Cheap and cheerful chute turner mod with minimal welding required. If you run past the cable limits you break the cable and get to fix it. I seem to manage this about once a season.
I replaced the hand crank with a short shaft and used a lovejoy coupler to take up any mis-alignment between the hydraulic motor and chute turner shaft. The motor was a spare I had kicking around, you don't need anything fancy or expensive. Slower speed motor is easier to control.
Here's a nice trick - I added UHMW tape I bought off amazon as a UHMW sliding surface to stop ice from binding in the chute rotator. Works better than lube sprays and has lasted 3 season so far.
The plastic ring is homebrew from an old HDPE/UHMW water jug.I may try the UHMW tape on mine, although I'm not really experiencing and problems. Did your blower come with the plastic ring that the chute actually sits on? I suspect that would allow the chute to rotate much easier.
I went the lazy route when I added hydraulics to my LuckNow blower by buying the manufacturers kit. The cable is on a large half moon pulley driven by a standard cylinder. As much as I like my blower, it was a royal pain to get the parts from Canada.