Points to be Considered when Buying Used Generators

Buying a used, under-used generator offers many advantages. The most cost-effective way of obtaining a high quality generator is to buy used generators; therefore, the companies have a second-hand sales unit. However, there are many things that should be considered before making the purchase, which is the main objective of this article: The first point is to select the generator that will meet your specific power requirements. For more detailed information, please refer to our article on determining the size of the generator. Once you’ve determined the power you need, it’s time to examine other factors. Some key points when buying a used generator (diesel, natural gas, electric propane, gas, etc.) include:

  • Age, Working hours and Method of use
  • Producer history and reputation
  • Maintenance
  • Physical wear and tear
  • Performance on load test
  • Purchase (broker or distributor)

Generator Age, Working hours and Usage:

When purchasing a reliable second-hand generator, the first thing to note; The time clock, age and history of the generator set. First, check the time clock. It may also be helpful to know for what purpose (prime/standby) the generator was used for. Generator used as standby or backup energy source; It is better maintained and less worn than the generator used as prime or continuous energy source. However, do not forget the age and usage information of the device. Resellers may not have a detailed knowledge of the generators that they obtained from auctions or foreclosures in terms of origin, and purpose. In such cases, the seller’s reputation and technical expertise is important.

Producer History and Reputation:

Although the brand and model are not always critical, the generator manufacturer’s history and reputation play an important role in the second-hand machine you choose. Do not rely on unrecognized brands because you will purchase a device you must trust in meeting your electricity (prime or standby) requirements. By obtaining a quality device by choosing a reliable manufacturer, you also take the advantage of spare parts and warranty.


You may not be able to obtain detailed information on maintenance history of the generator; but you can control the knowledge of the company that you purchased about maintenance, diesel engine repair, power units and transfer panels. You can query the vendor’s current information by asking simple questions about the procedures they use.

Physical Wear and Wear:

  • Visual Inspection
    Your next step should be a visual inspection. A generator may contain wear during operation, such as any mechanical device. Check all mechanical components for wear or fault detection. Check the mechanical parts for any cracks or corrosion. If any suspicious parts are detected, they must be replaced by the parts recommended by the manufacturer.
  • Roller and Shaft Bearing Replacement
    If the dealer has not changed the rollers and shaft bearings, they must be replaced in all cases. The changeover prevents any damage caused by these parts while the generator is running. Roller and shaft bearings are under a high pressure while the generator is operating, and therefore it is very difficult to test these parts for any pressure they encounter while the generator is running. Therefore, in terms of safety, it is best to exchange these parts. The same applies for the bolts and studs.
  • Wiring and solder stability control
    Check the stability of the soldering parts. Also check the strength of electrical components and coils. Test the cable insulation for a fault.
  • Load test
    The load test is the most important standard test that the vendor should have done. A load test helps to determine the overall efficiency in the production of electrical energy. The good response of the generator to variable loads is generally an indication of the efficiency of the specified load limits. The type of electrical power generated by the generator indicates the general state of the generator set. The test should check the appropriate output and frequency. The test should be repeated three times to eliminate unexpected power failures.
  • Purchase (broker or dealer / distributor)
    Industrial diesel generators are complex, fine-tuned machines that need to be tested by certified technicians to work properly with optimum efficiency when you need them most. The reliability of the purchased company is important because of the high price of most diesel generators. Therefore, in order to eliminate the risks, companies that have gained a certain industrial experience by serving in this field for years should be preferred.
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