import .fbx from cinema4d to unity4

hey everyone. I'm trying to import a simple "test"cube with an keyframe animation from cinema4d to unity, but, for some reason the animation won't work/play in my game. if i check the fbx file in the unity inspector, i can perfectly preview the animation, but after i drag & drop it into my "hierarchy"-field and press play - no animation is showing up in my game. do i miss something?