1. Boiling water tank with cold water
In excavator engine overload operation, poor heat dissipation and other conditions will form the situation of water tank boiling. Many repairmen's top response is to add water.
However, if cold water is added at this time, the cylinder head and cylinder body will burst, so the engine should be stopped at this time, and then water will be added after its natural cooling.
2. Never change oil
The effect of excavator oil on the side of excavator is especially great. Many repairmen attach great importance to it. They increased in full compliance with the norms. However, many repairmen have forgotten to check the quality of the oil and replace the transformed oil.
If the engine oil is added for a long time without replacing it, many parts of the engine will work in a poor smoothness environment, resulting in much worse wear than normal.
Moreover, in the process of diesel engine operation, a lot of dirt will also enter into the oil side, if the oil is not replaced regularly, it is very simple to cause accidents such as burning tile, holding axle and so on.
3. Random modification of butter
The main effect of excavator butter is smoothness and sealing. Therefore, sometimes the repairman will paint butter on the cylinder gasket beside the repair process, thinking that this posture can increase the sealing function of the diesel engine.
However, this is a big mistake. Because if butter is painted on the cylinder gasket, when the cylinder bolt is tightened, a part of butter will flow into the cylinder side.
After being affected by high temperature, the remaining butter will form a certain gap between the cylinder pad, the cylinder head and the plane of the body, which will reduce the original sealing of the cylinder pad.
4. Grinding Bearing with Sand Cloth
Scraping tile is a relatively high skill content of excavator repair side work, many repairmen because of their own skills are not qualified, will be in the process of scraping tile with sand cloth to grind directly. However, in the process of grinding with abrasive cloth, the sand particles on the side of abrasive cloth are very simple to be embedded in the side of alloy, which accelerates the wear of diesel engine journal.
5. Installation without combination of cylinder liner and piston products
Many repairmen think that new products should be standard parts when they are repairing. Therefore, in the face of new cylinder liner and piston products, often do not look at the specific scale.
This will lead to many times when the cylinder liner and piston products do not match. When the largest cylinder is equipped with the smallest piston, the gap between the two will be too large and the contraction will be weak.
6. Bolts tighten desperately
In the process of excavator repair, in fact, the tighter the bolt is, the safer it is. This is mainly because many parts are required for bolt torque.
However, many repairmen do not think so, they will try to screw it to the tightest possible, which simply forms a bolt break or thread slip.
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