I have a 773 Bobcat. I had to replace the hydrostatic drive motor seals due to the fluid going into the gear case. My question is with the drive motors. One motor your can rotate the shaft by hand and the other one you can not move at all. I was wondering if this one is locked up and what would cause this. This is also the side that the seal was leaking. I am adding a picture of the motor I am referring to. Thanks for the help.