Source : Webster's Revised Unabridged Dictionary (1913)

Self-moving \Self`-mov"ing\, a.
   Moving by inherent power, without the aid of external
   impulse.

Source : WordNet®

self-moving
     adj : designed to activate or move or regulate itself; "a
           self-activating sprinkler system" [syn: {self-acting},
           {self-activating}, {self-regulating}]