Nh ls170 drive issues

[welderman2s]

Working on a ls170. Customer said the right wheels locked up and would not move. They drug it out of the way an called me. When trying to move it the left side works and the boom all works. Right side does nothing doesn't even give a strain on the motor or noise from hydraulic pump. I have the wheels off chains are all good. What should I look for. And what's the best way to press the drive motor out of the gearbox...