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Generator Maintenance Schedule: What to Check and When
A diesel generator is one of the most reliable machines on a site when it is maintained, and one of the most expensive when it is not. Most failures trace back to filters, oil, coolant or batteries that were left too long.
The schedule below is a general framework. Always follow the interval in the manual for your exact engine, and use running hours or elapsed time, whichever comes first.
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Daily or Before Each Run
- Engine oil and coolant level
- Fuel level and any visible leaks
- Battery terminals and charger status
- Control panel alarms and a clear area around the set
Weekly or Monthly
- Run a standby set for a short period under load
- Check belts, hoses and radiator fins
- Drain water from the fuel filter or water trap
- Check the air filter restriction indicator
At Each Planned Service
- Change engine oil and oil filter
- Replace fuel filters and service the air filter
- Test coolant strength and condition
- Test the battery and charger
- Run under load and record hours and readings
Yearly or Major Checks
- Load test the set, ideally on a load bank
- Inspect the alternator, wiring and control panel
- Check engine mounts and exhaust connections
- Review the full service log and plan any overhaul
Mistakes That Shorten Engine Life
- Running very light loads for long periods
- Using poor fuel or letting water collect in the tank
- Skipping services on a set that rarely runs
- Topping up with the wrong oil or coolant
Frequently Asked Questions
How often should a generator be serviced?
Follow the manual for your engine. Many sets are serviced by running hours at intervals the maker specifies, and also at least once a year.
Does a standby generator need servicing if it rarely runs?
Yes. Oil, fuel and batteries age even when the set is idle, so service it on time and run it under load periodically.
Generators in our store
Real listings with specs. Request a quote or make an offer.
NewCummins 1500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Container
UsedCummins 1500 kVA Diesel Generator (Used)
LagosInspection on request
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Condition
- Used
NewPerkins 500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Canopy
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