Avoid blocking of one-way valve and vent valve: as a result, the temperature in the case will rise, the oil and gas will fill the whole space and cannot be discharged, which will increase the pressure in the case, increase the consumption of lubricating oil and shorten the replacement period. After the engine ventilation system of concrete mixer truck is blocked, the movement resistance of piston is increased and the fuel consumption is increased. Because of the pressure difference between the inside and outside of the case, oil leakage often occurs at the weak part of the seal. Therefore, it is necessary to regularly inspect, dredge and clean the small concrete mixer;
▌ pay attention to the liner function: the gasket between the stationary parts of the small concrete mixer plays a leak proof and sealing role. If the material, manufacturing quality and installation do not meet the technical specifications, it will not play a role in sealing and leakage prevention, and even accidents will occur. For example, the oil pan or valve cover is not easy to compact due to its large contact area, resulting in oil leakage;
▌ all kinds of fastening nuts on the small concrete mixer truck should be tightened according to the specified torque: the gasket will leak if it is too loose or not tight; if it is too tight, the metal around the screw hole will bulge or the screw thread will buckle and cause oil leakage. In addition, if the oil drain plug of the oil pan is not tightened or loosened and falls off, it is easy to cause oil loss, and then the engine damage accident of "burning bush and holding shaft" will occur;
▌ avoid wheel hub oil spilling of concrete mixer: excessive lubricating grease in hub bearing and cavity, or improper oil packaging, poor quality and aging failure; high temperature of wheel hub caused by frequent braking; loose axle nut, etc., will cause oil spilling from wheel hub of small concrete mixer. Therefore, "cavity lubrication method" should be used to dredge the vent hole;
▌ timely replace the invalid oil seal: many movable parts on the small concrete mixer truck may throw oil due to improper installation, the journal and the oil seal edge are not concentric, and swing. Some oil seals will lose elasticity due to rubber aging. Timely update if leakage is found;
▌ properly solve the sealing of all kinds of oil pipe joints of concrete mixer truck: the truck union nut is often disassembled and disassembled, which is easy to break the thread and loosen, which will cause oil leakage. Replace the union nut, use grinding method to solve the cone sealing, so that the nut is pressed to solve the sealing.
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