A generator set typically comes into play during critical moments: power outages, peak workloads, or locations without access to the electrical grid. That’s precisely why preventative maintenance of generator sets is not optional ; it’s crucial for ensuring their reliability, safety, and performance. 

Whether you use it as an emergency system in an industrial facility or as support for your photovoltaic energy system, preventive maintenancenot only avoids unexpected breakdowns, but also extends the equipment’s lifespan, reduces costs, and improves its efficiency.

This article shares a practical checklist for preventive maintenance of generator sets,  which will help you keep your generator in perfect working order and avoid unexpected downtime. You can use it internally or as a basis for your maintenance plan with a specialized technical service.

Why is preventive maintenance of generator sets so important?

We already explained in a previous post why generator maintenance is necessary. Here are some notes; if you’re interested in more information, please follow this link .

Proper maintenance allows:

• Avoiding failures in emergency situations
• Reduce costs due to serious breakdowns
• Extend the useful life of the equipment
• Ensure optimal performance
• Comply with safety regulations

Why is it critical if you have photovoltaics or aerothermal energy?

If your system is hybrid, the generator is your “safety net.” A maintenance failure could leave you without heating (air source heat pump) or without electricity on days with low solar radiation. System integration requires that every component is in perfect working order. Preventive maintenance of generators is especially crucial in these cases.

Pro tip for preventative generator maintenance: Automate your maintenance. A generator that hasn’t been started for months is likely to fail due to fuel degradation, faulty fuel delivery components, or battery discharge.

How often should preventive maintenance be performed on generator sets ?

The recommended frequency of preventive maintenance for generator sets depends on the type of generator set, the environment (dust, temperature, humidity, etc.), the criticality of its use, but mainly on the frequency of its use and the hours of operation.

• Occasional use: Preventative maintenance is recommended every 6 to 12 months at most, or every 400 to 500 hours of use at most. ( This applies to 1500 rpm groups. For 3000 rpm groups, it will be every 100 to 150 hours at most .)
• Regular usage time: preventive maintenance is recommended every 6 months or every 400 hours of use (maximum).
• Intensive usage time: every month or every 400 hours of use.

Who is responsible for performing preventive maintenance on generator sets?

Preventive maintenance of generator sets is a shared responsibility:

• The user performs basic checks and detects anomalies.
• GenPower ‘s specialized technician handles critical tasks and professional maintenance.

As a general rule, the user can handle basic visual inspections, test starts, and level checks, but in the event of any breakdown, abnormal symptoms, or maintenance involving disassembly, adjustments, or electrical work, it is advisable to use a specialized technical service to ensure safety and reliability.

This combination provides efficiency and maximum lifespan for your generator set.

At GenPower we offer scheduled maintenance plans tailored to each type of installation and use, so you don’t have to worry about just adding fuel.

Tasks that the user can perform

These are basic and safe checks that help detect problems early.

General checks

• Visually check the condition of the equipment.
• Check for leaks of oil, fuel, or coolant.
• Verify that the group is clean and well ventilated.
• Hearing unusual noises or vibrations.

Engine and fluids

• Check the oil level
• Check the fuel level
• Check the coolant level

(Without manipulating internal components or making adjustments)

Start-up and basic operation

• Start the group to check that it is working correctly.
• Verify that the startup is fast and stable.
• Check that no alarms appear on the control panel
• Check that the vibration is correct.

Basic cleaning

• Exterior cleaning of the generator set
• Remove dust, dirt, or obstacles around the equipment
• Keep ventilation grilles clear

Tasks that a Gen Power technician must perform

These preventive maintenance tasks for generator sets require technical knowledge, specific tools, and regulatory compliance.

Mechanical maintenance

• Oil and filter change
• Fuel system inspection
• Adjustment of straps, sleeves and screws
• Cooling system inspection
• Diagnosis of internal vibrations or noises

Electrical maintenance

• Alternator check
• Voltage, frequency and stability check
• Electrical insulation check
• Verification of electrical protections and panels
• Load tests.

Control and security

• Control panel review
• Checking sensors and alarms
• Verification of emergency stop systems
• Updating and adjusting parameters
• Issuance of technical report

When to contact your technical service while performing your preventive maintenance tasks

Contact your technical support immediately if you detect any of these signs:

• The group either doesn’t start or stops on its own.
• Alarms or error codes appear
• Loud noises, knocks, or abnormal vibrations
• Power loss or electrical instability. Voltage drops or unstable frequency, frequent protection tripping, or difficulty handling the usual load.
• Burnt smell, signs of overheating or blackening of cables and terminals, or excessive or abnormally colored smoke (blue, persistent white or very dense black), especially if they appear suddenly.
• The group hasn’t been checked in a long time.
• Any repair that requires disassembling internal parts of the engine (cylinder head, injectors, injection pump) or the alternator.

Entrust the preventive maintenance of generator sets  to professionals

Professional preventive maintenance guarantees: safety, legal compliance, greater efficiency and operational peace of mind.

At Gen Power we advise you to define the most suitable maintenance plan for your generator set and its specific use.

Ideally, depending on the situation of your installation and your circumstances, a plan should be made with times and responsible parties (user tasks and technical team tasks) and with a record of the tasks performed and the circumstances that are observed.

Conclusion

The checklist above will serve as a practical guide to understanding what needs to be checked on a generator set and why preventive maintenance is so important. However, many of these tasks require technical training, measuring equipment, and specific safety protocols.

That’s why it’s advisable to have a preventative maintenance plan carried out by generator set specialists, who can guarantee that your installation is always ready to come online when the grid fails. Furthermore, a good maintenance program can be integrated with other energy solutions at your facility, such as photovoltaic systems or heat pumps, ensuring a comprehensive strategy for continuity of supply.

Since 1962, Soma Gen Power has been building, installing, and repairing generator sets   in Lleida and Huesca for any application. We not only install cutting-edge aerothermal and photovoltaic technology; we ensure your backup power equipment is virtually indestructible.

If it’s been more than a year since you last checked your generator, it’s time to take action before the next storm or peak demand hits.

Get in touch with us and we will study your needs and provide you with a customized proposal for the preventive maintenance of generator sets .