When the gearbox is automatically out of gear or in disorder.

You need to check the positioning device of the shift control valve. The main reason for the failure is the serious wear of the positioning steel ball or the failure of the spring;  (2) Due to long-term use of the joystick, the position and length of the lever have changed, and the ratio of the levers is not accurate, which will lead to deviations in the operating position and misalignment.