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How often should generators be serviced?

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How often a generator needs to be serviced depends on several factors, such as how often it’s used, the environment it’s in, and the type of generator it is.

If you use your generator regularly, you should have it serviced more often. This is because frequent use means it is more likely to experience wear and tear and need repairs.

No matter the generator size, all require generator maintenance. As part of a preventative maintenance program, servicing will check elements are working to peak performance, such as the fuel system and fuel filters, oil filters, and control panel.

Throughout this blog we’ll look into which generators require servicing, how often you should expect to do it, and why it’s important.

Why is it important to service your generator?

Servicing your generator is important because it helps to keep the generator in good working condition. A well-maintained generator is more likely to start and run smoothly when you need it, and it’s also less likely to break down, especially important if it’s a backup generator.

Regular servicing can also help to extend the life of your generator. By ensuring that the generator is running efficiently, you can avoid potential problems that could cause damage or require expensive repairs.

Servicing your generator can help to improve its performance. Regular maintenance can ensure that the engine is running smoothly and that all the parts are clean and functioning properly.

This can help to make sure your generator is able to provide power when you need it.

Remembering to service your generator regularly will help to ensure it’s always ready to power your home or business in the event of a power outage.

When do I need to get it serviced?

As with any mechanical device, it is important to keep your generator well-maintained in order to ensure its longevity and continued operation.

Depending on the make and model of your generator, the frequency of maintenance may vary, but a rough guide is to get it serviced every 6-12 months or every 500 hours of operation, whichever comes first.

A portable generator needs a spark plug change every 100-150 hours!

This will help to ensure that all the parts are in good working order and that there is no build-up of dirt or debris.

However, if you live in an area with a lot of severe weather conditions, then you may need to increase the frequency of your generator’s maintenance.

How do I know when a generator needs servicing?

Generators are vital pieces of equipment, providing backup power in the event of an outage. But like any machinery, they require regular maintenance to keep them in working condition.

So how do you know when your generator needs servicing?

For most diesel generators, it’s important to check the oil level regularly and change the oil every 500 hours of operation.

The air filter should also be checked monthly and replaced as needed. In addition, diesel generators should undergo a major service every 2000 hours of operation, which includes changing the fuel filter and coolant.

Portable generators are slightly different, as the oil does not need to be changed as frequently. However, the air filter should still be checked monthly and replaced as needed.

In addition, portable generators should have their spark plugs replaced every 100 hours of use, and should be given a full service every 1000 hours of use, which includes checking all the major components and making sure everything is in good working order.

Standby generators are similar to diesel generators in terms of maintenance, although they generally don’t need to be serviced as often.

For example, the oil only needs to be changed every 1000 hours of use, and the air filter only needs to be checked every six months.

What happens if I don’t service my generator?

Most people rely on generators to provide a backup power source in case of an emergency. However, if you don’t regularly service your generator, it may not work when you need it most.

Our engineers can help you to keep your generator in good working condition. They will run a detailed inspection on all of the components and identify any potential problems.

In addition, they can perform routine maintenance, such as changing the oil and air filters, testing the battery, and ensuring the fuel supply and coolant levels are correct.

This will help to make sure your generator is always ready to power up and supply electricity when needed. Regular servicing is the best way to keep your generator running smoothly and prevent expensive repairs.

Most come with a maintenance guidance manual, it’s worth following as it’s more cost effective to maintain than to have to buy a new generator.


Is it different to service a diesel generator to a petrol one?

When it comes to choosing a generator, there are a few things to consider. One is cost – a diesel generator tends to be more expensive than a petrol generator, but they may be more cost effective in the long run.

Another is engine size – petrol engines tend to be smaller, making them more portable. Finally, there’s running time – a diesel generator can run for longer periods of time without needing to refuel.

All of these factors should be considered when choosing the right generator. However, when it comes to servicing a generator, there is little difference between a petrol and diesel generator.

Both types of generator need to have their oil changed regularly, and both types may require occasional tune-ups.

So, when it comes to servicing, there is no need to worry about whether you have a petrol or diesel generator – the process is the same for both.
The type of generator does affect how often it should be serviced.

A portable generator usually doesn’t need servicing as often as a standby generator, a standby generator should be tested weekly and a service done as needed.

Diesel generators require servicing at least once a year by a qualified technician. Backup generators should be tested monthly and the service done as needed.

How long does it take to service a generator?

Generator servicing is important to keep the generator in optimum condition and ready to use when needed.

Generator maintenance typically includes an oil and filter change, air filter replacement, spark plug replacement, and greasing of moving parts.
If only a visual inspection is required then it shouldn’t take more than 1 hour. A more detailed inspection may take 2-4 hours, depending on the size of the generator.

The engine must be running during the generator service in order for the technician to properly inspect it.

It may be worth having a maintenance kit handy, especially if you’re relying on it to provide emergency power, so you can keep the engine running and the generator ready until it’s next service.


Generator servicing should be a part of your preventative maintenance plan to ensure your generator is always up and running when you need it most.

Solent Power can help with that. We offer comprehensive generator service plans to keep your equipment in good condition, so you can rest assured knowing that you’re prepared for whatever comes your way.

Contact us today to learn more about our services and how we can help you maintain peace of mind during power failure and provide backup power when needed.

Paul Phelps Solar Power Owner
Paul Phelps
Paul is the MD of Solent Power and specialises in emergency power solutions, helping to protect your facilities from power loss. Get in touch with us today to discuss the different power brands that we can offer and how they can suit your needs.
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