Disconnect the steering cables from the motor and turn the wheel. If it's smooth, your cables are fine. Before i plunked down a chunk of change for new steering, I would pull the shaft out of the tilt tube and clean it up. Use a shotgun bore brush and mop with solvent on the tilt tube until patches come out clean. Then use light oil on the shaft and go back to greasing the zerks
I had the same issuer with a Yamaha and finally figured out that by forcing grease in the zerks I was just adding to the already impacted grease and other trash. It went from hard to steer to smooth as butter.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner