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Semi trailer run-in period.The operating load shall not exceed 80 percent of the rated load;Fasteners such as hub bearing, temperature, leaf spring and wheel should be observed to be fastened after the speed of 150 km. Fasteners driving about 40 km can be normally used after three times.During the run-in period of semi-trailer, attention should be paid to all problems during the run-in period.In the trailer running should pay attention to check whether the brake is hot, no smell, whether the trailer running device deviation, in case of abnormal phenomenon, should stop immediately for inspection.Stone, iron, hard and hard materials should be handled carefully so as not to damage the trailer car;Shipper's firewood, etc., tied with a rope, secured to the trailer compartment buckle.Unit startup should be stable.Do not put your feet on the brake pedal and minimize emergency braking.