The 2 most common part(s) or condition(s) which cause the symptom Snowblower wheels don't turn are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1781640
If the snowblower wheels don't turn the V-belt might be broken or worn out. The V-belt makes the connection between the engine and the gearbox. If the belt is worn out, misadjusted, or broken the wheels won't turn.
RepairClinic Item # 1810094
If the snowblower wheels don't turn the control cable might be broken or need an adjustment. Check the control cable from the handle lever all the way to the other end and see if it is moving freely. If it's not, a little oil squirted into the end of the cable might help to free it up. If that doesn't work the control cable should be replaced.