you can drive it around but i would recommend locking out that motor using the lockout mechanism on the hub of the wheel in question.
If you look at the drive hub there is a cap with a dimple on it, has two 1/4" bolts holding it on. Take it off and flip it over with the dimple pointing inward. Once you get it off you'll see a release pin inside, that dimple pushes on that and unlocks the gears inside the drive hub.
I wouldn't recommend driving it this way except only to move it from one area to the place you're going to repair it. Do not drive it like this full time. With a bad drive motor you will experience problem driving it over terrain or up hills etc.
There could also be something wrong with the drive manifold causing that issue. You need to get a 5000 psi pressure guage and test pressures on the drive system and make sure all the pressures are correct according to the manual. Also checking drive motors and the drive manifold valves can be a task to do, and can get messy.
if you're not a genie tech i would strongly recommend calling one in for this.