Seadrive 225 w/ power steering and hydraulic?

[deshet]

I have 1988 seadrive 225. The outboard has hydraulic steering and power steering. When I bought the boat there was a belt disconnect from the top of the motor that looked like it should turn two pulleys. The guy that I bought the boat from said he removed the belt to disable the oil mixing. A boat mechinic I went to said the belt was for power steering.

Basically the other day I went out in the boat and was have steering problems.

I added power steering fluid to a reservoir in the steering wheel base /helm I think that's what it's called

Know the steering seems to be working properly or at least much better but the belt for the power steering portion is not connected. Should I try to connect the power steering belt also?

Why would a boat have power steering and hydraulic steering?

thanks
deshet