Low oil pressure is one of the common faults of the generator. Quick troubleshooting methods for troubleshooting help everyone solve problems in time. The following Xingbian Xiaobian teaches us how to accurately find the root cause of excessive oil pressure in the generator.
(1) Check the oil pressure display device
Use replacement method to check, that is to replace the good oil pressure gauge or sensor. If the oil pressure after the replacement is normal, the oil pressure display device is faulty. If the oil pressure display device is normal, the oil pressure is reduced, and the fault is in the lubrication part, judge according to the following method.
Judging from the oil temperature
If the oil temperature is too low, the oil pressure is low, and when the temperature rises, the oil pressure is normal, indicating that the oil is too thick and the oil passage is not smooth. If the original oil filter is clogged with impurities, the oil pressure will be reduced, but the oil pressure will be reduced. However, the oil pressure is still within the specified range. When the oil viscosity is too high, the oil filter will be further blocked, so that the oil pressure will drop again and low. In the specified value, the oil pressure is too low; some diesel engine oil pressure display device sensors are located at the end of the lubricating oil path, when the filter is difficult, the oil pressure decreases. When it is lower than the specified value, the oil pressure is too low. Then, we should further investigate the reasons for the thickened oil (the choice of engine oil number and season, oil deterioration, etc.) and the obstruction of the oil channel (such as filter section, filter screen, air-cooled radiator, etc.). After identification, it should be excluded.
If the oil temperature drops when the oil temperature is high, the oil viscosity is too small, or there is a large gap or friction between the friction parts. Should identify the reasons for the smaller viscosity (such as improper selection of engine oil grade, poor oil quality, poor viscosity and temperature stability, and the possibility of mixing diesel oil with engine oil and diluting engine oil), observe whether there is oil leakage, or the engine Longer and pressure-lubricated matching parts (such as the crankshaft and the bearing, the connecting rod shaft diameter and the bearing) have a large gap and should be further identified and targeted.
(2) Judgment according to equipment use period
If the oil pressure is too low, the failure occurs during the run-in period. Most suspicions are that the metal shavings in the machine part or the molding sand and other acrobatics block the filter, or that the pipe bends through the oil, or it is improperly assembled and leaks oil. The place (such as the bearing fit clearance is too large, the pipe joints or joints at the joint plane is not sealed). It should be easy to find out the reason and eliminate it afterwards.
(3) Diagnose according to the abruptness and gradual change of oil pressure drop
If the oil pressure suddenly drops, indicating that the pipe or gasket is broken, the oil spill should be identified and removed.
If the oil pressure is gradually reduced with the use of time, the oil pressure should be gradually reduced, check for clogging, wear, engine oil deterioration, etc., find out the cause and eliminate it.
If the engine oil pressure is gradually reduced during normal use, it means that there is a shortage of oil at the bottom of the oil, blockage of the oil line, increase of the fitting clearance of the pressure lubricated parts, deterioration of the oil, etc., which are caused by simultaneous reduction of oil pressure caused by multiple causes. In general, a single cause, although having an impact on oil pressure, will not be too low. During the diagnosis, first check the oil storage and deterioration, if both of these are not in compliance with the requirements, it is one of the reasons for the reduction of oil pressure. The filter should be removed to check the clogging of mechanical impurities. If there is obvious blockage, It is the fault. The clearance between the crankshaft and the associated bearing can also be checked. If the wear increases, it is also one of the causes of the oil pressure drop.
(4) Check the pressure limiting valve
Remove the lower limit pressure valve and install it after cleaning (adjust the spring force). If the oil pressure increases, the oil pressure is too low.
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