The master explained the signal and meaning of the excavator overhaul

Many friends in the construction machinery industry say that their machines have no strength, they are burning blue smoke and burning oil, and the machines are not working. It is very distressing. In fact, these are the signals of machine cylinder wear, as long as proper maintenance is carried out. Maintenance, the excavator spare parts will resume power.

    1. What is the overhaul of the diesel engine?

    "Overhaul" is only to replace the four components of the engine cylinder and the bearing bush, seals, grinding or replacement of the deformed parts. "Four matching" refers to: cylinder liner, piston, piston ring, piston pin, piston pin snap ring and cylinder Set of water ring and other parts.

    Second, why should I overhaul the excavator engine?

    It can be seen that the overhaul master is replacing the wearable parts in the cylinder. So which are the parts that are the most prone to wear?

    First of all, several of the cylinders fit [piston-piston ring], [piston ring--cylinder liner], [piston-piston pin].

    In these several combinations, the most prone to wear [piston ring--cylinder liner]. The piston ring has three channels, two gas rings and one oil ring, which play the role of sealing gas, heat conduction, lubrication, oil scraping, etc. Wear and tear, it will leak (causing the whole vehicle to be weak, difficult to start), oil leaks into the combustion chamber (blue smoke, burning oil).

    [Piston--Piston Ring] It is easy to deposit carbon. The piston working chamber needs to reciprocate quickly. The mechanical wear impurities and the impurities left by the intake impurities accumulate in the gap of the piston ring. Over time, the piston ring is displaced. , sliding, and then strain the cylinder liner, the worst result is to bite the cylinder, pull the cylinder, take the cylinder and so on.

    [Piston and piston pin] generally do not have any problems, but we have also received some cases of the card ring forgotten, the result is to directly destroy the cylinder.

    Third, under what circumstances need to overhaul the komatsu excavator spare parts engine

    1, the whole vehicle is weak

    2, take the blue smoke

    3, burning machine oil

    The above is not absolute. It should be combined with the use of the machine. Some owners will ask: "I am weak, what is the reason?" This kind of consultation makes it difficult for us to answer. When asking, we must clearly explain the machine's use time. Do earthwork or ore work, maintenance, etc. so that we can analyze the cause of machine failure.

    Generally speaking, the machine works in earthwork, under normal maintenance conditions, 8000-10000 hours overhaul is normal. Mining, broken hammer, use of inferior filter, maintenance is not timely, 4000 hours may require overhaul. There are new cars if the running-in period If the excess work causes early grinding, it will require overhaul for hundreds of hours.

    Fourth, some precautions after the overhaul of the excavator spare parts

    In theory, the machine after the overhaul can reach more than 95% of the working capacity of the new machine. However, after all, the whole engine is not replaced, and the performance of the running-in period (there is a running-in period after the overhaul), the performance of the whole car will also be uneven. Not uniform.

    have to be aware of is:

    Cylinder without cylinder liner. Since some machines need to be smashed during overhaul, the cylinder will wear off the net on the cylinder wall, so it has a great influence on the oil lubrication in the cylinder. Sometimes the effect will be worse than before the overhaul. So Here, I would like to remind all friends to add cylinder liners when needed. The choice of cylinder liners should try to choose high-quality accessories with netting technology. The cylinder liners of domestic small factories are generally not netted or the texture is very poor. The original or imported Brands generally use surface quenching technology and mesh grinding technology cylinder liners have the following advantages:

    * The cylinder liner has good wear resistance

    * Good oil release (the oil is attached to the groove in the groove, and the lubrication condition is greatly improved compared with the past)

    * Reduced oil consumption

    * There is almost no running-in period https://jnjmzm.wixsite.com/sdjygcjx