During construction in summer, the main concern of the owner is the black smoke failure of the engine in the rental work of the land and water excavator, because the failure not only causes great damage to the engine itself, but also takes a lot of time and effort to repair. Many owners have also had the experience that they can only stop work and hire a repair teacher Fu for repair at a high price.
Black smoke from the rental work of land and water excavators
In fact, it is difficult to repair the black smoke fault. On the other hand, it needs to be carefully repaired in strict accordance with the fault conditions to ensure complete repair. Today, let's take a look at a black smoke fault case recently repaired by the engineer.
The fault phenomenon has some particularities relatively. When the fault machine is idling, it is normal no matter at high speed or low speed, and there is no black smoke, but there is obvious black smoke when the load is added.
Black smoke in the rental work of land and water excavators
If you want any details and failure reasons, you must first understand whether the machine has been maintained or replaced in the near future before repairing the machine. It is reported that the machine has replaced the valve seat ring and four matching parts due to the valve seat ring falling off not long ago. After the test run, there was black smoke.
After knowing the basic information, engineers began to collect performance curves and found that the suction pressure of the machine can only reach 190m.
Due to the low suction pressure, according to this situation, the engineer began to check the intake pipe and found no deformation, looseness or cracking.
Next, the engineer continued to check the supercharger and found that the impeller on the exhaust side of the supercharger was partially damaged. It can be basically determined that the failure point is caused by impeller damage.
Troubleshooting of black smoke in the rental work of land and water excavators in summer
According to the maintenance process, the engineer replaced the new supercharger and tested the machine normally. There was no similar situation after a working day, and the problem was completely solved.
Let's briefly review and analyze the fault with you. Since the fault often occurs on the machine that has been repaired with valve seat ring, the engineer infers that the fault is caused by the valve seat ring falling off and entering the combustion chamber, and the exhaust gas entering the exhaust side of the supercharger, damaging the impeller on the exhaust side, and finally leading to the fault.
Inspection of supercharger in the rental work of land and water excavator
In the early stage, when checking the supercharger, generally remove the intake pipe, observe whether the intake impeller is damaged, and check whether the clearance of the shaft is normal. Or observe whether there is oil leakage, rarely check the exhaust side. In general, there is no problem with the exhaust side. However, in the special case of valve seat ring falling off, the impeller on the exhaust side shall be inspected.
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