A common problem with possibly any tractor is transmission issues. However, this particular model seems to suffer from it more than usual. Most users have mentioned that due to transmission problems, the tractor does not even reverse.
The most likely reason for you to face this problem could simply be due to a malfunction in the hydraulic solenoid valve. However, we recommend that you check whether you are getting any error codes or not. If the error code is determined, you should have a much better time troubleshooting and fixing the error.