Getting at the cable attachment on the steering arm can be tough, I replaced the steering actuator on mine and it wasn't a fun job, while you're in there take a good look at the actuators, any sign of leaks replace them, you don't want to have to do that twice. Figure on removing the exhaust system rubber hoses and 90* aluminum down pipes to get access, I just removed the whole system with the exhaust elbows intact.
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Here's a pic of the mount for the steering actuator, there are 2 pins with cotter pins underneath, the large one (#4) is for the steering arm that connects to the drive, the smaller one (#2) connects to the cable. The one for the cable is what you have to remove, I was able to get both of these loose & removed them when I did the actuator, greased them will with Evinrude triple guard. I may do my cable and helm unit next fall as they are original, but trust me this job will test your patience.
Get penetrating oil (Kroil, Freeze off, Free all) and a cotter pin puller. Removing the actuator itself, was a pain due to the large cotter pins for the mounting bolts (parts #s 14 & #15). Those gave me hell for a day or two to remove, remember that the transom mount is aluminum and you don't want to get too tough with it. Got it done, but not easy.
1st pic, removed whole exhaust system to get access;
second pic, this shows where the cable connects to the actuator:
3rd pic, say hello to my little friend, without this tool, I could not have gotten this done.....