My '84 Rude has terribly difficult steering. I don,t mean torque, just very hard to turn the wheel. It's a little better at higher speeds, but takes everything I have to turn the motor at stopped or slow speeds. Is there maintenance to the steering cable, other than grease(or a special type of grease) that I am not doing, or are there grease fittings somewhere behind the wheel, under the dash, that I am not doing? Can the cable just plain wear out? Please help my tired arms. 