If there is a manual or any wiring info, it should say which wire is earth, live and neutral- looks like you guessed that part right.
Caps dont alter voltage though, they just store current and release it in bursts as and when required (high load situations).
Without knowing what this machine is or what voltage its designed to run off (again, in the manual or in the technical specs), its impossible to say how it needs to be wired up. You could need to buy a $$$$$ 3 phase power converter or transformer unit to power it, or it might just need the plug fitting.
RTM indeed...