Not familiar with a Lowe 170W - Outboard or I/O? Power steering I/O? New to you boat with the problem or it's gotten harder to steer as time went by? Has the swivel been greased?
For either OB or I/O, disconnect the cable at the motor end and see if the steering is easier and the OB or outdrive moves from side to side easily.
From the little info provided, it sounds like a complete helm and cable kit may the best choice after some answers from you.