or CK-4 engine oil as specified by the manufacturer, typically 8 to 20 litres depending on generator size. Pre-fill the new oil filter before fitting. Inspect the air filter for damage and clean with compressed air if reusable. Drain the fuel/water separator and check coolant concentration with a refractometer.
- Inspect the radiator and hoses for leaks or damage. Check fan belt tension and condition.: Inspect the radiator core for blocked fins, corrosion or impact damage. Check all hoses for swelling, cracking or softness, paying attention to the upper and lower radiator hoses and heater hoses. Measure fan belt deflection against the manufacturer specification, typically 10 to 15 mm at the midpoint.
- Check battery terminals, voltage and electrolyte level. Check the control panel operation, alarms and earth connections. Test the emergency stop.: Battery voltage should read 12.4V or above for a fully charged battery. Clean terminals with a wire brush if corroded. Check the control panel for correct operation of all indicators and alarms. Verify the earth connection is secure and corrosion-free. Test the emergency stop from all accessible locations.
- Start the generator and run the load bank test at 25%, 50%, 75% and 100% rated load. Record voltage, frequency and temperature readings at each step.: Connect the load bank and apply load in steps, holding each level for at least 5 minutes. Record output voltage (should be within 2% of rated), frequency (should be 50 Hz plus or minus 0.5 Hz) and coolant temperature at each load step. The 100% load step confirms the generator can deliver its full rated output.
- While running, check the exhaust for smoke and leaks. Inspect exhaust flex couplings. Check vibration isolation mounts.: Black smoke indicates overloading or poor combustion. Blue smoke indicates oil burning. White smoke on startup is normal in cool conditions but should clear within minutes. Inspect exhaust flex couplings for cracks or leaks. Check vibration mounts for cracking, sagging or detachment.
- Inspect fuel lines and connections. Inspect the enclosure or canopy, including vents, louvres and latches.: Check all fuel lines for chafing, cracking or weeping connections. Inspect the enclosure for damage, ensure all vents and louvres are clear of obstruction and open freely, and verify all latches and locks are functional.
- Record any defects or recommendations in the notes section. Set the next service due hours (next 250-hour and next 500-hour intervals). Sign off and update the generator's maintenance log.: Classify defects as critical, major or minor. Calculate the next 250-hour and 500-hour service points from the current meter reading. Update the generator service sticker and fleet management system. Capture the technician name, qualification and date.
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 250-hour service should be performed every 250 engine hours. For site generators running continuously, this interval may arrive every 2 to 4 weeks. For standby generators with low running hours, schedule a calendar-based service at least every 6 months to prevent fuel degradation and battery discharge, even if the hour meter has not reached 250. In MapTrack, set up dual triggers (hours and calendar) to ensure no generator is missed.
For generators that accumulate hours slowly (such as standby units that only run during outages), a time-based service interval of every 6 months should be used as a backstop, because fluids and filters degrade over time even without engine operation. In MapTrack, configure dual triggers (hours and calendar) so the service work order is raised when either threshold is reached first.
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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