Construction machinery bulky, tough appearance, in fact, it is very need to maintain, and once the maintenance is not good, there will be a variety of problems.
Therefore, we must know that the following 9 kinds of situations are the maintenance of construction machinery and equipment taboos, can not touch.
First, butter smeared casually
The main function of butter is to lubricate and seal. Therefore, never apply grease on the cylinder pad, because if you apply grease on the cylinder pad, when the cylinder bolts are tightened, there is bound to be part of the grease flowing into the cylinder. The remaining butter in the outside will be affected by the high temperature, resulting in the cylinder pad, cylinder head and the plane between the gap, which in turn reduces the original seal cylinder gasket.
Two never change the engine oil
Oil plays a very important role in construction machinery. But a lot of the repairman forgot about the oil quality inspection and the change of the engine oil. Long term only add and not replace the oil, it will cause many parts of the engine caused by wear far beyond normal state. Moreover, the diesel engine in the process of operation, there will be dirt into the engine oil, if the regular replacement of the oil, it is easy to cause burning tile, axle and other accidents.
Three, cylinder and piston products are not assembled, that is installed
Some maintenance workers in the maintenance of new cylinder and piston products in the face of the time, often do not look at specific size. This will cause a lot of cases of cylinder and piston products are not matching, if the largest size of the cylinder with the smallest size of the piston, will make the gap between the two too large, compression weakness.
Four. Using open flame heating piston
Never for the sake of convenience, the piston pin is directly placed on the open flame for heating, so that the heating expansion. Because of the various parts of the piston thickness is not uniform, put on fire heating will cause the uneven heating, then easily lead to deformation. Therefore, the correct way of heating is to put the piston into the hot oil heating.
Five, emery cloth polishing pad
Some technology does not pass the repairman in the direct use of emery cloth grinding scraping wh. However, in the process of grinding with abrasive abrasive sand on extremely easily embedded into alloys, accelerated wear of diesel engine crankshaft neck.
Six bolt tightening
In general, many parts of the torque for the bolt are required. However, many of the mechanic did not think so, they will try to screw it tight, it is easy to cause the bolt or wring thread stripping.
Seven, tire pressure is too high
In summer, the main reason for the blowout of the construction vehicle is that during the process of inflating the tires, many repairman do not pay attention to the problem of tire pressure.
Eight, add cold water to boil water tank
Boil water tank with cold water will cause the cylinder head and the cylinder block cracking, this time should be the first to stop the engine, after natural cooling in water.
Nine, the measurement between cylinders is not accurate
Measuring cylinder clearance should be measured in the direction perpendicular to the piston pin hole of the piston skirt. But a lot of the repairman, when measuring, would measure it in the other direction because he didn't notice it at once. However, because the skirt section is oval, the gap between cylinders is not equal.