How to Maintain Your Generator for Longevity and Safety

Whether you’re using a generator as a backup power source or for daily operations, proper maintenance is the key to maximizing its performance, lifespan, and safety. Neglecting routine upkeep can lead to costly repairs, reduced efficiency, or complete failure when you need it most.

Quick Answer:

To maintain your generator, regularly check and change the oil, clean or replace air filters, inspect spark plugs (for petrol units), test the battery, and run the generator under load periodically. Scheduled maintenance every 50–200 hours of use helps prevent breakdowns and extends the unit’s life.

Why Generator Maintenance Is Essential

A well-maintained generator:

• Starts reliably during outages

• Operates efficiently with lower fuel costs

• Lasts significantly longer (up to 10,000+ hours for diesel units)

• Reduces safety risks like electrical faults or fuel leaks

Routine Generator Maintenance Checklist

1. Oil Changes

• Frequency: Every 50–100 hours (first change after 20–25 hours)

• Steps:

  • Drain used oil (when warm)

  • Replace with manufacturer-recommended oil

  • Change the oil filter if applicable

• Tip: Use high-quality synthetic oil for longer intervals

2. Air Filter Cleaning or Replacement

• Frequency: Inspect every 50 hours, replace every 200 hours

• Why It Matters: Dirty air filters reduce engine efficiency and increase fuel consumption

3. Spark Plug Inspection (for Petrol Generators)

• Frequency: Every 100 hours or annually

• What to Check: Wear, soot buildup, gap spacing

• Tip: Always use OEM-recommended spark plugs

4. Fuel System Care

• Petrol Generators:

  • Use fuel stabilizer for long-term storage

  • Drain old fuel after 30 days if unused

• Diesel Generators:

  • Check fuel filters for clogging

  • Bleed the fuel system if necessary

• Common Tip: Avoid storing fuel for too long – it degrades and may damage the engine

5. Battery Maintenance (for Electric Start Models)

• Check:

  • Battery charge level

  • Terminals for corrosion

• Test the battery every 3–6 months to ensure it holds a charge

Monthly Generator Maintenance Tasks

• Run the generator under load for 15–30 minutes

• Listen for unusual noises or vibrations

• Check voltage output using a multimeter

• Inspect fuel lines for leaks or cracks

• Clean exterior and remove dust or debris

Annual Generator Maintenance Tasks

• Replace oil and air filters

• Flush fuel system (if required)

• Full inspection of exhaust system

• Check transfer switch (for standby models)

• Schedule a professional inspection (recommended for large or commercial units)

Generator Maintenance by Usage Type

Common Generator Maintenance Mistakes to Avoid

• Using old or incorrect engine oil

• Forgetting to test the generator under load

• Storing fuel without stabilizer

• Ignoring warning lights or strange noises

• Overlooking air filter and spark plug replacements

• ⚠️ Remember: A poorly maintained generator may fail when you need it most — during an emergency.

Safety Tips for Generator Maintenance

• Disconnect the spark plug or battery before performing maintenance

• Never refuel a hot generator

• Store fuel in an approved, safe container

• Keep the generator outdoors or in a well-ventilated enclosure during use

• Use protective gloves and eye gear when handling oil or fuel

Signs Your Generator Needs Servicing

• Difficulty starting

• Unusual vibrations or noises

• High fuel consumption

• Smoke from the exhaust

• Low voltage output

If you experience any of these issues, stop using the generator and inspect it or consult a technician.

Frequently Asked Questions

How often should I service my generator?

It depends on usage, but as a general rule: every 50–100 hours for portable units, or every 6 months for standby units used infrequently.

Can I maintain my generator myself?

Yes, most basic tasks like oil changes, air filter replacements, and spark plug checks can be DIY. For complex diagnostics, consult a technician.

How long will a well-maintained generator last?

• Petrol: 1,000–2,000 hours

• Diesel: 5,000–10,000+ hours

Proper care dramatically extends generator lifespan.

Conclusion

Regular maintenance is the most important investment you can make in your generator’s longevity and reliability. Whether you own a small petrol unit or a large diesel standby generator, routine checks and upkeep will ensure it runs when you need it most — safely and efficiently.

Need maintenance supplies or looking for a low-maintenance generator?
Browse our full range of generators and accessories at Africa Power Equipment or contact our team for expert maintenance advice.