How to Solve the Power Failure of Cummins Diesel Generator Set

Mar. 25, 2023

Cummins is the world's largest designer, manufacturer, and seller of diesel and compressed natural gas engines. Dingbo Power Cummins series generator sets have the advantages of robust and durable cylinder design, low vibration, low noise, forced water cooling, low heat radiator, excellent performance, long service life, easy maintenance, stable operation, and high efficiency. When using a diesel generator set, you need to understand relevant knowledge, such as what to do if the Cummins diesel generator set fails to generate power? There are many reasons why the generator does not have enough output voltage. When the generator generates electricity but the air switch is turned off, the genset does not have a voltage display, and the generator continues to generate electricity. This failure is usually caused by incorrect wiring. Below is an introduction to several common power problems of Cummins diesel generator set and solutions.


Reasons for operation failure of Cummins diesel generator set:

The output line of the Cummins diesel generator set is open.

The electrical equipment distribution box has failed.

The internal wiring of the generator air switch is incorrect or has poor connections.

How to Solve the Power Failure of Cummins Diesel Generator Set


How to solve the power failure of Cummins diesel generator set? Troubleshooting methods for Cummins diesel generator set:

Use the AC voltage block of a multimeter to test whether the generator has output voltage. No output voltage was found. This indicates that the fault is in the internal control box of the generator.


After the air switch in the generator control box of the Cummins diesel generator set was disconnected, the output voltage was measured and no abnormality was found when checking the air switch. When checking the connection between the three-phase output power of the generator and the air switch, it was found that the line was connected to the "off" position of the air switch, while the connection between the power supply and the power supply was connected to the "partition" position. After changing the connection of the air switch, the fault was resolved.


It was found that when the power of the diesel generator began to decrease, continuous oil pumping using a manual pump could continue to work. If you do not pump, after a few minutes of heavy operation, the speed will quickly decrease and shut down. Obviously, the insufficient power of this machine is due to insufficient oil supply in the low-pressure oil circuit. However, a careful inspection of the low pressure oil circuit system did not reveal any blockage and there was no air on the oil circuit. I feel that the resistance of the hand pump is high, and I suspect that the hand pump is blocked. However, the inspection of the hand pump did not find any problems. Comparing the oil flow of the manual pump with similar manual pumps of other equipment, it was found that the flow rate was relatively small.


The above is Dingbo Power's introduction to the cause analysis and troubleshooting methods for the power generation failure of Cummins diesel generator sets. We hope the above content can provide assistance to the diesel genset of users. Dingbo Power is an experienced manufacturer of diesel generator sets. Over the years, Dingbo Power has established close cooperative relationships with multiple companies such as Yuchai and Shangchai. Dingbo series diesel generator sets are supported by well-known domestic and foreign diesel engine brands such as Yuchai, Shangchai, Weichai, Jichai, Sweden Volvo, Cummins, and other well-known domestic and foreign diesel engine brands, providing mechanical engineering, chemical mines, factories, hotels, real estate, schools Hospitals and other enterprises and institutions provide safe, stable, and reliable electricity protection. If you would like to purchase diesel generators, please contact us via email



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