Rob, a lot depends on how far and how fast it was towed. But moving more than a few yards or more than a slow walk can definitely cause damage.
But before you start taking things apart make sure the input shaft to the hydro is turning with the engine running. A sheared pin at either end of the drive shaft will give you the same symptoms.
But before you start taking things apart make sure the input shaft to the hydro is turning with the engine running. A sheared pin at either end of the drive shaft will give you the same symptoms.