I have a 03 tzx 190 with hydraulic steering and 2 of my friends both have a 07 zx 190 with hydraulic steering, they both have hard steering when they get on plane , wondering if anyone else has this problem. mine steers like a vehicle with power steering. They both have torque tabs and are positioned correctly. how do you check the fluid in the hydraulic steering although one says he had his serviced at a local dealer thats why i think it could be something else. What is the srew on top of the steering shaft behind the steering wheel for is this to add fluid? Any help would be greatly appreciated