Juma,
Since you have no codes then all sensors and switches should be good. Check the arm that goes to the switch for your service brake pedal. The switch has a sweep voltage of 4.5 to 2 volts. If it is not reading correctly or loose, can cause the transmission to loose travel. How many hours on the machine. Verify fluid level and color of fluid. When was the filter last changed? If the filter is black, that came from the factory. This post is old, hope you have already repaired. Good Luck.
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