metal black screw

When bolts metal black screw are used for a long time, the thread is damaged, the disc spring washer fails, or the flat washer is cracked and deformed, and the nut cannot play a good locking effect, resulting in loosening of the nut. (5) The wheel nut positioning ring is damaged or missing, or the inner hole of the steel ring is out of round due to the deformation of the screw hole. When installing the tire, the operation is simplified. The wheel nut is not tightened diagonally

, but is in place at a time, and tightened one by one. For bolts without a central positioning sleeve, this method of operation will cause the bolts to be positioned off-center. The nuts have been tightened during assembly. However, due to the asymmetric arrangement of bolts and screw holes, the tire rotation radius is not equal, and the nut will soon be turned on the wheel. Song Kuang. (6) Pay more attention to use and neglect maintenance, and the driver and repairman have a weak sense of responsibility.

There is no regular inspection in accordance with the requirements of the specification, and some inspections are conducted but are not serious. 2. Aiming at the cause of the tire screw fracture, effective prevention should be carried out from the following aspects (1) The driver must check the technical condition of the tire and wheel bolt before leaving the car, during driving, and after shifting. If it is found to be loose, report for repair immediately. Can't get sick out of the car

. (2) Compulsory maintenance operations shall be carried out according to technical requirements, and the maintenance interval mileage shall not be extended at will. The repairman should follow the work specifications. During the first level maintenance, the hub nut must be checked and tightened. The secondary maintenance operations must be clean, check the condition of bolts, nuts, threads, clean and check the wear condition of the screw holes of the steel ring, check the deformation of the positioning sleeve, washer, steel ring and the inner ring of the steel ring, and the flatness of the steel ring end surface .  

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