Five things to know before buying a used diesel generator


There are a lot of reasons why you should buy a low-hour, pre-claim diesel generator. Buying used generators for sale is probably the most financially savvy approach, considering their price. However, to purchase a high-quality and reliable unit, you need to consider various features, such as usage, age, hours, history, maintenance, and so on.

In this article, we will discuss a couple of these features and help you make the best decision.

Usage, hours, and age

When looking for a used diesel generator, one of the first things you should pay attention to is usage, hours, age. Therefore, before getting used diesel generator, you need to ask about the unit’s age and history. While age represents who old the generator is, the history covers how the previous owner used it.

Make sure to check how many hours the machine has on it and ask whether it has been used as a primary or secondary unit. For instance, a generator that’s a couple of months old has a few hours on it, and it will serve you well.


Manufacturer reputation

One of the main reasons people buy diesel generators is to ensure their business keeps going in case of a power outage. That’s why when choosing this type of unit, you should go for reputable brands. They don’t only provide durability, but you can easily get spare parts everywhere.

Tear & wear

Like any other mechanical gadget, generators endure tear and wear due to their activity. Therefore, it’s crucial to conduct a visual inspection to ensure that all mechanical parts are in good condition. In addition to checking cracks and corrosion on various parts, you should get bushings and bearings replaced, regardless of their function and condition.

Take some time to check wire insulations, electrical parts, and welds. Last but not least, run load tests to establish the electrical power output of the unit and efficiency. Be aware that your decision should be partly based on the load test results.


Even though you may not be in a position to verify maintenance data, you should request the seller to provide data on keeping up with repairs on the diesel engine. Make sure to check whether regular repairs covered generator closes, power units, and exchange switches.

Also, it would be good if the seller could provide you with the support you may require. This includes having circuit testers, dyno-testing gear, and in-house experts.

Know who are you buying from

Today, almost anyone can sell a diesel generator. But you should know that diesel generator is a complex piece of equipment that demands professional testing and proper maintenance to perform optimally.

If you want your investment to pay off, you should work with a professional and knowledgeable dealer. Depending on size and features, a diesel generator is an expensive machine, so you should avoid being in a rush when purchasing this type of unit. Do your research and ask the dealer any questions you may have.