I moved your post out of an old thread in the wrong section to the Hydraulic Lift System section. You should get better responses here.
I think, since you are replacing the motor and the reservoir (and possibly the pump?), you'd be certain to get the correct parts from J&R Repair or Midget RV. They are both in Ohio and they specialize in HiLo repairs.
Have you already removed the hydraulic motor? I think that is what's causing our issue. I just need to know how to remove the motor so I don't damage anything else.