1. Adjustment of valve foot clearance: during the normal operation of various parts of the valve arrangement, the valve foot clearance will be changed with the wear of parts. For example, after the cam, valve stem end face and tappet contact surface are worn, the open space will become larger, while after the valve head and valve seat are worn, the open space will become smaller. Therefore, the base value of the open space should be taken in the adjustment.
2. Valve seat reaming: valve seat reaming is usually manual operation, so we should pay special attention to three questions: first, on the basis of eliminating depression and mottle and being able to ream out a perfect cone, the smaller the reaming amount, the better; Second, the force during reaming shall be uniform, the starting and closing of the knife shall be light, less reaming and more investigation, so as to ensure less reaming amount and higher finish; Third, trial fit with the valve to determine the orientation and width of the working surface.
3. The repair quality of automatic mixer truck is poor. The outstanding question in the repair operation is that the processing quality of the working surface of valve and valve seat can not meet the requirements, which constitutes the ablation and depression of the working surface and early damage; During the scraping of camshaft bearing, its cooperation space, contact area and concentricity of each bearing can not reach the request, which accelerates the wear and presents abnormal noise, resulting in early damage; When the valve guide is replaced with a new part, the reaming quality can not meet the requirements, which directly affects the service life of the valve and valve seat.
The self-propelled mixing forklift with a large load capacity purchased by the user of the automatic mixing truck shall be based on the principle of practicality and sufficiency, and shall not be used for excavation and handling a large amount of loose materials. It shall be determined according to the size of the operation volume: it shall not be too large or too small, which will cause waste and too small will not be enough for use. The transmission filter is blocked and the hydraulic transmission oil filter is blocked, resulting in poor oil supply and low transmission oil pressure. Find out the cause of the blockage and replace the oil and filter in time.
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