1 park the unit
2 hold the front brake(right side)
3 look for the big nut with a round nut below the steering l.(almost middle of steering wheel and front shock)
4 then push the steering front and back to see if the round nut is loose
5 use hands to tighten the round nut then tightened the big nut
6 if still shaking or the steering get tight
7 go to the nearest store to make it fix or call for home service maybe bearings are broken