The operating environment of the underground loader is relatively bad. Therefore, after a long time of use, it will cause a variety of problems, especially the engine which plays a decisive role in the loader. The early wear of the engine of the underground loader refers to the phenomenon that the power of the diesel engine is greatly reduced and the fuel consumption is increased due to the wear of the main moving pairs of the engine in a short service time, so that the diesel engine can not continue to work. The early wear of the diesel engine mainly has the following reasons:

①新機(jī)不經(jīng)過磨合就大負(fù)荷運(yùn)行。冷車起動(dòng)后，應(yīng)在小油門狀態(tài)下暖車3～5分鐘才能起步行車，起初運(yùn)行時(shí)，應(yīng)小負(fù)荷工作一段時(shí)間，待溫度升高后再大負(fù)荷作業(yè)。

① The new machine runs at a large load without running in. After the cold start, the vehicle shall be warmed up for 3 ~ 5 minutes under the condition of low throttle before starting. During the initial operation, the vehicle shall work under low load for a period of time, and then work under high load after the temperature rises.

②空氣濾清器失效。

② Air filter failure.

③使用保養(yǎng)不當(dāng)，機(jī)油質(zhì)量差。

③ Improper use and maintenance, poor oil quality.

④燃燒不良，使氣缸積炭過多。發(fā)動(dòng)機(jī)剛起動(dòng)后，機(jī)器溫度低，柴油燃燒不完全。此時(shí)，若加大油門，增加供油量，多余的沒燃燒柴油就會形成積炭，使發(fā)動(dòng)機(jī)排放加劇。此外，多余的柴油還可能沿氣缸壁流入曲軸箱，影響氣缸壁潤滑，并會稀釋油底殼的機(jī)油，降低潤滑性能，減少發(fā)動(dòng)機(jī)的使用壽命。  對于裝有廢氣渦輪增壓器的發(fā)動(dòng)機(jī)，更應(yīng)注意暖車。  如果起動(dòng)后立即加大油門，渦輪的轉(zhuǎn)速升高，而機(jī)油來不及到達(dá)各潤滑部位表面，形不成良好潤滑，很容易產(chǎn)生渦輪轉(zhuǎn)軸卡死的現(xiàn)象，造成故障。

④ Poor combustion causes excessive carbon deposition in the cylinder. After the engine has just started, the temperature of the machine is low and the diesel combustion is incomplete. At this time, if the throttle is increased and the fuel supply is increased, the excess unburned diesel will form carbon deposits, which will aggravate the engine emissions. In addition, excess diesel may flow into the crankcase along the cylinder wall, affecting the lubrication of the cylinder wall, diluting the oil in the oil pan, reducing the lubrication performance and reducing the service life of the engine. For engines equipped with exhaust turbocharger, pay more attention to warming up. If you immediately increase the throttle after starting, the speed of the turbine will increase, and the oil will not reach the surface of each lubricating part before it can form a good lubrication, which is easy to cause the turbine shaft to be stuck and cause faults.

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