The sealing of the hydraulic system is the primary step in the performance inspection of the transmission valve. The transmission valve controls the operation of the clutch and brake by adjusting the hydraulic pressure, so any oil leakage will cause the hydraulic pressure to drop, which will cause serious problems such as gear shift failure, slip gear or control failure. Therefore, after installation, a comprehensive sealing inspection should be carried out on key parts such as the valve body, each interface, oil channel joint and sealing ring to ensure that there is no oil leakage. The pressure holding tests in the cold and hot working conditions are usually used to verify the sealing effect, and to observe whether there are oil leakage marks at the bottom of the gearbox. If abnormalities are found, the sealing assembly and bolts need to be disassembled immediately and rechecked to ensure the reliability of the system.

The communication status and function inspection of the electronic control system are also important links that cannot be ignored. Modern transmission valves are usually composed of multi-channel solenoid valves and pressure sensors, and their normal operation depends on efficient communication with the transmission control unit (TCU). After installation, professional diagnostic equipment must be used to self-check the electronic system to ensure that the signal of each solenoid valve is normal, and that the voltage and current values ​​are within the standard range. At this stage, you also need to read the fault code to confirm whether there are electronic control abnormalities such as short circuit, open circuit or signal interruption. At the same time, each solenoid valve should be triggered to verify the flexibility of the valve core and ensure no stagnation or delay.

The establishment of hydraulic pressure is also a key inspection. After completing the filling and exhaust of the hydraulic system, the pressure response of the system should be monitored in real time. By connecting the pressure sensor, the pressure change curve of the oil circuit in different shifting states is read and compared with the theoretical value. If the pressure establishment speed is found to be too slow, the pressure fluctuates abnormally or the stability is poor, it may indicate that there are still problems such as air residues, pipeline blockages or abnormal valve core operation. In addition, it is necessary to pay attention to the stability of the hydraulic system under high temperature conditions, ensuring that the pressure remains within the design standards after long-term operation, and preventing seal failure caused by thermal expansion.

Functional testing after system calibration is an indispensable part of gearbox valve inspection. The calibration process includes self-learning of the clutch occlusion point, gear ratio recognition, and hydraulic adjustment adaptive initialization. After installation is completed, a complete calibration process must be performed to ensure that the valve body control logic is fully matched with the vehicle's electronic control system. After calibration is completed, dynamic testing is required in different driving modes, including starting, acceleration, deceleration, reverse and climbing, etc., to verify the response time of shifting, power interruption time, shift impact degree and the accuracy of the system feedback signal. Any shifting lag, jumping or stuttering may indicate hidden dangers in the valve body function, and troubleshooting and adjustments need to be carried out in a timely manner to ensure the smooth operation and efficient performance of the system.