Oil in the use of diesel engines is essential, mainly from the lubrication, cooling, cleaning and so on. Therefore, many drivers will pay attention to check the amount of oil, and added according to the standard, but ignoring the oil quality inspection and replacement of the oil has been bad, resulting in some of the engine movement is always in the poor lubrication equipment Environment, thereby accelerating the wear and tear of the various parts. Under normal circumstances, the loss of oil is not large, but it is easy to pollution, thus losing the role of protection of diesel engines. During the operation of the diesel engine, many dirt (soot, coke and fouling, which are generated by the incomplete combustion of the fuel), enter the engine oil. For new or overhauled machinery, after the test run will be more impurities, if only add not change to eager to put into use, it is easy to cause burning tiles, axle and other accidents. In addition, even if the replacement of oil, some drivers due to lack of maintenance experience or easy way, will not completely clean the replacement of the oil duct, the mechanical impurities remain in the oil pan and oil.
2, concrete mixing truck bogey cylinder and piston new installation without the matching
In the replacement cylinder liner and piston, that the new cylinder liner and piston are standard parts, are interchangeable, can be installed to use. In fact, the size of the cylinder liner and the piston has a certain tolerance range. Such as the largest size of the cylinder with the smallest size of the piston cylinder, with the gap will cause too much, resulting in compression weakness, starting difficult. Therefore, the facelift must be checked when the size of the standard cylinder and piston group code, installed cylinder and piston must be the size of the standard piston grouping code and the standard size of the same sub-cylinder liner grouping, the only way to ensure that between the two With a standard fit gap. In addition, the cylinder with the same group code of the cylinder liner and piston at the same time, but also pay attention to pre-installed test cylinder gap, in order to ensure assembly standards, should also be installed before the first test to prevent fake substandard products .
3, concrete mixing truck open fire ignite the Pistons
As the piston and piston pin is the interference fit, so when installing the piston pin, the first expansion of the piston should be heated, then, some maintenance personnel will be on the fire directly on the piston heating, this approach is very wrong, because Pistons of various parts of uneven thickness, thermal expansion and contraction will not be the same, open flame heating will make the piston heat uneven, easily lead to deformation; piston surface will be attached to charcoal, reducing the life of the piston. If the piston reaches a certain temperature after the natural cooling, the microstructure will be damaged and greatly reduce the wear resistance, its service life will be significantly shortened. In the installation of piston pin, the piston can be heated evenly in hot oil to slow expansion, must not be directly heated with open flame.
4, concrete mixer hanged abrasive cloth bearing abrasive
For some inexperienced repairman, the bearing is a difficult task, due to scraping tile technology is difficult to master, so the bearing is difficult to meet the technical requirements, for this, it was replaced when the bearing, in order to increase the bearing and crankshaft Of the contact area, polished with emery cloth instead of scraping
tile. This method is extremely undesirable in practical maintenance, because the abrasive grains on the abrasive cloth are harder and the bearing material is softer, so that the sand particles are easily embedded in the alloy during grinding, and the work of the diesel engine accelerates the wear of the journal, The service life of the crankshaft.
5, concrete mixer bar bolts tighten avoid too tight
Construction machinery in the disassembly process, many parts of the bolts are required torque requirements, such as transmission box, cylinder head, tires, connecting rod and
the front axle and other parts, tightening torque in the instructions have special provisions, must not Free to change. But many users have mistakenly believe that some will be more secure tight, but too tight will cause screws or bolts broken, but also may be due to screw or nut slip caused by failure.
6, concrete mixer truck tire pressure is too high
Wheeled construction machinery tire inflation pressure is to determine their useful life and work efficiency of the important factors. Tire pressure is too high or too low will affect its service life, but also not conducive to safe driving, especially in the hot summer. Scientific inflation standards should be: the standard tire pressure as a benchmark, with the temperature changes, a slight adjustment on the tire pressure fishes. For example: the summer should be lower than the winter 5% -7%, due to the summer to take into account the high temperature, gas heating, pressure increases, the opposite must be achieved in winter standard air pressure or slightly higher.
7, concrete mixer bogey water tank add boiling water
Engine overload, poor heat or water tank will cause the water tank boil, this time if you add cold water immediately, because of thermal expansion and contraction will lead to cylinder head and cylinder burst. Therefore, the use of the water tank once found boil, emergency measures should be taken to stop the operation, so that diesel cooling water to cool down.
Hubei Changjie Special Purpose Vehicle Co. Ltd
Contact Name: Mr. Suan Yin
E-mail: cj802@urspv.com
Mobile phone: +8613886881673
Tel: +(00)867223229933
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