What to look for when buying a used generator

28 January, 2025

Purchasing a used generator is an excellent option to save money and reduce environmental impact.
 

However, before choosing a generator, it's crucial to consider several important factors to ensure its proper functioning and maximize its efficiency.
 

In this article, we will also explain step by step how to inspect a used generator regularly.

What to know before buying a used generator

Generator history

It's essential to know the generator's history, such as operating hours, maintenance performed, and whether it has had any major repairs. A detailed history will provide more confidence when purchasing the used generator.

Compatibility

The generator must be suitable for the type of load and energy needs required. Check the model, manufacturing year, and any technical specifications that could influence its performance and capacity to power different equipment or facilities.
 

Warranty

It's always advisable to have a warranty from the seller. This shows the generator’s quality and will cover any unforeseen issues or problems that may arise after purchase.
 

Power and Operating Conditions

The required power for specific tasks and the environment in which it will operate (indoor, outdoor, areas with emission restrictions, etc.) will influence the choice of one generator over another.

Checklist for inspecting a used generator

Creating a checklist to inspect the used generator will ensure it operates correctly and maximize its efficiency and safety.
 

For example, technicians should inspect the generator to check the ignition system, fuel system condition, leaks, oil levels, cooling system, and more. Each inspection point is marked on a document or digital form with necessary comments. If any component needs repair or is worn out, it should be fixed to avoid potential failures and prevent risks.

Below is an example of a checklist for inspecting a used generator:

Step-by-step guide to inspecting used generators

But what is the process for inspecting a used generator?
 

To ensure the proper operation of the generator, it's necessary to check the condition of key components such as the fuel system, radiator, belts, and other essential parts.
 

At the slightest sign of failure, it will be important to perform preventive maintenance to avoid bigger issues that could affect its operation.
 

What is preventive maintenance based on?

1. Regular inspections

Perform periodic visual inspections to check the condition of the housing, terminals, cables, fans, filters, and other external components. This will help detect leaks, corrosion damage, or wear on cables and other parts.
 

2. Cleaning the generator

Keeping the generator clean from dust, grease, rust, or debris is essential to prevent premature wear or overheating.
It’s necessary to use appropriate equipment to avoid damage or moisture entering the generator's interior.

3. Lubricating the Generator’s Components

Proper lubrication of the generator's moving parts should be done according to the manufacturer's recommendations regarding lubricant type, amount, frequency, and application method. Excessive or improper lubrication can cause friction, wear, or overheating of the components.
 

4. Periodic Vibration and Noise Tests

Conduct periodic vibration and noise tests on the generator using specialized equipment that can detect imbalances, looseness, misalignments, or internal rubbing.
These tests should be done both with the generator running and at rest, comparing the results with reference values.

How to obtain used generators with guarantees?

Before purchasing a used generator, it’s crucial to know if it comes with a warranty, as this provides security and backup in case of any faults or defects. 

Additionally, it’s important to check the duration of the warranty. This protection will ensure a safe purchase and investment.
Knowing the company that supplies the used generator is vital to guarantee the product's reliability and quality.

Should used generators be inspected regularly?

The answer varies depending on the type of generator and its usage.
Periodic inspections of generators help ensure their efficiency, maintain them in good condition, and extend their lifespan.
 

Each generator has manufacturer recommendations for its care and maintenance. It will be important to establish a maintenance schedule to ensure inspections are carried out. Following inspections and safety protocols will ensure efficient operation and reduce operational costs.

Tips for identifying if a used generator is not functioning properly

How can you tell if a generator is in poor condition?
To ensure good performance, it’s necessary to check the condition of essential components of the generator, such as filters, fuel system, belts, etc.
 

Strange Odor

If the generator emits a strange smell, it could indicate that some fluid is burning or there is a leak. It might also be a sign that certain parts need to be replaced.
 

Constant Noises

Strange noises, such as knocking or abnormal buzzing, could be indicative of internal problems in the generator, such as wear or failure in the components.
 

Fuel or Oil Levels

If fuel or oil levels are low, it could be due to a leak that might worsen if not diagnosed and repaired promptly.
 

At the first sign of a problem, it will be essential to perform preventive maintenance to avoid major damage that could affect the generator's performance.
 

At CYCLICA, we offer a wide range of used generators that stand out for their efficiency, durability, and consistent performance. Check out our catalog now.