The DC 8 be it a 60 or 70 series has a number of hydraulic subsytems that will function independently in case of failure of the main systems. I believe that that there are 8 such subsystems. But it is 7 years since I last flew the type. So you need to get hold of a manual.
Most items on the DC 8 are cable operated. There are levers in the cockpit for almost everything.
Quote " Works well and lasts a lifetime"