how to setup a hyrauilic excavator on a 6channel?

[cosworth34677]

ok i got a this flysky 9x the is giving me some problems. i dosen't seem to let the servo's go full throw left or right. i the hydraulic set i got is really big on the throw of the servo's. so i wan to use my futaba t6j raido but its a 6 channel no the 8 that the flysky is. but heres the thing i need a channel the will run the pump and mix it. the mangon set NEEDS to have the mixed it dosen't like to run all the time. i ate one of the pump gears already doing that. so how would yo set this up?