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Solution to the Unstable Speed of Cummins Diesel Generator Set

Nov. 17, 2023

If the speed of the Cummins diesel generator set is unstable, the first thing to observe is whether there is any leakage at the interfaces 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 air from the low-pressure oil circuit.


Cummins 600 kw diesel generator


If there is no air inside the low-pressure oil circuit, the inlet filter screen of the fuel transfer pump should be removed for inspection. If the oil inlet filter screen of the fuel transfer pump is not blocked, the diesel filter or oil tank inlet pipe should be checked for blockage, air leakage, etc. If the unstable speed still occurs, the following checks and adjustments should be carried out in sequence based on actual usage:


1. Check if the connecting parts are loose, if the pipes are broken, and if the filters are not tightened, and correct them one by one; Check for wear, replace and adjust the transmission rod.


2. Reassemble and adjust the idle spring, readjust the speed limiter centrifugal hammer, and readjust the fuel pump.


3. Replace fuel, replace all filters, and install a fuel heater; Replace or clean the actuator.


4. Loosen the bleed screw of the high-pressure oil pump, press the hand oil pump, remove air from the oil circuit, and tighten the return screws of the high and low pressure oil pipes of the diesel engine.


During the inspection, it was not found that the speed of the Cummins diesel generator set was unstable and there was blockage in the fuel system. When there was no air in the oil circuit, the fuel injection pump governor should be removed and sent to the pump calibration center for repair. When adjusting the oil pump and fuel injector, the maintenance personnel should be informed of the condition of the equipment as much as possible to avoid necessary disassembly work.


From the above content, it can be seen that there are many reasons for the unstable speed of Cummins diesel generator sets. To solve this problem, in addition to following the text in order, it is also necessary to use and maintain Cummins diesel generator sets correctly in daily work. There are many examples to prove the correct use method and daily maintenance, It can effectively avoid faults and extend the service life of Cummins diesel generator sets due to unstable speed for many years.


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