Jinan second-hand gearbox maintenance automatic car is easy to open because it is easy to open in urban roads, but the automatic gearbox is more "squeaky". After many years of use, it is easy to malfunction.
Automatic transmission maintenance is the most complex system in vehicle repair. A new gearbox costs less than 10,000 yuan, and more than 100,000 yuan. Since the owner knows little about maintenance knowledge, small repair shops generally like to use some cheap automatic transmissions to trick car owners. Some dealers in Guangzhou and other places often enter the automatic transmissions on old or scrapped cars from abroad. After painting and renovation, they are sold at low prices to some repair shops in the mainland. Such refurbished gearboxes are also frequently seen in the Hangzhou market. Without attention, it is easy to use in your own car.
In addition to blinding the owner with a refurbished gearbox, the maintenance cost of the gearbox is relatively confusing. According to industry insiders, many consumers choose to repair because of the high cost of replacing the new transmission. In fact, many automatic transmissions fail to repair even some 4S stores. Due to the difficulty of repair and the fact that this piece is still blind to consumers, the repairer often arbitrarily quotes. The same problem here is 4,000 yuan, and another place may become 8,000 yuan.
Reminder: The owner must go to the repair shop with a large number of professional technicians and a complete set of accessories and tools to ensure the maintenance quality of the automatic transmission.
Jinan second-hand gearbox troubleshooting
The splitter of the Fuller intermediate shaft nine-speed transmission is shifted by the pneumatic system. The pneumatic system includes an air filter regulator, a double H air valve, a sub-box shift cylinder, and a connecting air pipe. Failure of the pneumatic system may cause gear shift failure, stagnation, or damage to the auxiliary transmission parts. Master the working principle of the pneumatic system and make a simple inspection to identify the problem and repair it in time to eliminate it.
The air filter regulator reduces the compressed air from the vehicle air reservoir to a pressure of 0.41 to 0.44 MPa and enters the intake port of the double H valve. The air outlets of the double H air valve are respectively connected to the high speed zone of the shift cylinder and the air inlet of the low speed zone. Inspection of the failure of the pneumatic system: The inspection of the pneumatic system should be carried out when the engine is turned off and the vehicle air pressure is at the maximum nominal value. Check whether the air pipes are installed correctly, whether there is any intersection; check the joints of all the air pipes for leaks; check all the air pipes for cracks, whether they are flattened by other parts and affect the airflow.
Air filter regulator inspection: parts with or without defects, leakage; in the vehicle pressure reached 0.7 ~ O. At 8 MPa, install a barometer at the exit to see if the air pressure is adjusted to O. 41～O. 44MPa, if it does not meet the requirements, it should be replaced.
Double H gas valve inspection: check for defects; check whether the pin is reciprocating freely and wear too much; check whether the pin is out of the air outlet after the compressed air is in the original position; the pin is forced to the lowest position When compressed air is introduced, whether the compressed air flows only from the air outlet. If so, the double H valve is available, otherwise it should be replaced.
Inspection of the sub-box shift cylinder: If there is still a shift problem after the above inspection, the O-ring or other seal on the cylinder piston may be defective.
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