Check the ease and smoothness of the movement of the selector lever and its fixation in each position. Check the indication of the selector lever position indicator, which should match the position of the selector lever.
Check the operation of the mechanism for blocking the movement of the gear selector lever.
Start the engine and check the operation of the gearbox control mechanism.
If malfunctions are found in the gearbox control mechanism, adjust the cable connecting the selector lever to the control valve block and the selector lever slider.