1. During the maintenance of mixer truck, if the valve is ablated, pitted and sunken, it shall be polished, which is generally carried out on the grinder. Four problems need to be paid attention to during operation: first, ensure that the valve head is concentric with the rod, otherwise it shall be straightened first; Second, on the premise that the smooth grinding vehicle can grind a complete cone, the smaller the better; Third, try to improve the surface finish; Fourth, the depression at the end of the valve stem shall be ground flat.
2. The fit clearance between the hinge pin valve stem and the valve guide of the valve guide is the key to determine the service life of the valve guide. Therefore, when replacing the new valve guide, the fit clearance shall be strictly controlled when the hinge pin is used, and the lower limit of the clearance shall be specified for each mixer model, which can effectively prolong the service life.
3. Valve grinding valve grinding can be divided into two situations: first, there are only slight pits between the valve and the valve seat, and there is no need for smooth grinding and grinding during hinge pin; Second, the valve and valve seat are ground after smooth grinding and hinge pin. The former shall be grinded with full gold steel sand first, and then the pitting shall be grinded off, and then grinded with fine emery and coated with engine oil until the sealing meets the requirements and the width meets the regulations. The latter can only be grinded when the sealing performance fails to meet the requirements, but pay attention not to use excessive force during operation. It is strictly prohibited to knock the valve up and down, otherwise concave sand marks will appear, affecting the maintenance quality.
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