In view of the common faults of Komatsu excavator, such as the whole vehicle is weak, the excavator moves slowly, the excavator emits black smoke, and the excavator oil temperature is high, this paper gives a detailed cause analysis and maintenance methods
Fault phenomenon: a Komatsu excavator of only 5000 hours has recently found that the whole machine is weak, the action is slow, and the oil temperature is also high. The excavator's action is very uncoordinated, there is a stagnation phenomenon, and the walking is also weak In addition, during the last construction, the excavator overturned due to improper operation. When it was lifted to make sheet metal, there was blue smoke after startup. As long as the excavator didn't refuel, it would still emit blue smoke after the fuel nozzle was calibrated
The Komatsu excavator is weak, slow and emits black smoke:
It is recommended to check the supercharger first. It may be a problem with the supercharger If there is no problem with the supercharger, it may be due to improper lubrication of relevant engine components during the overturning of the excavator, resulting in wear of piston rings and cylinder liners
It is concluded that the Komatsu excavator is weak, slow and emits black smoke. The possible reasons are as follows:
The valve element is stuck. The pressure of the boom safety valve is insufficient. The boom oil supply pipe is too small. The pilot oil passage is blocked. The oil inlet hole of the boom pilot valve element is smaller than that of other pilot valves
Komatsu excavator is weak, slow and emits black smoke. Inspection method:
Drain the hydraulic oil first and find that the hydraulic oil has turned milky white (why does the hydraulic oil turn white? After a long time of use, the hydraulic oil will not be viscous enough, and then some places will leak into the hydraulic tank, and the mixture will become white, which will increase the wear of the excavator.) it is too dirty to open the hydraulic oil tank! The oil suction filter and the oil return filter are sticky and full of sundries, which are all covered in the filter screen. The cause of fault analysis is that the sundries block the filter screen, resulting in insufficient oil supply, resulting in high oil temperature and weakness of the excavator. It is necessary to replace the three filters and hydraulic oil. After finding the cause, drain the oil of the oil cylinder and the large pump
Then clean the hydraulic oil tank and dry it with a clean towel After cleaning all parts of the oil tank, find the place where the water is leaking. After inspection, it is found that there is water rust on the oil suction filter screw. It is judged that water is entering the upper part of the respirator, and then the oil will turn white After all maintenance, the test machine feels normal. The pressure commissioning reaches 24 and the pilot pressure is 4, which is within the normal range.
