I recently acquired a Sweet 16 OB, the hydraulic steering is quirky, some times it tends to lock up until I raise or lower the drive other times its stiff. I have a 1988 Mercury 135 which has steering stops similar to a triple tree on a motorcycle.

Is there a way to rebuild the system or is there some I can check?

I purchased steering fluid and bled the system according to the directions but really didn't make a difference.

Thanks
Tauni