Excavator maintenance taboo

[DIG-DOG]

1. Smear the butter carelessly
The main function of butter is lubrication and sealing. Therefore, sometimes during the maintenance process, the repairman will apply butter on the cylinder pad, thinking that this can increase the sealing performance of its diesel engine. However, this approach is really wrong. Because, if butter is applied to the cylinder gasket, when the cylinder bolt is tightened, some of the butter will inevitably flow into the cylinder. The remaining butter in the outside will also cause a certain gap between the cylinder pad, the cylinder head and the body plane after being affected by high temperature, which will reduce the original tightness of the cylinder pad.
Two, never change the oil
The role of oil in construction machinery is particularly huge, and many repairmen attach great importance to it. They add exactly as required by the standard. However, many repairmen forget to check the quality of oil and change the oil. For a long time, just adding oil without replacing it will make many parts of the engine work in a poor lubrication environment, and the wear caused by it is far from normal. Moreover, during the operation of the diesel engine, a lot of dirt will also enter the oil, if the oil is not replaced regularly, it is easy to cause accidents such as burning tile and holding shaft.
Third, cylinder liner and piston products are installed without combination
Many repairmen think that new products should be standard parts when they are repaired. Therefore, in the face of new cylinder liner and piston products often do not look at the specific size. This will cause many times the cylinder liner and piston products do not match the situation, when the largest size of the cylinder with the smallest size of the piston, it will make the gap between the two is too large, and the compression is weak.
Four, the use of open fire heating piston
In the process of installing the piston pin, the piston should be allowed to expand by heat. Many maintenance personnel in order to coax convenience, directly put it on the open flame for heating. However, because the thickness of each part of the piston is not uniform, heating on the open flame will cause its uneven heating, and finally it is easy to cause deformation. Therefore, the correct heating method is to heat the piston into the hot oil.
Five, abrasive cloth grinding bearing shell
Scraping tile is a relatively high technical content of construction machinery maintenance work, many repairmen because of their own technology is not up to standard, will be in the process of scraping tile directly with emery cloth grinding. However, in the process of grinding with emery cloth, the sand particles on the emery cloth are extremely easy to be embedded in the alloy, accelerating the wear of the diesel engine journal.
Six, the bolts are tightly tightened
In the process of construction machinery maintenance, in fact, it is not the tighter the bolt, the safer it is. This is mainly because many parts are required for the torque of the bolt. However, many repairmen do not think so, they will screw it as tightly as possible, which is easy to cause the bolt to break or thread slip.
Seven, tire pressure is too high
In the process of inflating the tire, many repairmen do not pay attention to the problem of tire pressure. This is easy to cause the situation of summer construction vehicles to burst tires.
Eight, water tank boiling add cold water
In the engine overload operation, poor heat dissipation and other conditions will cause the water tank to boil. The first reaction of many repairmen is to add water. However, if you add cold water at this time, it will cause the cylinder head and cylinder block to burst, so the engine should be stopped at this time, and the water should be added after its natural cooling.
9. Inaccurate measurement between cylinders
The cylinder clearance should be measured in the direction of the piston skirt perpendicular to the piston pin hole. However, many repairmen will measure in other directions because they do not pay attention to it for a while. However, because the skirt section is elliptical, the cylinder clearance is not equal.

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