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Analysis of The Unstable Frequency of Cummins Generator Set

Dec. 23, 2021

The speed of Cummins generator set is unstable when it is working, which is manifested in the fluctuation of speed. This situation is more obvious at idling speed. In this article, Starlight Power Generation Equipment will give you a detailed introduction to the reasons and troubleshooting methods for the instability of the Cummins generator set as follows:


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1. The fuel system causes the frequency of the Cummins generator set to be unstable


(1) Failure analysis. When the Cummins generator set is in operation, if there is air, moisture, leakage in the fuel system, or the low-pressure oil circuit is blocked, it is easy to make the fuel supply intermittently or intermittently or the fuel supply is not smooth, resulting in unstable speed of the Cummins generator set.


(2) Troubleshooting methods. First, observe whether there is any leakage at each interface of the fuel system. If there is no leakage, loosen the bleed screw of the fuel injection pump and press the hand pump to remove the air in the low-pressure oil circuit. If there is no air in the low-pressure oil circuit, remove the oil inlet filter screen of the oil transfer pump for inspection. If the oil inlet filter screen of the oil transfer pump is not blocked, check whether the diesel filter or the oil tank inlet pipe is blocked or leaked.


2. The frequency of the Cummins generator set is unstable due to the failure of the governor


(1) Failure analysis. After the spring force of the speed regulating spring in the governor of Cummins generator set is weakened or the one-way thrust bearing is damaged, it is easy to cause the speed of the Cummins generator set to be unstable.


(2) Troubleshooting methods. As soon as the fuel injection pump governor assembly should be used for about 1000h, it should be calibrated on the fuel injection pump test bench. If the above-mentioned failure phenomenon occurs due to long-term failure to calibrate, as long as the fuel injection pump and governor assembly is sent to the pump calibration center for debugging, the failure of the Cummins generator set with unstable speed can be ruled out.


3. The failure of the fuel injection pump causes the unit frequency to be unstable


(1) Failure analysis. The unevenness of the oil supply of each cylinder of the fuel injection pump, the jamming of the internal plunger, the inflexible movement of the oil quantity adjustment rack, and the loosening of the fixing screws of the oil quantity control sleeve will all make the Cummins generator set unstable.


(2) Troubleshooting methods. After the fuel injection pump is damaged, the maintenance personnel generally do not disassemble the fuel injection pump components at will, but should send it to the school pump center for repair or calibration by professionals.


The above points are the analysis and troubleshooting methods of the unstable frequency of Cummins generator set compiled by Starlight Power Generation Equipment.  As a professional diesel generator manufacturer, we always insist on using first-class talents to build a first-class enterprise, create first-class products, create first-class services, and strive to build a first-class domestic enterprise. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.

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